On a recent adventure trip, Anita Break went rock climbing. Anita was able to perform 1370 J of work in 100 seconds. Determine Anita's power rating during this portion of the climb

Power = (energy) / (time)

= (1370 joules) / (100 seconds)

= 13.7 joules/second

= 13.7 watts.

That's not an awful lot of power, especially for a strenuous activity like

rock-climbing. Shoot! Even I could probably perform at that level.

Compare 13.7 watts to the light power coming out of a 20-watt night light.

13.7 watts = 0.018 horsepower. (rounded)