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f 0.0124 J. The
object collides with a horizontal spring and compresses it by 0.800 m before it is brought to rest momentarily. What
is the spring constant of this spring? When the spring was compressed to 0.800 m, is the work done on the mass
m1 by the spring positive, zero, or negative?

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in 98.70 s. Under the same conditions, 1.738 mol of another gas with molar mass 40.10 g mol-1 takes 82.60 s to effuse. What is the molar mass of yorksinite? Report your answer to one decimal place. Do not enter units.

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a strong massless rope. The other end of the rope is attached to a steel water tank sitting on a flat horizontal concrete surface (see the image to the right). The coefficient of static friction between steel and concrete is 0.45 and the coefficient of kinetic friction between the surfaces is 0.30. The water tank, which is full of water, has sprung a leak. The combined mass of the water and the tank is 500 kg. This mass slowly decreases as the water leaks from the hole. You (i.e. your entire mass) are sitting at rest in the seat. You and the seat will remain at rest as long as the force of static friction is strong enough to hold you.
Task:
LET [DOWN] and [RIGHT] be positive. Using your knowledge of physics, determine the following:
Draw the FBD of the system of you and the chair while at rest. Using the LET statement above, write out the net force equation. [2]
Draw the FBD of the system of the water tank at rest on the flat horizontal surface. Using the LET statement above, write out the net force equations for both the vertical and horizontal planes. [3]
Using the net force equations, determine the minimum mass of water that must be lost (i.e. leaked out) from the water tank in order for you and the seat to begin falling? [4]
As soon as the chair begins to move, static friction between the steel tank and concrete surface becomes kinetic friction. Determine the magnitude of the kinetic friction. [3]
Using Newton’s 2nd law, determine the acceleration of the system at the instant that the static friction becomes kinetic friction. [6]

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4.The man in the figure at left has a mass of 50 kg, and launches horizontally from a trapeze at ...

m/s. After landing on the trampoline, which has a “spring” constant of 17 kN/m, the trampoline deflects downward 0.7 m, and the man bounces up and to the left.
a) How much farther to the left does he travel after bouncing off the trampoline?
b) What is the maximum height he will reach after the bounce?
c) What will his velocity be upon landing?

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5.4. A 2.3 L cylinder containing nitrogen gas at a pressure of 2.8 atm is connected to a 5.5 L ...

r containing nitrogen at 17.3 atm. What is the final pressure when both the cylinders have achieved equilibrium (reached the same pressure)?
6. An analytical procedure requires a solution of chloride ions. How many grams of BaCl2 must be dissolved to make 360 ml of 0.2 M Cl– ?
(M BaCl2 = 208 g/mol)
7. Find the concentration of chloride ions when 344.4 mL of 2.4 M NaCl is mixed with 364 mL of 2.9 M KCl?
8. A sample of an unknown gas had a density of 1.45 g/L at 20.5 °C and 1.2 atm. Calculate the molar mass of the gas.
(R = 0.08206 L·atm·mol-1·K-1)

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quid with a “sweet” smell.
i. Using the ground state electron configuration and excited state electron
configuration explain the hybridization of the central Carbon (C) atom. (7 Marks)
ii. Identify the orbitals that overlap to form the C-Cl bond. Draw a diagram to show
the orbital overlap. (3 Marks)
iii. What is the bond angle of CCl4? (1 Mark)
b) Consider a Fluorine atom (F) and a Fluorine anion (F-). Which of these two species would
you expect to have a larger radius? Explain your answer. (5 Marks)
c) Explain why the first ionization energy of Aluminum (Al) is less than that of Magnesium
(Mg). (4 Marks)
d) Assume the atom Oxygen(O) can form both cationic(O+) and anionic(O-) species. Place
the following species in order of increasing first ionization energy, starting with the lowest.
O+, O, O-
(5 Marks)
4.
a) Sea water contains roughly 28.0 g of NaCl per liter. (NaCl molar mass = 58.44 gmol-1).
i. Calculate the number of moles of NaCl in a liter of sea water. (2 Marks)
ii. Calculate the molarity of NaCl in sea water. (4 Marks)
iii. Calculate the mass by volume percent (W/V) of NaCl in sea water. (4 Marks)
Lowest first
ionization energy
…………………
…..
Intermediate
ionization energy
…………………
…..
Highest first
ionization energy
…………………

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7. 23.0 mL of water are put in a graduated cylinder. The cylinder with the water in it has a mass ...

