Question

A horse exerts a force of 200N to pull the cart. If the horse cart system moves with velocity 36kmh-1 on the level road,then find the power of horse in term of horse power (1hp= 746W)

Answer 1

Answer:

1/373 HP

Explanation:

Derivation

Let work be W.

Let force be F.

Let displacement be s

Let the time be t

We know that W = ( F × s ) / t

  Also s / t = velocity

  ==> W = F × v ..(1)

We know that power = W / t

W = F × v [ from 1 ]

 = 200 N × 36 km/hour

 = 7200 J

P = W / t

= 7200 J / 1 hour

= 7200 J / ( 60 × 60 ) s

= 7200 J / 3600 s

 = 2 W

We know that :

I HP = 746 W

==> 1 W = 1/746 HP

==> 2 W = 1/373 HP

The power is 1/373 HP or 0.00268 H.P