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Question

A number of disks each of momentum M kg.m/s are striking a wall at the rate of n disks per minute . The force associated with these discs in newtons would be :

A
Mn60
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B
60Mn
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C
M60n
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D
n60M
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Solution

The correct option is A Mn60

We are given that the disks of momentum M kg.m/s collide at the rate of n/min

Assume that, each disk travels with velocity v m/s, then they strike at the rate of n/60 and momentum transferred =M×n60

So, Force associated with these discs in Newton is Mn60


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