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Question1

A 52 kg mountain climber, starting from rest, climbs a vertical space of 730 m. At the top, she is again at rest. In method, her body generates 4.1 x 10^6 J of energy via metabolic processes. In fact, her body acts like a heat engine. Find out her effectiveness as a heat engine.

Question2

The sun is a sphere with radius 6.96 x 10^8 m and the average surface temperature of 5800 K. establish amount by which the sun's thermal radiation increases the entropy of entire universe each second. Suppose sun is a perfect emitter (that is, e = 1), and that an average temperature of the rest of the universe is 2.73 K. Do not think about the thermal radiation absorbed by the sun from the rest of universe.

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