A girl rolls a bowling ball of mass 7.2 kg and a radius of 10.9 cm down a lane with a velocity of 6.6 m/s.  The moment of inertia of the bowling ball is I = 0.4MR2.  Find the rotational kinetic energy of the bowling ball, assuming it does not slip.

A girl rolls a bowling ball of mass 7.2 kg and a radius of 10.9 cm down a lane with a velocity of 6.6 m/s.  The moment of inertia of the bowling ball is I = 0.4MR2.  Find the rotational kinetic energy of the bowling ball, assuming it does not slip.

As shown in the figure, a given force is applied to a rod in several different ways.  In which is the torque about the pivot P due to this force the greatest? forces-torques.png

A grinding wheel is a solid, uniform disk of mass 2.50 kg and a radius 9.00 cm.  Starting from rest, what constant torque must a motor supply so that the wheel attains a angular speed of 126 rev/s in a time of 6.00 s.  (Idisk = (1/2)MR2)

Two equal forces are applied to a door.  The first force is applied at the midpoint of the door; the second force is applied at the doorknob.  Both forces are applied perpendicular to the door.  Which force exerts the greater torque?

A grinding wheel is a solid, uniform disk of mass 2.50 kg and a radius 9.00 cm.  Starting from rest, what constant torque must a motor supply so that the wheel attains a angular speed of 126 rev/s in a time of 6.00 s.  (Idisk = (1/2)MR2)

When a rigid body rotates about a fixed axis all the points in the body have the same linear velocities, but different angular velocities.

A boy and a girl are riding on a merry-go-round that is turning.  The boy is twice as far as the girl from the merry-go-round’s center.  If the boy and girl are of equal mass, which statement is true about the boy’s moment of inertia with respect to the axis of rotations?

Consider a particle which is moving clockwise at a constant speed v in a circle of radius R centered at the origin of the coordinate system.  When the particle is at point P, which vector best represents the velocity? move-cw-circle.png

A girl rolls a bowling ball of mass 7.2 kg and a radius of 10.9 cm down a lane with a velocity of 6.6 m/s.  The moment of inertia of the bowling ball is I = 0.4MR2.  Find the rotational kinetic energy of the bowling ball, assuming it does not slip.