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Q. The electric potential at the surface of a uniformly charged sphere is 430 V. At a point outside the sphere at a (radial) distance of 18.0 cm from its surface, the electric potential is 165 V. (The potential is zero very far from the sphere.) What is the radius of the sphere, and what is the charge of the sphere?

Q. A high diver of mass 65.0 kg jumps off a board 10.0 m above the water. If her downward motion is stopped 1.70 s after she enters the water, what average force did the water exert on her?

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