Question

An engine pumps water through a hose pipe water passes through the pipe and leaves

Answer 1

As discussed in

Power if the force is constant -

P=frac{dw}{dt}= P= vec{F}cdot vec{v}

- wherein

vec{F}

ightarrow force

vec{v}

ightarrow velocity

Mass per unit length of water, \mu = 100 kg/m

Velocity of water V= 2m/s

Power of the engine P = \mu v^{3} = (100)\times (2)^{3}

P = 800 W

Option 1)

400 W

This solution is incorrect

Option 2)

200 W

This solution is incorrect

Option 3)

100 W

This solution is incorrect

Option 4)

800 W

This solution is correct