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N bullet each of mass mkg are fired with...

N bullet each of mass mkg are fired with a velocity `vms(-2)` at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

A

nmv

B

`(Nmv)/(n)`

C

`n(Nm)/(v)`

D

`n(Nv)/(m)`

Text Solution

Verified by Experts

The correct Answer is:
A
Total mass of bullets=Nm, time `t(N)/(n)` .
Momentum of the bullets striking the wall=Nmv
Rate of change of momentum (Force) `=(Nmv)/(t)=nmv` .
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Knowledge Check

  • A disc of mass 10 g is kept floating horizontal in the air by firing bullets, each of mass 5g, with the same velocity at the same rate of 10 bullets per second. The bullets rebound with the same speed in positive direction . The velocity of each bullet at the time of impact is (Take g = 9.8 ms^(-2))

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    D
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