PES Skill Sheets.book - Capital High School

Skill Sheet 7.3: Power in Flowing Energy
1. Answers are given in table below: 2. Answers are:
a. 1,800 J
Force (N) Distance
(m)
Time
(sec)
Skill Sheet 7.3: Efficiency and Energy
1. 55%
2. 12%
3. Answers are:
a. 91%
b. Energy is lost due to friction with the track (which creates
heat), air resistance, and the sound made by the track and
wheels.
Skill Sheet 8.2: Measuring Temperature
Stop and Think:
a. 15°C
b. 21°C
c. 23.0°C, 30.0°C, 30.0°C, 31.5°C, 31.5°C
Work (J) Power
(W)
100 2 5 200 40
100 2 10 200 20
100 4 10 400 40
100 5 25 500 20
50 20 20 1000 50
20 30 10 600 60
9 20 3 180 60
3 25 15 75 5
Skill Sheet 8.2: Temperature Scales
1. Answers are:
a. 100°C
b. 37°C
c. 4.4°C
d. –12.2°C
e. 32°F
f. 77°F
g. 167°F
2. 7.2°C
3. 177°C
4. 107°C
5. 374°F
6. 450°F
7. The table shows that the friend in Europe thinks that the
temperature is on the Celsius scale because 15°C is equal to
59°F, a relatively warm air temperature. However, 15°F is a
relatively cold air temperature, equivalent to –9.4°C.
°F °C
15°F = –9.4°C
59°F = 15°C
Skill Sheet 8.2: Reading a Heating/Cooling Curve
1. The iron changed from liquid to gas between points D and E.
2. The heat added to the iron was used to break the
intermolecular forces between the iron atoms.
Page 24 of 57
b. 450 watts
3. Answers are:
a. 60,000 J
b. 2,000 W; 2.68 hp
4. Answers are:
a. 36,750 J (37,000 J with correct significant figures)
b. 20.4 W (20 W with correct significant figures)
5. 200 W
6. Answers are:
a. 5,000 seconds or 1.4 hours
b. 8,640,000 J
c. 17.3 apples
7. Answers are:
a. 98,000 J
b. 98,000 W; 131 hp
8. 3.3 W
c. The first hill is the tallest because a roller coaster loses
energy as it moves along the track. No roller coaster is
100% efficient. Unless there is a motor to give it
additional energy, it will never be able to make it back up
to a height as high as the first hill.
4. 80%
5. 278 m
d. At 0°C, water changes from liquid to solid. At 100°C,
water changes from liquid to gas.
e. The liquid will expand so the level in the tube will
increase.
Answers to the “Reading the temperature” sections will vary.
8. Answers are:
a. –283°F
b. The melting point for this liquid is 35°F which is equal to
1.7°C. The melting point for mercury is –38.9°C
(–38.0°F). The unknown substance is not mercury, since
its boiling point is not the same as that of mercury.
Extension Answers:
1. 184K to 242K
2. –108°C
3. –139°C
4. –223°C
5. 5,273K to 8,273K
6. 10,273K
7. 1,000,273K
8. 15,000,273K
9. 622K
10. 900°F
3. The melting temperature of iron is about 1,500°C.