Question

How long does it take a 1.51 × 104 W steam engine to do 8.72 × 106 J of work? Round your answer to three significant figures.

1.02 × 101 s
5.77 × 102 s
7.21 × 105 s
1.32 × 1011 s

Answer 1

t = W/P = (8.72×10^6 J)/(1.51×10^4 W) = (8.72/1.51)×10^2 s ≈ 5.77×10^2 s.

Answer: 5.77 × 10^2 s.