Work and Power
1) Calvin drags his sled 50 m applying a force of 70 N. How much work is done on the sled?
2) Calvin goes down the hill on his sled. In a short time, he goes from 0 m/s to 5 m/s. Calvin and his sled have a total mass of 40 kg.
a) What is his kinetic energy, when he has reached 5 m/s?
b) How much work has been done on the sled, accelerating him to 5 m/s?
3) You bought a 60 W light bulb.
a) How much energy does this light bulb use per second?
b) How much energy does this light bulb use per minute?
4) Paul has a mass of 50 kg and climbs a rope of 5 m in 10 s.
a) What is his in potential energy?
b) What power did it take to climb the rope?