144.7 g. The dry, empty cylinder has a mass of 121.2 g

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ing to figure this out I need help

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9.Q1) (15 points) In the diagram below, M1 = 50 Kg, M2 = 20 Kg, mass and radius of the ...

g and 30 cm each, respectively. Both M1 and M2 rest on frictionless surfaces and the system starts from rest.
(a) Draw the fbd for each of M1, M2 and the pulley.
(b) Write the equations of motion for each of M1, M2 and the pulley.
(c) Calculate the linear acceleration of the two masses, as well as the angular acceleration of the pulley.
(d) Calculate the angular velocity of the pulley after M1 and M2 have been displaced linearly by 2 m.
Q2) (10 points) A basketball is thrown with an initial speed v0 of 10.8 m/s at 400 above horizontal, and it enters the hoop from above. The ball is released at 2.00 m above the ground. The hoop is 3.05 m above the ground and 10.0 m away from the player.
(a) Find the time at which the ball passes through the hoop.
(b) Find the ball’s velocity (express in component form) just when it enters the hoop.
(c) Find the ball’s maximum height.
Q3) (5 Points) An object is thrown up from the top of a building of height of 400 m with an initial velocity of 20 m/s.
(a) Find the position and the velocity of the object 5 s later.
(b) With what velocity will it hit the ground?
(c) At the same time the first object is thrown up, a second object is thrown up from the ground at 100 m/s. Will the two objects collide? If yes, calculate when and where,

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s 5m long. The student on the left weighs 60kg and is sitting three meters away from the fulcrum at the center. The student on the right weighs 45kg. The seesaw is parallel to the ground. The mass of the board is evenly distributed so that its center of mass is over the fulcrum. What distance from the center should the student on the right be if they want the seesaw to stay parallel to the ground?
a. 4m
b. 5m
c. 2m
d. 3m

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12.A mass of 250 g is hung on a spring. This causes the length of the spring to increase from ...

135 mm.
What is the frequency of the subsequent vibrations, in Hz?

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13.A 200.0 MeV photon is absorbed by a particle of ...

x.(a.) What is the mass (rest energy) of the particle after the collision in MeV? (b.) Show numerically that the gain in rest energy is equal to the photon’s energyminus the particle’s kinetic energy after the collision.

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15.A bead of mass m can slide frictionlessly along a rod. The bead is attached to one end of a ...

ith spring constant k. The rod and other end of the spring are attached to another rod (length b) at a 90◦ angle, which rotates counterclockwise in vertical circles with constant angular velocity ω. Both rods and the spring are massless, and all motion is confined to a plane.

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16.A bead of mass m can slide frictionlessly along a rod. The bead is attached to one end of a spring ...

with spring constant k. The rod and other end of the spring are
attached to another rod (length b) at a 90◦ angle, which rotates counterclockwise in
vertical circles with constant angular velocity ω. Both rods and the spring are massless,
and all motion is confined to a plane.

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18.A diving board of neglible mass and length 3.0m is hinged at its left end and rests on top of ...

ort a distance d= 0.4 m away from the left end. A person of mass 61 kg stands at rest at the right end. What is the magnitude of the force provided by the hinge?

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B with mass 2m orbits the Earth at a distance r from the center of the planet.
Is the orbital period of Satellite A less than, equal to, or greater than the orbital period of Satellite B? Explain, using equation(s) if needed to support your answer. A correct answer with no explanation will receive no credit.

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20.A rock weighs 105 N on the surface of planet X with gx= 21.2 ms2 . What is the weight ...

the surface of planet Y, which has 29 times the mass and 3.6 times the radius of planet X?

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21.A spacecraft with mass 2100 kg is moving away from a planet of mass 7.7×1023 kg . At a distance ...

×107 m away from the center of the planet, the spacecraft has speed 3700 ms . Defining the edge of the universe as the origin for calculations of gravitational potential energy, what is the total energy (kinetic and potential) of the spacecraft?

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o accelerate her to 7.9 m/s ^2 in Newtons

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humidity of this air mass (expressed as a percentage)? Round your answer to the nearest tenth of a percent

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24.I need to do a household experiment in which I need to calculate the torsion constant of a string. I ...

have a string hanging with a mass at the bottom and I need to take a video from under the setup and track the angle of twist using tracking software. How would I go about actually calculating the torsional constant.

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ction between the floor and book is µk. Using the information given in the figure:
(a) draw free body diagrams for both the books, and also for the combined system (of mass m1+m2),
(b) find acceleration of the books along horizontal direction, and
(c) find the magnitude and direction of the force exerted by the left book on the right book.
3.A car of mass 1500-kg enters a circular path at point P and leaves at point Q (see the figure) at constant speed of 5.0m/s, and the frictional force acting on its tires is 2500-N.
a) how long it takes to reach point Q from point P, and
b) what should be the minimum value of the coefficient of static friction between the tires and the road?
4)In an elevator which is accelerating downward at 2.5ms−2 , a 25-kg block hangs from a spring attached to the ceiling of the elevator. If spring gets stretched by 0.15m, find its spring constant.

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26.In 1899, Charles M. “Mile a Minute” Murphy set a record for speed on a bicycle by pedaling for a ...

mile at an average of 62.3 mi/h (27.8 m/s) on a track of planks set over railroad ties in the draft of a Long Island Railroad train. In 1985, a record was set for this type of “motor pacing” by Olympic cyclist John Howard who pedaled at 152.2 mi/h (68.04 m/s) in the wake of a race car at Bonneville Salt Flats. The race car had a modified tail assembly designed to reduce the air drag on the cyclist. Assume that the mass of bicycle plus rider is 72.3 kg in each case.

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a) A scientific theory must be able to be proven.
b) A scientific theory has been derived from known facts and always applies.
c) A scientific method should give different results depending on who performs the method.
d) Knowledge of our surroundings usually emerges through an interplay between theory and experiment.
2) The sides of a straight block are measured to 3,202 cm; 0.0012 cm and 11.2 cm, respectively. Calculate the volume of the straightening block and enter it with the correct number of value digits.
(2/0/0)
Number of words: 0
3) A 9.2 dm long and evenly thick rod rests on a support. 0.55 dm from one end, a dynamometer is hung so that the rod will hang horizontally. Then the dynamometer shows 4.4 N. How much does the bar weigh?
(1/1/0)
Number of words: 0
4) A bar AB that is homogeneous and evenly thick has a length of 2.70 m and is rotatable about an axis at A. The bar weighs 25 kg and is kept in equilibrium by a force F which has its point of attack in B. is 45 degrees. How big is the force F?
(1/1/0)
Saved!
25 * 9.82 = 245.5 N
Number of words: 6
5) A trolley rolls at a constant speed to the right. On the cart is an upward cannon that suddenly shoots a bullet. The carriage continues to the right with the same speed as before. Where does the bullet end up when it falls? For a detailed reasoning.
(1/1/1)
Number of words: 0
6) A river is 200 m wide. The water in the river flows at a speed of 2.5 m / s. A motorboat steers across the river at its maximum speed, which in stagnant water is 5.0 m / s. The boat is constantly heading perpendicular to the banks of the river. Where does the motorboat land on the other shore?
(2/0/0)
Number of words: 0
7) A ball with a mass of 2.0 hg moves at a constant speed in a circular path. The radius of the track is 1.5 m and it takes the ball 3.0 seconds to move one turn. How big is the centripetal force?
(1/1/0)
Number of words: 0
8) A bullet moves at a constant speed. Can we then safely say that the resultant of the forces acting on the bullet is zero? Motivate and discuss your answer.
(0/1/1)
Number of words: 0
9) A conductor is located between the poles of a permanent magnet. The current in the conductor goes in the direction of the plane of the paper (away from the reader). How is the force acting on the leader directed?
(1/0/0)
a) To the right of the figure
b) To the left in the figure
c) Downwards in the figure
d) Upwards in the figure
10) Protons enter horizontally from the left between two large metal plates at a speed v = 0.80 Mm / s. The plates are connected to a voltage source with the pole voltage U. Between the plates there is a homogeneous magnetic field with a flux density of 38 mT directed perpendicular to the plane of the paper. The distance between the plates is 1.5 cm. They want the protons to continue with unchanged direction and speed between the plates. Which of the plates should be connected to the positive pole of the voltage source and how large should the voltage U be?
(0/2/0)
Number of words: 0
11) The magnetic flux Φ through a 700-speed coil decreases linearly with time according to the diagram below. Calculate the voltage across the coil at time t = 1.0 ms.
12) The current in a coil with an inductance of 35 mH has a growth rate of 6.2 A / s at a given moment. What is the instantaneous value of the ems induced in the coil?

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hin a free demo session as I have my answers, but just want to confirm them, that would be greatly appreciated.
Question 1:
A block of mass M = 0.10 kg is attached to one end of a spring with spring constant k = 100 N/m . The other end of the spring is attached to a fixed wall. The block is pushed against the spring, compressing it a distance x = 0.04 m . The block is then released from rest, and the block-spring system travels along a horizontal, rough track. Data collected from a motion detector are used to create a graph of the kinetic energy K and spring potential energy Us of the system as a function of the block's position as the spring expands. How can the student determine the amount of mechanical energy dissipated by friction as the spring expanded to its natural spring length?
Question 2:
The Atwood’s machine shown consists of two blocks connected by a light string that passes over a pulley of negligible mass and negligible friction. The blocks are released from rest, and m2 is greater than m1. Assume that the reference line of zero gravitational potential energy is the floor. Which of the following best represents the total gravitational potential energy U and total kinetic energy K of the block-block-Earth system as a function of the height h of block m1?
Question 3:
A 2 kg block is placed at the top of an incline and released from rest near Earth’s surface and unknown distance H above the ground. The angle θ between the ground and the incline is also unknown. Frictional forces between the block and the incline are considered to be negligible. The block eventually slides to the bottom of the incline after 0.75 s. The block’s velocity v as a function of time t is shown in the graph starting from the instant it is released. How could a student use the graph to determine the total energy of the block-Earth system?
Question 4:
A block slides across a flat, horizontal surface to the right. For each choice, the arrows represent velocity vectors of the block at successive intervals of time. Which of the following diagrams represents the situation in which the block loses kinetic energy?

