A 170 cm³ cup of coffee cools from 88°C to the 20°C temperature of the room. Assume that thetemperature of the room does not change and coffee has the same specific heat and density aswater.What is the entropy change of the coffee?Express your answer with the appropriate units.AS cofee = ValueSubmitPart BASroom =SubmitHÅWhat is the entropy change of the room?Express your answer with the appropriate units.Part CRequest AnswerSubmitμÅValueRequest AnswerμAA.Suniverse ValueUnitsWhat is the entropy change of the universe?Express your answer to two significant figures and include the appropriate units.Request AnswerUnits?Units?Sy ?

The volume of cup of coffee, The initial temperature of cup, The final temperature of cup,

A 170 cm³ cup of coffee cools from 88°C to the 20°C temperature of the room. Assume that the temperature of the room does not change and coffee has the same specific heat and density as water. What is the entropy change of the coffee? Express your answer with the appropriate units. AS cofee = Submit Part B ASToom= Submit Part C μÀ What is the entropy change of the room? Express your answer with the appropriate units. Value ASuniverse Request Answer HÅ Value Request Answer μÀ Units Value What is the entropy change of the universe? Express your answer to two significant figures and include the appropriate units. 4 Units ? Units ?

A 170 cm³ cup of coffee cools from 88°C to the 20°C temperature of the room. Assume that the temperature of the room does not change and coffee has the same specific heat and density as water. What is the entropy change of the coffee? Express your answer with the appropriate units. AS cofee = Submit Part B ASToom= Submit Part C μÀ What is the entropy change of the room? Express your answer with the appropriate units. Value ASuniverse Request Answer HÅ Value Request Answer μÀ Units Value What is the entropy change of the universe? Express your answer to two significant figures and include the appropriate units. 4 Units ? Units ?

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter22: Heat Engines, Entropy, And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 22.2OQ: Assume a sample of an ideal gas is at room temperature. What action will necessarily make the...

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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?
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) 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
(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 thermal engine produces 4 MJ of electrical energy while operating between two thermal baths of different temperatures. The working substance of the engine discharges 5 MJ of heat to the cold temperature bath. What is the efficiency of the engine?
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.
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.
Assume a sample of an ideal gas is at room temperature. What action will necessarily make the entropy of the sample increase? (a) Transfer energy into it by heat, (b) Transfer energy into it irreversibly by heat, (c) Do work on it. (d) Increase either its temperature or its volume, without letting the other variable decrease, (e) None of those choices is correct.
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. 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) Prepare a table like Table 18.1 for the following occurrence. You toss four coins into the air simultaneously and then record the results of your tosses in terms of the numbers of heads (H) and tails (T) that result. For example, HHTH and HTHH are two possible ways in which three heads and one tail can be achieved. (b) On the basis of your table, what is the most probable result recorded for a toss? In terms of entropy, (c) what is the most ordered macrostate, and (d) what is the most disordered?
(a) What is the hot reservoir temperature of a Carnot engine that has an eficiency of 42.0% and a cold reservoir temperature of 210C ? (b) What must the hot reservoir temperature be for a real heat engine that achieves 0.700 of the maximum eficiency, but still has an efficiency of 42.0% (and a cold reservoir at 27.0C )? (c) Does your answer imply practical limits to the efficiency of car gasoline engines?