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. $\frac{Mn}{60}$
• B. $60Mn$
• C. $\frac{M}{60n}$
• D. $\frac{n}{60M}$

Answer 1

The correct option is A $\frac{Mn}{60}$

We are given that the disks of momentum $Mkg.m/s$ 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 $=M\times \frac{n}{60}$

So, Force associated with these discs in Newton is $\frac{Mn}{60}$