A disc of mass 12 kg and radius 0.35 m is spinning with angular velocity
PHYSICS · Multi-part · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A disc of mass 12 kg and radius 0.35 m is spinning with angular velocity 45 rad s−1 .
Determine how many revolutions per minute (rpm) the disc is making.
(1) A force is applied to the rim of the disc in a direction that is tangential to the disc's circumference. Determine the magnitude of this force if the disc is to stop spinning after 4.0 s.
(2) Calculate the work done by the force in stopping the disc.
(3) What is the average power developed by the force?
(4) Calculate the number of revolutions made before stopping.