hai swings a ball in a vertical circle at the end of a string that always remains taut. at the top of the circle, the centripetal force on the ball is

Asher cycles 12 miles in 16 hours. what is his speed?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?