Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 21, Problem 22PQ
To determine
Whether the manufacture’s claim about the power of electric kettle is correct or not.
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Students have asked these similar questions
An engineer is designing a wire using an unknown material that will carry large amounts of electricity. The resistive heating of a 63.8 g wire is expected to add 512 J of heat energy during a 19-minute operating cycle.
What is the temperature increase of the wire?
You may use the following information about the unknown material to answer the question:
Specific Heat = 0.396 J g-1 °C-1
Density = 7.41 g/cm3
Coefficient Thermal Expansion = 5.8 µm m-1 K-1
The temperature is measured versus the energy added to 1 mol of a material.
What is the heat capacity of the solid closest to?
120 J °C–1
250 J °C–1
50 J °C–1
What is the boiling point of the material?
20 °C
–60 °C
50 °C
1. Which order of magnitude does the SI prefix
“mega-“ (M) represent?
A. 103
B. 106
C. 109
D. 1012
2. 2.34 kW is equal to
A. 2 340 W.
B. 23 400 W.
C. 234 000 W.
D. 2 340 000 W.
3. How many seconds (s) are there in 1 hour 20
minutes?
A. 80 s
B. 380 s
C. 4800 s
D. 87 600 s
4. It takes a kettle 5 minutes to transfer 540 kJ of
energy to boil some water. What is the power of
the kettle?
A. 1080 W
B. 1800 W
C. 9000 W
D. 108 000 W
5. A heater of power 1200 W is switched on for an
hour and a half. How much heat is given out from
the heater?
A. 2.16 kJ
B. 6.48 kJ
C. 2.16 MJ
D. 6.48 MJ
6. An immersion heater has a power of 1500 W.
How long does it take to supply 3 000 000 J of
heat?
A. 2 minutes
B. 5 minutes
C. 20 minutes
D. 33 minutes
7. An immersion heater is connected to power supply
via a joulemeter. The figure below shows the
variation of the reading of the joulemeter with
time.
Estimate the power of the immersion heater.
A. 582 W
B. 723…
Chapter 21 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 21.2 - Incorrect. Heat is not contained in Texas. The...Ch. 21.3 - In each situation listed, an objects temperature...Ch. 21.4 - Prob. 21.3CECh. 21.4 - Prob. 21.4CECh. 21.7 - Prob. 21.5CECh. 21.7 - Prob. 21.6CECh. 21.7 - Prob. 21.7CECh. 21.7 - Prob. 21.8CECh. 21.7 - Prob. 21.9CECh. 21 - Prob. 1PQ
Ch. 21 - Prob. 2PQCh. 21 - You extend an impromptu invitation to a friend for...Ch. 21 - Prob. 4PQCh. 21 - Prob. 5PQCh. 21 - Prob. 6PQCh. 21 - Prob. 7PQCh. 21 - Prob. 8PQCh. 21 - Prob. 9PQCh. 21 - Prob. 10PQCh. 21 - Prob. 11PQCh. 21 - Prob. 12PQCh. 21 - Prob. 13PQCh. 21 - Prob. 14PQCh. 21 - Prob. 15PQCh. 21 - Prob. 16PQCh. 21 - Prob. 17PQCh. 21 - Prob. 18PQCh. 21 - Prob. 19PQCh. 21 - From Table 21.1, the specific heat of milk is 3.93...Ch. 21 - Prob. 21PQCh. 21 - Prob. 22PQCh. 21 - An ideal gas is confined to a cylindrical...Ch. 21 - Prob. 24PQCh. 21 - You place frozen soup (T = 17C) in a microwave...Ch. 21 - A 25-g ice cube at 0.0C is heated. After it first...Ch. 21 - Prob. 27PQCh. 21 - Prob. 28PQCh. 21 - Prob. 29PQCh. 21 - Prob. 30PQCh. 21 - Consider the latent heat of fusion and the latent...Ch. 21 - Prob. 32PQCh. 21 - Prob. 33PQCh. 21 - A thermodynamic cycle is shown in Figure P21.34...Ch. 21 - Prob. 35PQCh. 21 - Figure P21.36 shows a cyclic thermodynamic process...Ch. 21 - Figure P21.37 shows a PV diagram for a gas that is...Ch. 21 - Prob. 38PQCh. 21 - Prob. 39PQCh. 21 - Prob. 40PQCh. 21 - Prob. 41PQCh. 21 - Prob. 42PQCh. 21 - Prob. 43PQCh. 21 - Prob. 44PQCh. 21 - Figure P21.45 shows a cyclic process ABCDA for...Ch. 21 - Prob. 46PQCh. 21 - Prob. 47PQCh. 21 - Prob. 48PQCh. 21 - Prob. 49PQCh. 21 - Prob. 50PQCh. 21 - Prob. 51PQCh. 21 - Prob. 52PQCh. 21 - Prob. 53PQCh. 21 - Prob. 54PQCh. 21 - Prob. 55PQCh. 21 - You extend an impromptu invitation to a friend for...Ch. 21 - Prob. 57PQCh. 21 - Prob. 58PQCh. 21 - A lake is covered with ice that is 2.0 cm thick....Ch. 21 - A concerned mother is dressing her child for play...Ch. 21 - Prob. 61PQCh. 21 - Prob. 62PQCh. 21 - Prob. 63PQCh. 21 - Prob. 64PQCh. 21 - Prob. 65PQCh. 21 - Prob. 66PQCh. 21 - Prob. 67PQCh. 21 - Prob. 68PQCh. 21 - Three 100.0-g ice cubes initially at 0C are added...Ch. 21 - Prob. 70PQCh. 21 - Prob. 71PQCh. 21 - Prob. 72PQCh. 21 - Prob. 73PQCh. 21 - Prob. 74PQCh. 21 - Prob. 75PQCh. 21 - Prob. 76PQCh. 21 - Prob. 77PQCh. 21 - Prob. 78PQCh. 21 - How much faster does a cup of tea cool by 1C when...Ch. 21 - The PV diagram in Figure P21.80 shows a set of...Ch. 21 - Prob. 81PQCh. 21 - Prob. 82PQCh. 21 - Prob. 83PQCh. 21 - Prob. 84PQCh. 21 - Prob. 85PQ
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