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29.When 15.0 mL of 3.00 M NaOH was mixed in a calorimeter with 13.0 mL of 3.00 M HCl, both ...

room temperature (22.0 °C), the temperature increased to 29.1 °C. The resultant salt solution had a mass of 18.00 g and a specific heat capacity of 3.74 J K-1 g-1. What is the heat capacity of the calorimeter (in J/°C)?
Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ mol-1.

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cylinder has a mass of 42.434 g. When it is filled with water, it weighs 56.878g. What is the mass of the water.

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31.A block of mass m1 lies on the horizontal plane, and another block of mass m2 is on it. A ...

thrown through the system of pulleys shown in the figure. A load of mass M = m1 + m2 is suspended from the movable pulley. At what ratio between the masses m1 and m2 will the blocks not slide over each other if the coefficient of friction between the blocks is µ, and there is no friction between the lower block and the plane? The mass of the thread and pulleys, as well as the friction in the pulleys, should be neglected; the thread is considered unstretchable.

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32.You are boiling water on the stove, in order to cook pasta. You need to heat 1.2 kg of water ...

e room temperature of 25°C to the boiling point of water, which is 100°C.
However, the stainless steel pot that the water is in will also heat up from 25°C to 100°C. This pot has a mass of 2 kg.
The specific heat of water is 4181 Joules/kg - °C and the specific heat of stainless steel is 502 Joules/kg - °C.
How much heat does the stove need to apply solely to the combination of the pot and the water in joules?

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33.Person A and person B is carrying a sheet with bricks on it the bricks mass is 40 kg and ...

nter is 1.5 m away from person A (the sheet's mass is 10 kg and it is 7.6 m long )
If person B is 2m away from on side of the sheet while person A is 1 m away from the other side .
Calculate the force that person A & person B effects the sheet with
A. PerA 189.5N ,PerB 300.5N
B. PerA 189.5N ,PerB 679.5N
C. PerA 68.2N ,PerB 300.5N

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units.
Chemical Equation: Write a generic chemical equation for the dehydration of cobalt (II) chloride ∙ x hydrate (include the state symbols of the reactant and two products). [T2]
Mass of Reactants and Products:
a) Calculate the initial mass of the hydrated cobalt (II) chloride. [T1]
b) Calculate the final mass of the anhydrous cobalt (II) chloride remaining in the cruiio8icible. [T1]
c) Calculate the mass of water given off by the sample of hydrated cobalt (II) chloride. [T1]
Moles of Products:
a) Calculate the moles of anhydrous cobalt (II) chloride remaining in the crucible. [T1]
b) Calculate the moles of water released from the hydrate. {T1]
4. Mole Ratio
a) Create an experimental mole ratio between the b) and a). [T1]
5. Formula of Hydrate: State the chemical formula you have determined for this hydrate.
Round the formula to the closest whole number value for x. [T1]
Discussion/Conclusion Questions: [T6]
Based on the chemical formula of the hydrate, calculate the percentage composition (percent by mass) of the hydrated cobalt (II) chloride. Remember to determine the percentage of each element (Co, Cl, H, and O). [T2]
A possible source of systematic error in this experiment is insufficient heating. Suppose that the hydrate was not completely converted to the anhydrous form. Describe how this would affect: the calculated percent by mass of water and the experimental molecular formula (i.e. would x be higher, lower or the same).
Suppose a student spilled some of the hydrated cobalt (II) chloride. Describe how this would affect the calculated percent by mass of water (would it be higher, lower or the same) and the experimental chemical formula of the hydrate. [T2]

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35.Two people objects are moving downward at a speed of 3 cm/s. Object A has a mass of 2 kg ...

B has a mass of 1 kg. You want both objects to move to the left at a speed of 3 cm/s.
1. In what direction (or directions) should you exert the forces that will make the desired change?

