College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 11, Problem 3CQ
Substance A has twice the specific heat of substance B. Equal masses of the two substances, at different temperatures, are placed in thermal contact and allowed lo come to equilibrium. (a) What is the ratio QB/QA of the energy transferred to (or from) the samples? (Hint: Remember to include the correct signs.) (b) What is the ratio ΔTB/ΔTA of their temperature changes?
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Substance A has twice the specific heat of substance B. Equal masses of the two substances, at different temperatures, are placed in thermal contact and allowed to come to equilibrium. (a) What is the ratio QB /QA of the energy transferred to (or from) the samples? (Hint: Remember to include the correct signs.) (b) What is the ratio ΔTB /ΔTA of their temperature changes?
Substance A has seven times the specific heat of substance B. Equal masses of the two substances, at different
temperatures, are placed in thermal contact and allowed to come to equilibrium.
HINT
(a) What is the ratio
signs.)
QB
QA
(b) What is the ratio
ATB
ATA
A
QB
of the energy transferred to (or from) the samples? (Hint: Remember to include the correct
QA
ATB of their temperature changes?
ATA
Assume Lake Superior contains 1.20 ✕ 1013 m3 of water, and assume the water's density is that of water at 20°C and 1 atm.
(a)
How much energy (in J) is required to raise the temperature of that volume of water from 14.6°C to 25.2°C?
From the density of water and the volume, what is the mass of the water? What is specific heat? How is it related to the energy input, mass, and temperature change? Use it to solve for the energy. Be careful with units. J
(b)
How many years would it take to supply this amount of energy by using a power of 1,200 MW generated by an electric power plant?
yr
Chapter 11 Solutions
College Physics
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