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.

Power is work divided by time, so time = work ÷ power. Using the given values, t = (8.72 × 10⁶ J) ÷ (1.51 × 10⁴ W) ≈ 5.77 × 10² s. The answer is 5.77 × 10² s, choice B.

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