Question

a wagon is pulled at speed of 40.0 m/s by a horse exerting 1800 newton horizonal force what is the power of horse

Answer 1

The power of horse is: P = 72000 W

Explanation:

Given

• F = 1800 N

• v = 40.0 m/s

To determine

P = ?

Using the formula

`\:\:\:P=\overrightarrow{F\cdot }\overrightarrow{v}`

The ⋅ in the formula represents a scalar product, defined by:

`\overrightarrow{v\cdot }\overrightarrow{w}=|v||w|cos\:\theta`

The angle Ф is zero because F and v are are parallel.

Thus the cosine is 1.

Therefore,

P = (1800) (40.0)

P = 72000 W

Hence, the power of horse is: P = 72000 W