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A jet of water with cross section of 6 c...

A jet of water with cross section of `6 cm^(2)` strikes a wall at an angle of `60^(@)` to the normal and rebounds elastically from the wall without losing energy. If the velocity of the water in the jet is `12 m//s`, the force acting on the wall is

A

`0.864 Nt`

B

`86.4 Nt`

C

`72 Nt`

D

`7.2 Nt`

Text Solution

Verified by Experts

The correct Answer is:
B
m=mass striking per sec to wall = `rhoAv`
Linear momentum transferred to wall per second
`=2xxm.vxxcos60^(@)=2Arhov^(2)cos60^(@)`
Linear momentum transferred to wall per second `= 86.4Nt`
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