Question

To water the yard, you use a hose with a diameter of 3.3 cm. Water flows from the hose with a speed of 1.5 m/s.If you partially block the end of the hose so the effective diameter is now 0.72 cmcm, with what speed does water spray from the hose?

Answer 1

Ans: 31.5 m/s

Explanation:

Given ,

Diameter of the hose in the first case , d= 3.3 cm

speed of the water flow , v= 1.5 m/s

In the second case , diameter of the hose , d'= 0.72 cm

Let the speed of the water flow now is v'

Using equation of continuity , Av =A'v'

where , A and A' are the cross section of the hose for first and second case.

water will sprey from the hose with a speed of 31.5 m/s