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1.Hello! I have a test tomorrow, and the questions and material will be about these topics. I am looking for ...

ng for step by step solutions and clear and detailed solutions to the problems.
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4.This is Electromagnetism course , from book Griffiths there are 2 problems of my home work... And this is the ...

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6.Scenario: A chair with a mass of 20.0 kg is attached to one end of a frictionless pulley system via a ...

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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Concrete Creation: 


Concrete comprises cement, fine and coarse particles with water that hardens with time. Concrete technology deals in the study of concrete and its properties with its application in building different construction such as beams, walls, slabs and columns. The different types of concrete with a mixture of other binding materials is used to construct various structures according to its strength, durability and endurance.


Concrete Creation Sample Questions:


Question 1: Which of the following is a mixture of cement, sand, pebbles and water, which when allowed to cure, becomes hard like a stone. 


a) Cement mortar              b) Cement slurry

c) Cement solution            d) Cement concrete 


Answer: d) Cement concrete 

Explanation: Cement concrete is a major building material in the construction of modern buildings.



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Question 2: ___________ method, where the voids of coarse and fine aggregate are determined separately. 


a) Maximum void              b) Minimum void

c) Optimum void              d) None of these 

Answer: b) Minimum voidt

Explanation: In the minimum void method, the quantity



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Question 3: Which of the following helps in increasing the strength of the concrete?


a) Increase in water-cement ratio                  b) Increase in fineness of cement

c) Decrease in water-cement ratio                 d) Decrease in fineness of cement 

Answer: b) Increase in fineness of cement

Explanation: The fineness of cement affects the quantity of water



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Question 4: The percentage of void in cement is approximately


a) 80%               b) 60%

c) 40%               d) 30%

Answer: c) 40%    

Explanation: The void percentage


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Question 5: What is the effect of adding calcium chloride in the concrete?


a) Increases shrinkage               b) Decreases setting time

c) Both (a) and (b)                  d) None of these 


Answer: c) Both (a) and (b)

Explanation: Calcium chloride accelerates the time of set and the rate of strength gain, which decreases the



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Question 6: The safety factor of steel is _________ than that of concrete.

a) higher              b) lower

c) same                d) none of these 

Answer: b) lower

Explanation:  The standard factor of safety for concrete is taken as 1.5. Concrete requires



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Question 7: The flexural strength of the concrete is directly proportional to _______.


a) square of compressive strength.                   b) square root of compressive strength.

c) cube root of compressive strength.               d) none of these.


Answer: b) square root of compressive strength.

Explanation: The flexural strength of the concrete



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Question 8: Lower compressive strength of concrete shows 


a) Lower modular ratio                     b) Higher modular ratio

c) Higher water-cement ratio           d) Lower water-cement ratio


Answer: b) Higher modular ratio

Explanation: Concrete and steel are combined as one material using the concept of modular ratio.



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Question 9: ________ wall is suitable for height beyond 6m.


a) L-shaped wall               b) T-shaped wall

c) Counterfort wall            d) None of these


Answer: c) Counterfort wall

Explanation: Counterfort walls have this vertical slab called counterfort, equally



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Question 10: Which of the following properties is possessed by cement concrete ?


a) Elastic               b) Flexible 

c) Porous              d) All of these


Answer: c) Porous

Explanation: Cement concrete contains voids which are formed during its placement. In order to prevent porosity, 



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