1.

A steam engine delivers 5.4 × 108 J of work per minute and serves 3.6 × 109 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute.

Answer»

η = w/q1 = 5.4 x 10/3.6 x 109 = 15%

Q2 = Q1 – W 

= 36 × 108 – 5.4 × 108 

= 30.6 × 108 J



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