15. a heat engine operating between temperatures of 100 k and 500 k has an efficiency of 55%. if each cycle expels 800 j of heat, what is the change in entropy of the universe due to each cycle? a) 5.33 j/k b) 5.09 j/k c) 4.80 j/k d) 4.44 j/k e) 0.00 j/k

option (d)

Explanation:

temperature at cold bath, Tc = 100 K

temperature at hot bath, TH = 500 K

Efficiency = 55 %

heat expelled, Qc = 800 J

Let the heat intake is QH.

Use the formula for the efficiency

QH = 1777.77 J

Where, ΔS1 is the change in entropy

ΔS(universe) = 8 - 3.55 = 4.44 J/K

option (d)

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explanation:

80cm/s.

24cm/s.

53.3cm/s.