A disc with radius 0.060 m and rotational inertia 0.061 kg.m^2has a rope wrapped around its parameter. The other end of the ropeis holding a 0.20 kg mass. The mass is held at 1.0 m above thefloor. You release the mass from rest. This causes the disc to spinand the mass to fall. How long does it take the mass to fall to theground?
Hint: use torque and angular acceleration.
A solid sphere of radius 0.13 m and mass 0.25 kg rolls down anincline plane without slipping. If the incline plane is 0.40 m talland has an angle of 24° then how long does it take the sphere toroll down the incline plane?
Hint: rotational inertia of a solid sphere is 2/5*(mr^2).
