Question

Water jet is coming out of a hose pipe of diameter 20cm with speed 20cm/s . It strikes a man inelastically. Find the force exerted by water jet on the person

Answer 1

The formula is :

F = density × area × velocity²

Convert v to m/s:

20/100 = 0.2

= 0.2 m/s

Density of water = 1000 kg/m³

Convert the diameter length to be in meters :

20/100 = 0.2

Area of the outlet :

3.142 × (0.2/2)² = 3.142 × 0.1² = 0.03142

Doing the substitution :

F = 1000 × 0.03142 × 0.2²= 1.2568N

Answer 2

Answer:

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