Question

what constant torque should be applied to a disc of mass 16 kg and 0.5 m diameter so that it acquires and angular velocity of 4 Pi Radian/s in 8 seconds? the disk is initially at rest and rotates about an Axis through the centre of desk and in a plane perpendicular to the disc.

Answer 1

torque =force×perpendicular distance

1 kgf =1 kg
1kgf=10 newton
so,16kg= 16×10=160newton
distance=o.5 m
0.5×160=80 newton meter