is work performed when we apply more twist (torque) to change the radius of rotation of the bob? is the net acceleration still directed towards the axis of rotation?

Yes, work is performed as we apply more twist (torque) to change the radius of rotation of the bob. The net acceleration is still directed towards the axis of rotation.The torque that we add to the system is always perpendicular to the radius of rotation. The torque vector is always tangent to this radius vector, so when we increase the amount of torque applied by twisting harder, we cause a larger angle between torque and radius vectors. This means that there is more work done on the system (since more force was applied), and thus net acceleration towards the axis of rotation must increase.To learn more about torque visit: https://brainly.com/question/6855614#SPJ4