Question

A flat disc of mass 0.6 kg and a radius 0.2 m lies on a frictionless horizontal table. A string wound around the cylindrical surface of the
disc exerts a force of F = 3 N in the direction shown in (fig.). Calculate length (in m) of the string that is unwound in 2 second. If your
answer is N fill value of N/4.
F
B-
O

Answer 1

Answer:

Explanation:

If instantaneous centre of rotation is P at a distance r from the centric line OC, then from the definition of instantaneous centre of rotation, the velocity of point P should be zero.

v  p  =4−10r=0 r=  2 /5

​  

m=0.4m

So, instantaneous centre of rotation is at distance 0.2 m from O (below O) on line OC.