Fundamentals of Physics Study Set 2

Physics & Astronomy

Quiz 20 :
Entropy and the Second Law of Thermodynamics

Quiz 20 :
Entropy and the Second Law of Thermodynamics

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In a reversible process the system:
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A

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A slow (quasi-static)process is NOT reversible if:
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D

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Possible units of entropy are:
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B

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For all adiabatic processes:
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For all reversible processes involving a system and its environment:
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For all irreversible processes involving a system and its environment:
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The change in entropy is zero for:
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Which of the following processes leads to a change in entropy of zero for the system undergoing the process?
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An ideal gas expands into a vacuum in a rigid vessel.As a result there is:
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Which of the following is NOT a state variable?
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A hot object and a cold object are placed in thermal contact and the combination is isolated.They transfer energy until they reach a common temperature.The change Sh in the entropy of the hot object, the change Sc in the entropy of the cold object, and the change Stotal in the entropy of the combination are:
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Consider all possible isothermal contractions of an ideal gas.The entropy of the gas:
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Rank from smallest to largest, the changes in entropy of a pan of water on a hot plate, as the temperature of the water img
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An ideal gas is to taken reversibly from state i, at temperature T1, to other states labeled I, II, III, IV and V on the p-V diagram below.All are at the same temperature T2. Rank the five processes according to the change in entropy of the gas, least to greatest. img
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An ideal gas, consisting of n moles, undergoes a reversible isothermal process during which the volume changes from Vi to Vf.The change in entropy of the thermal reservoir in contact with the gas is given by:
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One mole of an ideal gas expands reversibly and isothermally at temperature T until its volume is doubled.The change of entropy of this gas for this process is:
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An ideal gas, consisting of n moles, undergoes an irreversible process in which the temperature has the same value at the beginning and end.If the volume changes from Vi to Vf, the change in entropy is given by:
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The temperature of n moles of a gas is increased from Ti to Tf at constant pressure.If the molar specific heat at constant pressure is Cp and is independent of temperature, then change in the entropy of the gas is:
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Consider the following processes: The temperatures of two identical gases are increased from the same initial temperature to the same final temperature.Reversible processes are used.For gas A the process is carried out at constant volume while for gas B it is carried out at constant pressure.The change in entropy:
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The difference in entropy S = SB - SA for two states A and B of a system can computed as the integral dQ/T provided:
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