Waves Practice Problem Set Worksheet Page 30
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ECHANICS
RACTICE
ROBLEM
ETS
Unit 9 T
HERMODYNAMICS
9.1
T
H
EMPERATURE AND
EAT
1. Find the Celsius and Kelvin temperatures corresponding to:
a. A winter night in Seattle (41°F)
Answer: 5°C, 278 K
b. A hot summer day in Palm Springs (107.0°F)
Answer: 41.67°C, 314.8 K
c. A cold winter day in northern Manitoba (-18.0°F) Answer: -27.8°C, 245 K
2. (G13.3) “Room temperature” is often taken to be 68°F; what is this on the Celsius
scale?
Answer: 20°C
a. The temperature of the filament in a light bulb is about 1800°C; what is this
on the Fahrenheit scale?
Answer: 3272°F
3. (G13.5) The highest and lowest recorded temperature were 136°F (in the Libyan
desert) and -129°F (in Antarctica). What are these temperatures on the Celsius scale?
Answer: 58°C, -89°C
4. (G13.8) At what temperature will the Fahrenheit and Centigrade scales yield the same
numerical value?
Answer: -40°
5. (G13.30) Typical temperatures in the interior of the Earth and Sun are about 4000°C
6
and 15 x 10
°C, respectively. What are these temperatures in Kelvin?
6
Answer: 4273 K, 15 x 10
K
6. How much heat is generated when the brakes are used to bring a 1000-kg car from a
speed of 25 m/s to 15 m/s?
Answer: 200 kJ
7. A 340-kg marble boulder rolls off the top of a cliff and falls a vertical height of 140 m
before striking the ground. Estimate the temperature rise of the rock if 50% of the
heat generated remains in the marble boulder.
Answer: 0.80°C
8. A surveyor uses a steel measuring tape that is exactly 50.000 m long at a temperature
of 20°C. What is its length on a hot summer day when the temperature is 35°C?
Answer: 50.009 m
9. During a bout with the flu an 80-kg man ran a fever of 2.0°C above normal, that is a
body temperature of 39.0°C instead of the normal 37.0°C. If the specific heat of the
human body is an average of 3470 J/kg•°C, how much heat is required to raise his
5
temperature by that amount?
Answer: 5.5 x 10
J
-
10. Suppose a copper rod that is 45.0 cm long and has a cross-sectional area of 1.25 x 10
4
2
m
connects two reservoirs. The hot reservoir has a temperature of 100°C and the
cold reservoir is 0°C. What is the rate of heat flow by conduction through the copper
rod? The thermal conductivity of copper is 385.0 W/m•K.
Answer: 10.7 W
11. A hiker is wearing clothing that is 0.469-cm to keep warm. Her skin temperature is
Gamzon & Gregorian-Michaelsen
6/7/16
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