Gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. what effect does this have on collisions?

the change in momentum needed to stop the gymnast is increased.

the change in momentum needed to stop the gymnast is decreased.

the force exerted by the floor on the gymnast decreases.

the force exerted by the floor on the gymnast increases

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0

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.