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A Carnot engine works between two heat reservoirs at temperatures Th = 305 K and Tc = 60 K.
(a) What is its efficiency?
%
(b) If it absorbs 85 J from the hot reservoir during each cycle, how much work does it do?
J
(c) How much heat does it give off in each cycle?
(d) What is the coefficient of performance of this engine when it works as a refrigerator between these two reservoirs?
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An 8.m, 220 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50° angle with the ground. How far up the ladder can an 770 N person climb before the la..
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