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. A person of mass 50 kg is hanging from the board. When the board and person are accelerating downward at 1.0 m/s2, the tension in the right chain is 250 N. What is the tension in the left chain?

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of CoCl2 . H2O. The hydrate became anhydrous through this.
Suppose a student spilled some of the hydrated cobalt (II) chloride. Describe how this would affect the calculated percent by mass of water (would it be higher, lower or the same) and the experimental chemical formula of the hydrate. [T2]
A possible source of systematic error in this experiment is insufficient heating. Suppose that the hydrate was not completely converted to the anhydrous form. Describe how this would affect: the calculated percent by mass of water and the experimental molecular formula (i.e. would x be higher, lower or the same).

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38.A sphere of mass M = 20kg and radius R = 10cm has its mass distributed in a way where ...

mediately guess it’s moment of inertia. To investigate whether it behaves more like a solid sphere or hollow sphere, you roll it down a rough ramp inclined at an angle of 30° with respect to the horizontal. The sphere rolls without slipping and you measure the velocity of the center of mass to be 3 m/s as it leaves the bottom of the ramp. The ramp’s length is 2 m and you release the sphere from the top of the ramp, a height of 1 m.
a) What is the moment of inertia of the sphere?
b) What is the angular speed of the sphere as it reaches the bottom of the ramp?
c) What is the frictional force on the sphere?

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perfectly elastic collision with a block of mass M at rest. After the collision, the 9.00 kg block recoils with a speed of 0.400 m/s. In the diagram below, the blocks remain in contact for 0.18 seconds. Find the magnitude of the average force ( in Newtons) exerted on the 9.00 -kg block, while the two blocks are in contact.

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k of mass 100 m that is resting on a table with negligible friction. The top of the table is a distance h above the floor. After the collision, the projectile and the block fly off the table and land a distance x from the base of the table. Express all answers in terms of m, h, Vo, and appropriate constants:
a. The velocity of the projectile and block as they leave the table.
b. The distance x
Suppose that the projectile passes through the block instead of being trapped in it.
c. Will the time required for the block to reach the floor from the edge of the table now be greater than, less than, or the same as before? Justify your answer.
d. Will the distance x for the block be greater than, less than, or the same as before? Justify your answer.

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motionless puck as shown on the picture above. The net force that the stick applies on the puck is 150N and the contact lasts for 7.5 ms. The mass of the puck is 166 g.
A) (1 point) Calculate the acceleration of the puck under the influence of the net force.
B) (2 points) Calculate the puck's change in momentum due to the impulse applied by the hockey stick.
C) (1 point) What is the velocity of the puck once it leaves the stick?
Puck travels over rough ice and comes to a stop after 25 m. The force diagram below shows all forces acting on the puck during that travel.
Screen Shot 2020-11-02 at 2.04.05 PM.png
D) (1 point) Calculate the work done on the puck by gravitational force.
E) (1 point) Calculate the work done on the puck by normal force.
F) (2 points) Calculate work done by friction force on the puck.
CNX_UPhysics_09_03_HockeyPuck.jpg
Now stationary, the puck (red) collides with a blue puck of the mass .332 kg moving to the left with velocity of 2.5 m/s. If collision is perfectly elastic calculate:
H) (2 points) Total momentum of blue+red puck system before collision?
I) (1 point) What is the total momentum of blue+red puck system after collision? How do you know?
J) (2 points) What is the velocity of the blue puck after collision?

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and 15.07 grams of CO2 and 6.170 grams of H2O are produced.
In a separate experiment, the molar mass is found to be 74.08 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

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43.A 5kg mass is pushed by 2 forces horizontally( one 10N to the rigtht at a 53 degree, and the ...

n 4N to the left), and 1 vertical force(6N downwards).
Determine the net vertical force
Determine the magnitude and direction of the net force
Determine the acceleration of the mass

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has a mass of 4.10 kg. Using the information provided, what is the density of glycerol ?
g/mL (2 decimal places, i.e. number.XX

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on the chair with a force F = 40.0 N that is directed at an angle of 43.0 ∘ below the horizontal and the chair slides along the floor

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46.hi, i wanted to know how do they calculate how many grams are in 1 amu, i know they say ...

of carbon has the mass of 12 grams and we know a carbon atom is 12 amu heavy so we can calcualte it, but i don't understand how do they know how much 1 mole of carbon weighs.

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kg.
The plane has the capacity to carry 120 passengers, and
when there are 40 passengers on the plane, the total mass of
the plane and passengers is 7480kg.
a) Calculate the mean mass of a passenger.
b) Hence, write an expression for nu that gives the total
mass of the plane and passengers when there
are n passengers on board.
c) State the values of n for which your model is valid.

