Solve the following problems: (3pts each) 1. Calculate the power of a car brake that it is capable of doing 40000J of work in 5 s when stopping the car.
2. Kram can lift a 40.0-kg sack of rice at a height of 0.10 m 15 times in 1 minute. What is Kram’s power output?
3. How much work is done in lifting an object that weighs 250N to a height of 4m?
4. How much power is exerted if the 250N object is lifted to a height 4m in 4s?
5. While doing a chin-up, Gina lifts her 45.0-kg body to a height of 0.25 meters in 5 seconds. What is the power delivered by Gina's biceps?