A uniform disc of mass M =2.50 kg and radius `R = 0.20` m is mounted on an axle supported on fixed frictionless bearings. A light cord wrapped around the rim is pulled with a force 5 N. On the same system of pulley and string, instead of pulling it down, a body of weight 5 N is suspended. If the first processis termed A and the second B, the tangential acceleration of point P will be:

Options

A. equal in the processes `A` and `B`
B. greater in process `A` and `B`
C. greater in process `B` and than in `A`
D. independent of the two processes

Answer

B

Explanation

in (A) 5N force doing work only on pulley. So more 'd' and more `a-(1)=alphaR` for point P in (B) 5N force of gravity doing work on both man and pulley. So , less `alpha` and `a_(t)`.