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34.0 N when it’s not in the water. When it’s submerged in water (the density of water is
1.00 x 103 kg/m3) the scale now reads 27.0 N. (a) What is the density of the block? (b) If you
suspended another object from the block that has a density of 3.20 x 103 kg/m3, with both objects
submerged, what would the object's mass need to be for the scale to once again read 34.0 N?
Note: Part (a) is worth 7 points, and part (b) is worth 8 points.

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m/s and hits a second bowling ball mass m2 that is stationary. After the collision the velocity of m1 is -2m/s. Assume that the collision is elastic.
A. 2m1 = 5m2
B. 7m1 = 3m2
C. m1 = m2
D. 5m1 = 2m2

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×10-4 T magnetic field, it moves in a circular path of 0.4 m radius, what is the speed of that electron. ge to mass ratio of the electron equal

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52.An elevator WEIGHS 1.0 x 10⁴ N. {Part A} Draw a free body diagram for each part of this questions ...

to show which force is larger [5 marks] {Part B} Determine the MASS of the elevator [2 marks] {Part C} The elevator begins to accelerate UPWARDS from rest at 5.0 m/s². What is the force tension in the cable? [3 marks] {Part D} The same elevator is moving UPWARDS and starts to DECELERATE at 3.0 m/s². What is the force tension in the cable? [3 marks] {Part E} The elevator moves DOWN at CONSTANT velocity at 10 m/s. What is the force tension in the cable? [2 marks] {Part F} The elevator cable snaps (and everyone screams!). What are the forces working on the elevator now? Draw a diagram [2 marks]

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llected;
Chemical equation: Zn(s) + 2HCl(aq) = H2(g) + ZnCl2(aq)
Initial mass of zinc: 3.1g
Initial mass of hydrochloric acid: 45.6g
Final mass of solution: 49.8g
a) Calculate the mass of hydrogen produced
b) Do the results of this experiment violate the law of conservation of mass? Explain

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llected;
chemical equation: Zn(s) + 2HCl(aq) = H2(g) + ZnCl2(aq)
initial mass of zinc: 3.1g
initial mass of hydrochloric acid: 45.6g
final mass of solution: 49.8g

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s. What pressure does the person exert on the groumd of standing on both legs

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57.The situation shown in the figure, all surface are friction less, Blocks A and C each of mass 5 kg ...

re connected through a light string passing over smooth pulleys fixed in a truncated triangular block B of mass 5 kg. the system is released from rest. Choose the correct options.

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entahydrate. My students are varying either the mass of the copper oxide or the concentration of the sulfuric acid. They do not have an understanding of any chemistry calculations and only basic knowledge about chemical equations. They should have some knowledge of ionic equations and neutralistions reactions but I need to explain it to them in very basic terms. Without doing any calculations myself I can't explain it to them.

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59.Two children of mass 18 kg and 29 kg sit balanced on a seesaw with the pivot point located at ...

nter of the seesaw. If the children are separated by a distance of 5 m, at what distance from the pivot point is the small child sitting in order to maintain the balance?

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nsist of true/false and/or multiple choice questions. You may use ONE page (8.5x11 inches) of handwritten notes on both sides.
Study the following terms and concepts as they are discussed in your assigned readings and course material. You should be able to identify, describe, and/or discuss the themes and/or approaches to justice. Don't just look for definitions, aim for understanding. Happy studying!
Immigration
How has immigration changed since the early 1800’s?
What is Friendship Park and how has it changed over the years?
Know the common question responses and myths and facts about immigrants and immigration.
Review readings from RDSJ; p. 102-109; from the reading, Injustice for All, what factors are contributing to the rise of an immigration policing regime in the U.S.? How does this impact the lives of undocumented immigrants, like Fatima?
In the film, what is the experience like for undocumented (and documented) immigrants held at the detention center featured in the film?
Terrorism
What percent of terrorist acts are committed by U.S. citizens?
What are the beliefs of the Christian Identity movement?
Though most reject the ideology of The Christian Identity movement, it is still popular because...?
What are the emerging trends in terms of domestic terrorism?
What is the difference between the uniform crime report and national crime victimization survey?
Contemporary Slavery
Know the forms of slavery in modern America.
Causes of modern slavery, why it persists, and how is it different from the past.
Know the major types of slavery in the world today.
Environment
Relationship between the U.S., natural resources, and world population
Describe the world’s supply of freshwater and how it is used, also in the U.S.
What is the relationship between water, food, health, manufacturing, and war? How many gallons of water for one pair of jeans?
How might privatizing water supplies impact society?
How might water impact tensions between countries?
The New Jim Crow (Alexander); Ch. 4-6
What is colorblindness? What should replace colorblindness?
Describe mass incarceration. Essentially, how does it operate?
What does the movement to end mass incarceration need to cultivate?
Describe the impact of The Quality Housing and Work Responsibility Act.
How did drunk driving laws compare to drug laws?
How did the white unemployment rate compare to the black unemployment rate in the early to mid 1980's?
With Affirmative Action, describe the unemployment rate in black communities.
What explains the high rates of violent crime in black communities?

