In case 1, one end of a horizontal plank of mass m and length l is attached to a wall by a hinge and the other end is held up by a wire attached to the wall. in case 2 the plank is half the length but has the same mass as in case 1, and the wire makes the same angle with the plank. in which case is the tension in the wire biggest?
a. case 1
b. case 2
c. same

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If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.