A Lawn Mower Has a 6-Horsepower Engine (1 HP =

Multiple Choice

A lawn mower has a 6-horsepower engine (1 HP = 750 W) . If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is

A) 1 800 J
B) 2 000 J
C) 2 200 J
D) 2 400 J
E) 2 250 J