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lar mass -KMnO4 = 158 g/mol) used in titration of 100 mL raw-water sample diluted 1:20 was 9,2 mL. Calculate the orientative amount of Fe(III)-sulfate coagulant needed to be added to 600mL of water sample in a coagulation-flocculation experiment.

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62.The mass of a wheel is 5 kg and its radius of duration is 0.25 m. What is its moment ...

produce an acceleration of 4 rad s^-1 what amount of torque is required to apply on it?

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ed and the car decelerates to 10ms-¹. How much kinetic energy is lost by the car

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if Mass of a book =0. 5kg

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cannot convert the measurement to a whole number as the calculator says it is 8.552356e+37(kg). Can you please help me find the whole number without exponents, it's for an urgent project.

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n warp engine nacelle. He finds he has drifted away from the shuttle while carelessly daydreaming. Miraculously, a stray photon torpedo casing (mass 2,220 kg) appears. Wharf uses this casing to get back to the shuttle by pushing against the casing. If the casing moves directly away from the shuttle after this push with a speed 0.2 m/s, and it then takes him 4 seconds to reach the shuttle again, how far away was he from the shuttle, in m?

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L⃗ relative to the origin when the particle is at r⃗ =(2.5j^+4.3k^)m. At position r⃗ a force of F⃗ =4.1Ni^ is applied to the particle. Find the torque relative to the origin.

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a mass of 15.0kg, leave Cap’s hand at 9.37 m/s. If Captain America has a mass of 99.8kg, at what velocity does Captain America travel at after the throw? Indicate direction with sign where to the right is the positive direction.

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69.i have a crystal ball with a density of 4.36grams for every cm^3. if the crystal ball has a mass ...

10.75 kg, what would be the diameter of the crystal ball?

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70.Hi! I need help with part (c) of this question. I have already done part (a) & (b): A recent poll ...

conducted by Gallup Inc. asked the following question:
In general, how much trust and confidence to you have in the mass media - such as newspapers, TV, and radio - when it comes to reporting the news fully, accurately, and fairly? A great deal, a fair amount, not very much, or non at all?
53% of respondents has a negative view of the media, meaning they responded with either not very much or non at all.
Two people are randomly chosen, each is asked the poll question above. What is the probability
Part (a) that both have a negative view of mass media? 0.53^2
Part (b) neither have a negative view of the mass media? 0.47^2
Part (c) at least one of the two has a negative view towards the media? .53 (<- wrong)

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a proton which stays in the nucleus and an electron which escapes from the nucleus. What new element is formed about what’s the atomic number and the mass number?

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72.1) A hypothetical element exists as two isotopes: I = 42.00 amu and II = 49.00 amu. If the percent ...

bundance of isotope I is (1.94x10^1)%, what would be the calculated atomic mass (in amu)?
2) A hypothetical element exists as two isotopes: I = 78.00 amu and II = 84.00 amu. If the atomic mass of this element is found to be 80.33 amu, which isotope must be more abundant?
3) If the hypothetical polyatomic ion ThOM2- is called "thomite", what would be the formula and name of the acid formed by this ion?
4) How many atoms of hydrogen are there in a sample of (4.00x10^2) grams of NH3(g)?
5) How many O (oxygen) atoms are there in (6.40x10^2) grams of H3PO4?
6) How many moles of fluorine atoms are there in (5.80x10^2) grams of SF4?
7) When 3.50 g of titanium (Ti) reacts with oxygen, the resulting oxide compound weighs 5.84 g. What is the empirical formula of this oxide?
8) How many moles of molecules are there in (6.70x10^2) grams of CH4?
9) A chemical is found to be 80.0% C and the rest is H. If the molar mass of this chemical is known to be 90.2 g/mol, what is the molecular formula?

