The center of mass of a pitched baseball or
radius 3.91 cm moves at 33.6 m/s. the ball
spins about an axis through its center of mass
with an angular speed of 52.1 rad/s.
calculate the ratio of the rotational energy
to the translational kinetic energy. treat the
ball as a uniform sphere.

You want to move a heavy box with mass 30.0 kg across a carpeted floor. you pull hard on one of the edges of the box at an angle 30∘ above the horizontal with a force of magnitude 240 n, causing the box to move horizontally. the force of friction between the moving box and the floor has magnitude 41.5 n . what is the box's acceleration just after it begins to move