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Q.

A jet of water with a cross sectional area ‘a’ is striking against a wall at an angle θ  to the horizontal and rebounds elastically. If the velocity of water jet is v and the density is ρ , the normal force acting on the wall is

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a

2avρcosθ

b

avρcosθ

c

2av2ρcosθ

d

avcosθ

answer is A.

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Detailed Solution

Question Image 

F=macc=A.l.ρ.Δvt

F=A.ρ.v2  =Alt ρ.vcosθ(v=vcosθ)

F=Avρ2vcosθ

∴F=2Aρv2cosθ

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