Question

A horse pulls a cart with a force of 180.0 N at and angle of 33.0° with respect to the horizontal and moves along at a speed of 11.0 km/hr. How much work does the horse do in 8.6 min?

What is the average power of the horse?

Answer 1

Vo = 11km/h = 11,000m/3600s = 3.056 m/s.

d=r*t=3.056m/s * 8.6min * 60s/min=1577 m

Work = F*d = 180*cos33 * 1577 = 238 J.

Power = F*V = 180*cos33 * 3.056 =
461.3 J./s = 461.3 Watts.

Answer 2

Correction:
Work = 180*cos33 * 1577 = 238,065 J.