Download Review Unit 6

Review Unit 4
Energy Transformations
1. Define each of the following kinds of energy.
Energy
Chemical potential
energy
Nuclear energy
Elastic potential
energy
Electrical energy
Kinetic energy
Thermal energy
Sound energy
Gravitational
potential energy
Radiant energy
2. Identify the type of energy each of the following has.
Description
3. Write an energy transformation equation for each of the following.
a) A ball falls from the top of the building.
b) A firework explodes.
c) An incandescent light bulb comes on.
4. What is the formula for kinetic energy? Rearrange the formula for m and v.
5. Calculate the kinetic energy of a 150 g baseball that is travelling toward home plate at a constant speed of
35 m/s.
6. A dynamics cart has a kinetic energy of 4.2 J when moving across a floor at 5.0 m/s. What is the mass of
the cart?
7. What is the formula for gravitational potential energy? Rearrange the formula for m and h.
8. What is the gravitational potential energy of a 48 kg student at the top of a 110 m high drop tower ride
relative to the ground?
9. A bobsleigh with four people on board has a total mass of 610 kg. How fast is the sleigh moving if it has a
kinetic energy of 40 000 J?
10. Restate, in your own words, the Law of Conservation of Energy.
11. What is mechanical energy?
12. A golf ball of mass 45.9 g is launched from a height of 8.0 m above the level of the green at a speed of 20.0
m/s. At what speed will the golf ball strike the ground?
13. A ball is thrown upward with an initial speed of 2.2 m/s from a position 4.5 m above the ground. What is
the maximum height of the ball?
14. Define power in your own words.
15. What are the two formulae for power?
16. A 64 kg student climbs from the ground floor to the second floor of his school in 5.5 s. The second floor is
3.7 m above the ground floor. What is the student’s power?
17. What is meant by the term “efficiency”?
18. What are the formulae for efficiency and % efficiency?
19. What is the efficiency, and percent efficiency, of a rope-and-pulley system if a painter uses 1930 J of
mechanical energy to pull on the rope and lift a 20.0 kg pain barrel at a constant speed to a height of 7.5 m
above the ground?
20. Why is it impossible for anything to be more than 100% efficient?
21. What happens to the efficiency of a ramp as the height of the ramp increases? Why?
22. How does a thermometer work?
23. What are the three factors that affect how easy it is to change a substances temperature?
24. Explain each of the factors in question 23.
25. What is the equation for quantity of heat? Rearrange the formula for C, m and ΔT.
26. What is specific heat capacity? What is its symbol and units?
27. When 0.200 kg of water is heated from 15.0℃ to 40.0℃, how much thermal energy is absorbed by the
water?
28. An aluminum block absorbs 1.0 × 104 J of energy from the Sun when its temperature increases by 5.0℃.
What is the mass of the block?
29. Fill in the following chart.
Method of Heat
Transfer
Explain
30. Restate the Principle of Heat Exchange in your own words.
31. A 0.060 kg sample of metal is heated to 100.0℃ before being placed in 0.200 kg of water with an initial
temperature of 10.0℃. The metal-water combination reaches a final temperature of 15.6℃. Determine the
specific heat capacity of the metal.
32. Be familiar with all 9 methods of electricity generation. List the 9 types in the space provided below.
33. Compare nuclear power plants with hydroelectric power plants using the following chart.
Efficiency
Method of Generation
Nuclear Energy
Hydroelectric Energy
34. What does it mean for a resource to be green?
35. Describe one advantage and one disadvantage in using
a) non-renewable energy resources
b) renewable energy resources
Environmental Impact