Question

How long does it take a 1.51 × 10^4 W steam engine to do 8.72 × 10^6 J of work? Round your answer to three significant figures. 1.02 × 10^1 s 5.77 × 10^2 s 7.21 × 10^5 s 1.32 × 10^11 s

Answer 1

Answer:

5.77 × 10^2 s

Explanation:

Power is defined as the amount of work done divided by the tima taken to do that work:

$P=\frac{W}{t}$

where W is the work done and t the time taken.

In this problem, we have:

- the power: $P=1.51 \cdot 10^4 W$

- the work done: $W=8.72 \cdot 10^6 J$

So we can re-arrange the previous equation to find the time taken:

$t=\frac{W}{P}=\frac{8.72 \cdot 10^6 J}{1.51 \cdot 10^4 W}=5.77\cdot 10^2 s$

Answer 2

Answer:

B) 5.77 × 10^2 s

Explanation: