Assignment:
Question 1. In 1955 a pilot fell 370 meters without his parachute opening. He landed in a snowbank, making a crater 1.1 meters deep. He walked away with minor injuries. If his mass was 80 kg and his terminal velocity was 35 m/s, calculate
a) the work done on him by the snow
b) the average force exerted on him by the snow
c) the work done on him by air resistance
Question 2. An ideal pulley has a string over it, with masses attached to either end. One end has a 5kg mass, sitting on the floor. The other end has an 8kg mass, which starts from rest but the string is so short that it starts 3 meters above the floor. Use the work-energy theorem to calculate the masses' speeds when the 8kg mass reaches the floor
Question 3. My 'pop' gun is essentially a spring that fires marbles as projectiles. If I load the gun by compressing the spring 9cm with 7 newtons of force, how fast will it project a 25 gram marble?