Practice Problems
Heat Transfer Methods
Topics:
On this worksheet you will investigate properties of
the three heat transfer methods
Page Directions
The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.
Before beginning any given worksheet, please look over all of the questions and make sure that there are
no duplicate
answers shown for the same question. If duplicates are present simply refresh the page until every answer is unique.
In order to check an answer
(even when you are just starting the worksheet on Question 1)
it is necessary to
any questions that you have not answered. Once you start submitting answers, the page may be checked as many times as necesasary without changing the randomized answers. Relevant scoring will be provided at the top of the page only when you answer all of the questions on your original submission.
omit
Question 1
Which method of heat transfer involves actual particles circulating from one region to another?
convection
conduction
radiation
omit
Question 2
Which heat transfer method can take place without a medium, that is, in a vacuum?
conduction
radiation
convection
omit
Question 3
Newton's Law of Cooling allows us to calculate the rate at which the temperature difference between a hot object and the ambient room temperature changes with the passage of time. T
diff
= T
o
e
-kt
. At time t = 0, the original temperature difference between a hot solid and the ambient room temperature is 55.9 ºC. If the temperature difference drops to half that value in 19.8 seconds, what is the value of the decay constant, k?
0.0299 per second
0.0286 per second
0.0350 per second
0.0505 per second
omit
Question 4
At what time will the temperature difference equal 12.3ºC?
64.9 sec
43.3 sec
29.7 sec
35.8 sec
omit
Question 5
An incandescent black body has a peak wavelength of 546 nm when its temperature is 5311 Kelvin. What would be the temperature of a second blackbody radiator that has a peak wavelength of 360.36 nm?
8048 Kelvin
5497 Kelvin
9860 Kelvin
3505 Kelvin
omit
Question 6
Compare the rate at which energy is given off by the second black body in Question #5 which has a peak wavelength of 360.36 nm to the first black body which has a peak wavelength of 546 nm.
1.5 : 1
5.3 : 1
1.1 : 1
2.3 : 1
omit
Question 7
If two other incandescent solids are at the same temperature, but one has a surface area that is 6 times greater, how would the radiant power of the larger black body compare to the rate at which energy is emitted by the smaller black body?
it would be 1296 times greater
it would be 36 times greater
it would be 6 times greater
it would be 1.57 times smaller
omit
Question 8
One end of a 55.9-cm copper rod (
a
= 385 W/mK) is placed in 100 grams of cold water at a temperature of 3.96 ºC. The other end is placed in the flame of a bunsen burner at a temperature of 944 ºC. If the rod has a radius of 0.6 cm, then what is the initial rate at which heat is conducted along the rod?
73.2 J/sec
24.4 J/sec
19.0 J/sec
86.3 J/sec
omit
Question 9
If a second copper rod has the same length as the rod in Question #8 but has a radius of 0.132 cm, how would the rate of conductivity be changed?
it would not change
it would decease by a factor of 0.220
it would increase by a factor of 21
it would decease by a factor of 0.0484
it would increase by a factor of 5
omit
Question 10
If a third copper rod has the same radius as the rod in Question #8, but a length of 78.26 cm, how would the rate of conductivity be changed?
it would be 60% as great
it would be 2.5% as great
it would be 40% as great
it would be 16.0% as great
omit
Question 11
A 350 watt immersion heater is used to heat a cup of water containing 203 grams of water and a piece of ice. The cup is made of styrofoam which is an insulator and does not give up or receive heat. If it takes 3.20 minutes for the heater to bring the contents of the cup from 0ºC to 65ºC, how much ice was originally present? Here are some constants: c
ice
= 2093 J/kgºC, c
water
=4186 J/kgºC, L
f
= 334 kJ/kg
31.4 grams
55.7 grams
19.8 grams
44.1 grams
PhysicsLAB
Copyright © 1997-2025
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton