Suzie stands on a pedestal and touches the dome of a running van de graaf generator. in a few seconds she observes her hair standing on end. explain this observation.

a)
each hair was induced with a positive charge. each hair repels against its neighbor and stands up.

b)
each hair was induced with a positive charge. each hair is attracted to its neighbor and stands up.

c)
half of suzie's hairs were charged negative, and the other half charged positive. the different charged hairs repel each other and stand up.

d)
half of suzie's hairs were charged negative, and the other half charged positive. the different charged hairs attract to each other and stand up.

In the middle of the night you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of your rich uncle. the top of the fence is 5.00 m above the ground. you have taped an important message to a rock that you want to throw over the fence. the ground is level, and the width of the fence is small enough to be ignored. you throw the rock from a height of 1.60 m above the ground and at an angle of 54.0 degrees above the horizontal. part a part complete what minimum initial speed must the rock have as it leaves your hand to clear the top of the fence? express your answer with the appropriate units. part b for the initial velocity calculated in the previous part, what horizontal distance beyond the fence will the rock land on the ground?