Question

a lawnmower engine running for 20 min does 4,560,000 j of work. what is the power output of the engine? (power: p = w/t)
3800 w
228,000 w
91,200,000 w
547,200,000 w

Explanation:

Step1: Convert time to seconds

Since 1 minute = 60 seconds, 20 minutes $t = 20\times60=1200$ s.

Step2: Use power formula

The power formula is $P=\frac{W}{t}$, where $W = 4560000$ J and $t = 1200$ s. So $P=\frac{4560000}{1200}=3800$ W.

Answer:

3800 W