College Physics:
11th Edition
ISBN: 9781305965515
Author: SERWAY, Raymond A.
Publisher: Brooks/Cole Pub Co
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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?
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
A block of metal of mass 54 grams initially at a temperature of
285° C is placed in 474 grams of water initially at a temperature of
50° C. If we can ignore energy losses to the environment, what is
the equilibrium temperature that the metal and the water will
reach? The specific heat capacity of the metal is 0.28 cal/g/ºC.
Round off your answer to a whole number (no decimals) but
do not type the unit.
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