URGENT NEED PHYSICS HELP PLEASE!?

HELP ME WITH physics questions please!!

1. To leap and clear a 200 m building Superman jumps to a height of 215 m. Neglecting Air resistance

a) Consider just potential and kinetic energy to determine Superman’s initial vertical velocity be in order to reach 215 m?

b) Use the same considerations to determine Superman’s vertical velocity at 200 m?



2. How much room is needed to stop car travelling at initial velocity vi of 60km/hr, assume the kinetic coefficient of friction between tyres and road, ?k, is 0.5 (car is skidding)? HINT: Consider change in kinetic energy and work done in stopping.



3.Adult chimpanzees have muscle mass of only about 1 /3 of an adult human male, but it has been shown to be over twice as strong in some movements. Can you account for this?



4. An electric fan is rotating about a fixed axis with an initial angular velocity of 0.220 rev/s. The angular acceleration is 0.920 rev/s2. Its blades form a circle of diameter 0.730 m. After 0.2 seconds has passed;

a) What is the angular velocity?

b) How many revolution has the blade turned?

c) What is the tangential speed v(t) of the tip of the blade?



5. What is the maximum tension possible in a 1.00-mm-diameter nylon tennis racket string? If you want tighter strings, what do you do to prevent breakage: use thinner or thicker strings? Why? What causes strings to break when they are hit by the ball?



6. The breaking stress for a tendon is around 80 x 106 N/m2. If the tendon at the lower end of your biceps is 5 mm in diameter, estimate the maximum mass that you could hold in your hand before the tendon breaks. Assume that you are standing with your elbow by your side and your forearm out straight from your side. Refer to the example in the lecture notes where the force exerted by the biceps was calculated, when holding a 5 kg mass.URGENT NEED PHYSICS HELP PLEASE!?
That is so easy, superman isn't real