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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:An irreversible process takes place by which the entropy of the universe increases by 1.62 J/K. If the temperature of the environment in which the process occurred is 220 K, how much energy (in J)
was made unavailable for useful work as a result?
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Step 1
Given value---
- change in entropy = 1.62 J/K.
- temperature = 220 K.
We need to find ---
- how much energy was made unavailable for useful work as a result?
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- is said to occur when two or more subsystems work together to produce more than the total of what they could produce individually. This is sometimes defined as the whole being greater than the sum of the parts. Entropy O Synergy O An open system O A closed system O A subsystemarrow_forwardSuppose that you have left a 200 mL cup of coffee sitting until it has cooled to 30◦ C, which you find totally unacceptable. Your microwave oven draws 1100W of electrical power when it is running. If it takes 45s for this microwave oven to raise the temperature of the coffee to 60◦ C, what is the efficiency of heating with this oven? You will need to use the fact that 4.2 J of energy is required to raise the temperature of 1.0 mL of coffee by 1.0◦ C.arrow_forwardA system consists of a 1.2 kg block of copper at 20∘C and 1.5 kg block of copper at 200 ∘C. The two blocks, isolated from the environment, are placed in contact until thermal equilibrium is reached. The specific heat of copper is 385 J/kg⋅K. What is the change in entropy of the system?arrow_forward
- The entropy of a reversible process is Tds = du + pdv Obtain an expression for the change of entropy as a function of cp, P and T.arrow_forwardThe temperature at the surface of the Sun is approximately 5,600 K, and the temperature at the surface of the Earth is approximately 291 K. What entropy change of the Universe occurs when 4.50 103 J of energy is transferred by radiation from the Sun to the Earth? ____________ J/Karrow_forwardthe entropy of the universe is continually decreasing constant continually increasing the same as the energy E zeroarrow_forward
- On a hot summer day, 2.00 x 106 J of heat transfer into a parked car takes place, increasing its temperature from 33.0°C to 45.2°C. What is the increase in entropy (in J/K) of the car due to this heat transfer alone? J/Karrow_forwardA box contains 100 gas molecules all released on the left side of the box. What is the initial entropy of all the gas molecules on one side? You can calculate the number of microstates (left/right distribution of molecules) possible by the equation W = N! / ( nL! * nR!,) where N is the total number of molecules and nL is the number on the left and nR is the number on the right. What is the entropy of the most disorganized distribution of gas molecules?arrow_forward
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