1. Two wheels having the same radius and mass rotate at the same angular velocity (Fig. 8-38). One wheel is made with spokes so nearly all the mass is at the rim. The other is a solid disk. How do their rotational kinetic energies compare?
(a) They are nearly the same.
(b) The wheel with spokes has about twice the KE.
(c) The wheel with spokes has higher KE, but not twice as high.
(d) The solid wheel has about twice the KE.
(e) The solid wheel has higher KE, but not twice as high.
2. If you used 1000 J of energy to throw a ball, would it travel faster if you threw the ball (ignoring air resistance?)
(a) So that it was also rotating?
(b) So that it wasn't rotating?
(c) It makes no difference.