A ball rolls without slipping down incline A, starting from rest. ...

[amal]

A ball rolls without slipping down incline A, starting from rest. At the same time, a box starts from rest and slides down incline B, which is identical to incline A except it is frictionless. Which has a larger translational speed at the bottom of the ramp?
  1.They have the same translational speed at the bottom of the ramp.
  2.the ball
  3.the box
  4.It is impossible to determine.

Question 2

A rod attached to the shaft of a motor at the center of the rod so that the rod is perpendicular to the shaft, as in figure a. The motor is turned on and performs work W on the rod, accelerating it to an angular speed . The system is brought to rest and the attachment to the rod is then moved along the shaft such that the rod is spun from its end instead, as in figure b. If the controls of the motor are adjusted such that the rod is accelerated from rest to the same angular speed of  in this new configuration, how much work does the motor do on the rod in this case?
 

[6ana001]

Answer to Question 1

3

Answer to Question 2

4