1. a. Describe the type of energy that is observed when a musician's finger plucks a guitar string. (1 point) b. Explain how the energy described in the previous question is transferred to your ear when it reaches you. Does it give your ear kinetic or potential energy? (1 point)

2. Name three types of energy that exist in a large piece of charcoal on a grill in the sunlight. Explain why the charcoal has each type of energy. (3 points)
Type of energy Explanation

3. A person holds a 0.300 kg pomegranate at the top of a tower that is 96 m high. Another person holds a 0.800 kg melon next to an open window 32 m up the tower.
a. Draw a diagram to illustrate the situation. (1 point)

b. Calculate the gravitational potential energies of the melon and the pomegranate. Which one has more potential energy? (2 points)

c. At what height would the pomegranate have the same potential energy as the melon? (1 point)

d. If they are dropped from their original heights at the same time, will the melon or the pomegranate hit the ground first? Explain. (1 point)

4. The diagram represents the path of a ball that has been thrown upward. Discuss how the kinetic energy (KE), gravitational potential energy (GPE), and total mechanical energy (ME) change between points A (where the ball is thrown from), B (the highest point reached by the ball), and C (where the ball hits the ground). Ignore friction between the ball and the air. (3 points)

mechanical energy question

5. What energy transformations occur when a person turns on a lightbulb by connecting its circuit to a battery? List and describe transformations involving three types of energy. (3 points)

6. Explain a situation in which elastic potential energy could be transformed into kinetic energy. (1 point)

7. Explain how magnetic potential energy can be transformed into kinetic energy. (1 point)

8. Explain how kinetic energy can be transformed into thermal energy using friction. (1 point)

9. a. Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy does it have? (2 points)

b. At what speed would the animal with less KE have to travel to have the same kinetic energy as the animal with more KE? (1 point)

10. Discuss the kinetic and potential energy of the ball on the end of a pendulum as it swings from point A to point B. Explain the kinetic energy and potential energy of the ball at each point and what happens to energy as the ball moves from point A to point B. In your discussion, answer the following questions:
When is the kinetic energy of the ball zero and when is it at its highest? When is its potential energy at its lowest and at its highest? What happens to the kinetic energy and potential energy between point A and point B? (3 points)