# Determine the Number of Moles for the Water of Crystallization in Copper Sulphate

#### Change in Potential Energy Worksheet

** 1.** A 7. 3 kg gallon paint can is lifted 1. 78 meters vertically to a shelf. What is the change in potential energy of the paint can?

** 2.** A roller coaster car of mass 465 kg rolls up a hill with a vertical height of 75 m from the ground. What is the change in potential energy relative to the ground?

**3.** If the car in problem #2 starts at rest from the height of 75 m, what will its speed be when it is 5 meters from the ground? What is the change in potential energy relative to the ground? What is the change in kinetic energy relative to the ground?

**4.** The same roller coaster car in problem #2 rolls down a vertical height of 40 m from the ground. What is the change in potential energy relative to the ground?

**5.** A 783 kg elevator rises straight up 164 meters. What is the change in the potential energy of the elevator relative to the ground?

** 6.** A car coasts 62. 2 meters along a hill that makes a 28. 3° angle with the ground. If the car’s mass is 1234 kg, then what is the change in potential energy?

**7.**

- a) How fast is the bicyclist traveling when she jumps off the ramp 4 m high?
- b) What is the maximum vertical height the bicyclist will reach?

** 8.** What is the highest height Tarzan can travel to given the information above?

**9.** What is the jet’s new velocity if it coasts to its new, lower, altitude?

**10.** An 80 kg trucker loads a crate as shown below. He pushes the 40 kg box such that his arms are parallel to the ground. He pushes with a 100 N force. How much work is done by the trucker on the box?

**11.** A 2800 kg car exerts a constant force of 20,000 N while traveling across 50 m. The car starts from rest.

- (a) How much work is done by the car?
- (b) How much power is exerted by the car, in watts?

**12.** A car 2400 kg is traveling down the road at 26. 1 m/s. If the car accelerates up to 35 m/s over a distance of 200 m then

- (a) How much work is done by the car?
- (b) How much power is exerted by the car, in watts?

**13.** What is the work done over the first 12 meters? What is the power if it is done in 1 minute?

**14.** What is the work done over the first 24 meters? What is the power if it is done in 1 hour?

** 15.** What is the work done over the first 32 meters? What is the power if it is done in 30 minutes?

** 16.** What is the work done over the first 52 meters? What is the power if it is done in 1200 s?

**17.** How much work is done between 32 and 52 meters? What was the change in power if it was