If an automobile engine delivers 40.2 hp of power, how much time will it take for the engine to do 5.90 ✕ 105 J of work? (Hint: Note that one horsepower, 1 hp, is equal to 746 watts.)

Answer 1

P = 40.2hp * 746W/hp = 29,989 Watts. =
29,989 Joules/s.

T = 5.9*10*5J/(2.9989*10^4J/s=19.67 s.