A fire hose has a diameter of 2.5 cm and is required to direct a jet of water to a height of atleast 40 m....?

Question

A fire hose has a diameter of 2.5 cm and is required to direct a jet of water to a height of atleast 40 m. The minimum power (nearly) of the pump needed for this hose is (in kW) (Take g = 10 m/s2)

1. 21.5

2. 743

3. 1

4. 2.5

Answer 1

In this problem,the watt or kwatt is a problem of time to do the job,what you need to know is the speed of your pump.

V=R(omega),then Height=(-)(1/2)10T^2 + V0T.

GOOD LUCK.