Problems 1
Find the kinetic energy of a 74 kg child running at a speed of 4 m/s. ___.
41. 592 J
An object has gravitational potential energy because of its position above ___ .
2. Earth's Surface
If a book is sitting on a shelf 8 meters high with a mass of 2.2 kg, How much potential energy does it have? _____.
42. 172.48 J
The _______________________________ states that energy cannot be created or destroyed.
3. Law of conservation of energy.
Kinetic energy and potential energy changes as an object speeds up or slows down but the _____________________________-__ never changes
4. Mechanical energy
What is the mass of an object whose GPE is 567 J that is sitting 5m high?
44. 11.57 kg
Before a rubber band is released, it has stored energy due to its ___ .
17. elasticity
What is the GPE of a chandelier that has a mass of 5.4 kg and 6m high.
43. 317.52 J
Energy conservation is simply talking about using less __________________________ and ____________________ resources and finding more clean energy.
7. coal and fuel oil
When two or more nuclei form a nucleus with a larger mass ___________________________ has occurred.
16. Nuclear fusion
A base jumper weighs 76 kg and is on a 81 m tall building. What is his GPE?
60,328.8 J
For which of the following is kinetic energy transformed into potential energy?
18. a ball is thrown upwards
What is the height of an object that has a mass of 8 m and a GPE of 341 J?
45. 4.35 m
A gram of fat contains ____________________ Calories.
15. 9 Calories
Energy does not always have to involve __ .
23. movement
What is the kinetic energy of a marble with a mass of 5 g, moving at a speed of 8 m/s?
160 J
Stored energy due to position is called ______________________ .
21. potential energy
What is the GPE of an apple with a mass of 6 kg positioned at a height of 13 m?
764.4 J
The complex chemical and physical processes going on in your body also obey the law of_______
26. Conservation of energy
What is Energy?
32. The ability to do work
What is the GPE of a bell with a mass of 32 kg sitting in a tower 21 meters tall?
6,585.6 J
If two objects are the same height, the object with the greater_______________________________ has the larger GPE.
33. mass
What is the kinetic energy of a bike rider with a mass of 48kg going a speed of 5 m/s?
600 J
When potential energy changes into kinetic energy the total amount of energy ____.
38. never changes
A car engine transforms chemical potential energy into ___________________________ in a moving car.
34. kinetic energy