A car is moving around a circular track of radius 25m with a speed of 30 m/s. What is the centripetal acceleration of the car? * A 72 m/s2
B 36 m/s2
C 30 m/s2
D 6 m/s2

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.