Question

A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.

Answer 1

Given force F = 300 N, u = 18 km/hr

Now, power = `"W"/"t" = "F.s"/"t"` = F.v

or P = 300 x `(18 xx 10³)/(60 xx 60)` = 1500 watt

Now 1 H>P = 746 watt

1500 watt = 2 H>P (approx)