A fast pitch softball player does a "windmill" pitch moving her hand through a vertical circular arc to pitch a ball at 70mph. The 0.19 kg ball is 55 cm from the pivot point at her shoulder.

Just before the ball leaves her hand, what is its centripetal acceleration?

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

What occurs during a combustion reaction

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?