a 4. A water jet, whose cross sectional area is 'a' strikes wall making an angle 'O' with the wall and rebounds elastically. The velocity of water of density 'd' is v. Force exerted on wall is :- e 0 V (1) 2 avềd coso (2) 2 avad sine (3) 2 avd coso (4) avd cose. please solve this problem
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Answer:
A water jet, whose cross sectional are is 'a' strikes a wall making an angle 'θ ' with the normal and rebounds elastically. The velocity of water of density 'd' is v. Force exerted on wall is
Explanation:
Correct option is
A
2av
2
d cosθ
v= velocity, d= density
V= volume
dt
dV
=av
F=
dt
dP
[P=momentum]
F=
dt
d(dV(2Vcosθ)]
=(2dvcosθ)
dt
dV
F=2 dvcosθav[
dt
dV
=av]
F=2av
2
dcosθ
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