Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. What statements would be true concerning this object?
-The object has a tangential acceleration only if the disk has an angular acceleration.
-If the angular speed is constant, the object must have constant tangential speed.
-If the disk has an angular acceleration, the object has both a centripetal and a tangential acceleration.
-The object always has a centripetal acceleration except when the angular speed is zero.