Suppose a yo-yo has a center shaft that has a 0.250 cm radius and that its string is being pulled.

(a) if the string is stationary and the yo-yo accelerates away from it at a rate of 1.50 m/s2, what is the angular acceleration of the yo-yo?
(b) what is the angular velocity after 0.750 s if it starts from rest?
(c) the outside radius of the yo-yo is 3.50 cm. what is the tangential acceleration of a point on its edge? ans:

(a) 600 rad/s2,
(b) 450 rad/s,
(c) 21.0 m/s

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.