I had to put a lot of questions at once because I'm almost out of points. Just help one the ones you can =)
6. A boulder rests on a ledge 31.2 m above a lake. If it has 2.65 × 105 J of gravitational potential energy relative to the lake surface, what is the mass of the boulder? Show all your work.
7. On a highway, a car with a mass of 1.1 × 103 kg is travelling at 25 m/s. What is the kinetic energy of the car? Show all your work.
8. A girl is travelling on her bike at a speed 2.54 m/s. If the girl and her bike have a kinetic energy of 193 J, what is the combined mass of the girl and her bike? Show all your work.
9. A hockey puck has a mass of 0.20 kg. If the hockey puck is moving with 75 J of kinetic energy, what is its speed? Show all your work.
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Answer:
Predict which substance in each pair will have higher boiling and
melting points.
Explanation:
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