How would i calculate the size of this

ith the formulas to calculate these answers. my assignment is due soon would you please help

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.

k of 10 cards numbered 1-10. I draw 5 cards (each time i draw i put the card back and shuffle). The numbers were 8, 2, 4, 9, and 4. What is the probability that it will be 4 on the 6th time i draw? I know each card has a 10% chance of being drawn. I also know the probability of a 10% event happening twice is 1%. But wouldnt the odds be lower since i drew 4 a couple trials earlier? How exactly would i calculate that. If there is an online calculator that executes the answer id like to know. Just a college student who craves probability. :)

cific gravity) of 1.24. What is the molarity of this solution? Using this solution how would 1 L of 2N solution be made. 6 (5 points) H3BO3 is needed to neutralize 20 ML of a 2N solution of NaOH. How much of the acid should I put in 40 ML of the water to exactly neutralize this solution?   7 (6 points) Describe how to make the solutions below : 20% w/v Salt in water. 20% v/v alcohol in water 20% w/w NaCl in water. 8 (three points) I have 0.6 g/dl solution of NaOH. What is M? Whan is N? 9 (six points) There are 3000mL of 3M NaOH. How much of the following do I need to neutralize? (watch your M’s and N’s a) 3M H3PO4 b) 2M H2SO4 c) 1M HCL 10 (20 points) The following solutions of NaOH are mixed together 20ML of 3N, 40mL of 2N, 60mL of 1N, 80 mL of 4N, and 100mL of 5N. a) What is the volume and normality of the final solution? b) How much 4M sulfuric acid would I need to neutralize? c) How much stock solution of sulfuric acid with an assay of 77% and a specific gravity of 1.14 would I need? d) How many grams of HCl would I have to put in a 300mL solution of HCl in water to neutralize? 11 (3 points) How much 5N solution can I make with 98 grams of H3PO4 ? 12 (5 points) How much 5N solution of H3AsO4 can I make with 57 mL of stock solution that is 84% assay and 1.14 specific gravity? 13 (5 points) If we have a 4N solution of HCl that has 0.03645g of HCl in the solution, how many microliters of solution do we have? 14 (10 points) If we have 66mL of a solution of concentrated NaOH that has an assay of 88% and a specific gravity of 1.24, how much 3N H3AsO4 can be neutralized?   15 (ten points) If I have 17 mL of a 20% w/v solution of NaOH and I want to neutralize with H2SO4 that is available in a 4% w/v solution, how much of this solution will be required. 16 (ten points) a) I have an 12mL of Ba(Cl)2 that is 78% assay that contains 8 grams of Ba(Cl)2. What is the specific gravity? b) How many Moles of Ba(Cl)2 are there? c) If I have 80 grams of NaOH in a liter of solution that is of an unknown specific gravity, can I calculate molarity and what is it? d) What is the difference between molarity and normality? e) I have 77 ml of 77% salt in water. How much 11% can I make?