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izontal. Its upper
end is connected to a wall by
a rope, and its lower end rests
on a rough, horizontal sur-
face. The coefficient of static
friction between the beam
and surface is ms. Assume
the angle u is such that the static friction force is at its
maximum value. (a) Draw a force diagram for the beam.
(b) Using the condition of rotational equilibrium,
find an expression for the tension T in the rope in
terms of m, g, and u. (c) Using the condition of trans-
lational equilibrium, find a second expression for T in
terms of ms, m, and g. (d) Using the results from parts
(a) through (c), obtain an expression for ms
L
u
Figure P12.16
Q/C
S
vertical component of this force. Now solve the same
problem from the force diagram from part (a) by com-
puting torques around the junction between the cable
and the beam at the right-hand end of the beam. Find
(e) the vertical component of the force exerted by the
pole on the beam, (f) the tension in the cable, and
(g) the horizontal component of the force exerted
by the pole on the beam. (h) Compare the solution
to parts (b) through (d) with the solution to parts
(e) through (g). Is either solution more accurate?
19. Sir Lost-a-Lot dons his armor and sets out from the
castle on his trusty steed (Fig. P12.19). Usually, the
drawbridge is lowered to a horizontal position so that
the end of the bridge rests on the stone ledge. Unfor-
tunately, Lost-a-Lot’s
squire didn’t lower the draw-
involv-
ing only the angle u. (e) What happens if the ladder
is lifted upward and its base is placed back on the
ground slightly to the left of its position in Figure
P12.16? Explain.

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75.A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ...

∘C is placed in the water. If the final temperature of the system is 21.40 ∘C , what is the mass of the steel bar?
specific heat of water = 4.18 J/(g⋅∘C)
specific heat of steel = 0.452 J/(g⋅∘C)

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76.. A uniform cylinder of mass M and radius R is initially at rest on a rough horizontal surface. A ...

ght string is wrapped around the cylinder and is pulled straight up with a force T whose magnitude is 0.8 Mg. As a result, the cylinder slips and accelerates horizontally. The moment of
inertia of the cylinder is I = 12 MR2 and the coefficient of kinetic friction is 0.4.
a. On the diagram above show all the forces applied on the cylinder. b. Determine the linear acceleration a of the center of the cylinder. c. Determine the angular acceleration α of the cylinder.
d. Explain the difference in results of linear acceleration a and αR.

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he
mining ship has a mass of 10,000 kg. The first rocket stage provides a thrust of 80 kN and is used over a
distance of 100,000 km. The second rocket stage provides a thrust of 40 kN and is used over a distance
of 200,000 km. The third rocket stage provides a thrust of 30 kN and is used over a distance of 400,000
km.
1) Calculate the final velocity of the rocket using two methods:
a. Using the work-energy theorem.
b. Using kinematics and Newton’s laws of motion. Hint: You might need to use the
quadratic formula to solve for t:
2) Calculate the total amount of time it takes for the mining ship to reach the other asteroid.
3) If the ship has a reverse thruster that provides 200 kN of thrust, how many km before reaching
the destination should the mining ship engage the reverse thrusters?

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ness, the dry salt residue has a mass of 2.00g

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79.i have alot of quetions and i have a test tmrw i need help learning it. one of ...

nd the alomic mass for b if 19.9% of b atoms are 10b with a mass of 10.0129371 amu and 80.1% are 11b with a mass of 11.0093055

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e of the largest gun manufacturers in the United States, experienced a 48.5 percent decrease in firearms revenue this quarter compared with the same time last year, The Guardian reports. Sales fell $100 million as a result of what has been called the "Trump slump."
The political climate has influence over gun sales. The expectation of many Americans that Hillary Clinton, the vocal pro-gun-control candidate, was going to win the presidential election in November is considered largely responsible for last year's surge.
People buy firearms at the highest rates when they fear regulations will be enhanced. The mass shooting at an Orlando nightclub shooting in June of 2016 also spurred record sales. According to the FBI's National Instant Criminal Background Check System (NICS), over 27.5 million firearm background checks for gun transactions were processed in 2016. That was over 4 million more than the previous year, and double the number of transactions in 2008."
Based on this article which of the following is true about the supply and demand of guns from 2016 to 2017
A)There was a decrease in demand for guns, and a decrease in the quantity supplied of guns
B)There was a decrease in quantity demanded, and a decrease in quantity supplied of guns
C)There was a decrease in the supply and guns and a decrease in the quantity demanded for guns.
D)There was a decrease in supply and a decrease in demand for guns.

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, What would be the predicted concentration of HCB due to bioconcentration in the fat of fish that swim in water containing 0.00006 ppm of the chemical?
2. The fat content of breast milk averages a little over 4.0 g per 100 ml. Calculate the mass of DDE that would have been ingested by a typical breast-fed infant in 1972 consuming 300 ml of breast milk per feeding, if the milk contained about 500 ppb of DDE in its fat content.
3. The PCB concentration in Lake Michigan is declining according to a first-order rate law having a rate constant of 0.078 year-1. If the PCB concentration in the lake averaged 0.057 ppt (parts per trillion) in 1994, what was the concentration in 2004? In what year will the concentration fall to 0.005 ppt.

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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

mathematicsalgebra Physics