65 g of aluminum at 100° C are placed in thermal contact with 65 g of copper at 0°C. The twometals are isolated from the environment.Part AAs the metals reach thermal equilibrium, what is the entropy change of the aluminum?Express your answer with the appropriate units.ASAL=SubmitPart BDDi μASubmitValuePart CRequest AnswerASC₁ = ValueAs the metals reach thermal equilibrium, what is the entropy change of the copper?Express your answer with the appropriate units.μAASuniverse =Request AnswerUnitsμÃwwww.ValueUnitsSAs the metals reach thermal equilibrium, what is the entropy change of the universe?Express your answer to two significant figures and include the appropriate units.?Units??

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65 g of aluminum at 100°C are placed in thermal contact with 65 g of copper at 0°C. The two metals are isolated from the environment. Part A As the metals reach thermal equilibrium, what is the entropy change of the aluminum? Express your answer with the appropriate units. ASM= Value Submit Part B HA Submit ASC₂ = Value Part C Request Answer As the metals reach thermal equilibrium, what is the entropy change of the copper? Express your answer with the appropriate units. HA 1 ASuniverse = Request Answer Units μÃ 1 Value w Units As the metals reach thermal equilibrium, what is the entropy change of the universe? Express your answer to two significant figures and include the appropriate units. ? PAK ? → C www ? Units

65 g of aluminum at 100°C are placed in thermal contact with 65 g of copper at 0°C. The two metals are isolated from the environment. Part A As the metals reach thermal equilibrium, what is the entropy change of the aluminum? Express your answer with the appropriate units. ASM= Value Submit Part B HA Submit ASC₂ = Value Part C Request Answer As the metals reach thermal equilibrium, what is the entropy change of the copper? Express your answer with the appropriate units. HA 1 ASuniverse = Request Answer Units μÃ 1 Value w Units As the metals reach thermal equilibrium, what is the entropy change of the universe? Express your answer to two significant figures and include the appropriate units. ? PAK ? → C www ? Units

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter15: Thermodynamics

Section: Chapter Questions

Problem 47PE: (a) On a winter day, a certain house loses 5.00108J of heat to the outside (about 500,000 Btu). What...

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Two hundred grams of water at 0 is brought into contact into thermal equilibrium successively with reservoirs at 20 , 40 , 60 , and 80 . (a) What is the entropy change of the water? (b) Of the reservoir? (c) What is the entropy change of the universe?
An ideal gas is taken from an initial temperature Ti to a higher final temperature Tf along two different reversible paths as shown in Figure 21.15. Path A is at constant pressure, and path B is at constant volume. What is the relation between the entropy changes of the gas for these paths? (a) SA SB (b) SA = SB (c) SA SB Figure 21.15 (Quick Quiz 21.5) An ideal gas is taken from temperature Ti to Tf via two different paths.
The Carnot cycle is represented by the temperature-entropy diagram shown below. (a) How much heat is absorbed per cycle at the high-temperature reservoir? (b) How much heat is exhausted per cycle at the low-temperature reservoir? (c) How much work is done per cycle by the engine? (d) What is the efficiency of the engine?
An ideal gas at temperature T is stored in the left half of an insulating container of volume V using a partition of negligible volume (see below). What is the entropy change per mole of the gas in each of the following cases? (a) The partition is suddenly removed and the gas quickly fills the entire container. (b) A tiny hole is punctured in the partition and after a long period, the gas reaches an equilibrium state such that there is no net flow through the hole. (c) The partition is moved very slowly and adiabatically all the way to the light wall so that the gas finally fills the entire container.
(a) What is the change in entropy if you start with 100 coins in the 45 heads and 55 tails macrostate, toss them, and get 51 heads and 49 tails? (b) What if you get 75 heads and 25 tails? (c) How much more likely is 51 heads and 49 tails than 75 heads and 25 tails? (d) Dues either outcome violate the second law of thermodynamics?
An ideal gas is taken from an initial temperature Ti to a higher final temperature Tf along two different reversible paths. Path A is at constant pressure, and path B is at constant volume. What is the relation between the entropy changes of the gas for these paths? (a) SA SB (b) SA = SB (c) SA SB
A monoatomic ideal gas (n moles) goes through a cyclic process shown below. Find the change in entropy of the gas in each step and the total entropy change over the entire cycle.
Objects A and B with TA TB are placed in thermal contact and come to equilibrium. (a) For which object does the entropy increase? (b) For which object does the entropy decrease? (c) Which object has the greater magnitude of entropy change?
(a) On a winter day, a certain house loses 5.00108J of heat to the outside (about 500,000 Btu). What is the total change in entropy due to this heat transfer alone, assuming an average indoor temperature of 21.0C and an average outdoor temperature of 5.00C ? (b) This large change in entropy implies a large amount of energy has become unavailable to do work. Where do we find more energy when such energy is lost to us?
(a) What is the change in entropy if you start with 10 coins in the 5 heads and 5 tails macrostate, toss them, and get 2 heads and 8 tails? (b) How much more likely is 5 heads and 5 tails than 2 heads and 8 tails? (Take the ratio of the number of microstates to find out.) (c) If you were betting on 2 heads and 8 tails would you accept odds of 252 to 45? Explain Why or why not. Table 15.5 10Coin Toss MacrostateNumber of Microstates (W) Heads Tails 10 0 1 9 1 10 8 2 45 7 3 120 6 4 210 5 5 252 4 6 210 3 7 120 2 8 45 1 9 10 0 10 1 Total: 1024
What is the entropy of a freshly shuffled deck of 52 playing cards?
A Carnot engine operating between heat reservoirs at 500 and 300 K absorbs 1500 J per cycle at the high-temperature reservoir. (a) Represent the engine's cycle on a temperature-entropy diagram. (b) How much per cycle is done by the engine?