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Q. A parallel-plate air capacitor is made from two plates 0.070 square, spaced 9.3 apart. What must the potential difference between the plates be to produce an energy density of ?

Q. A thin, rigid, spherical shell with a mass of 4.00 kg and diameter of 0.200 m is filled with helium at 0 degrees celsius and 1 atm pressure. It is then released from rest on the bottom of a pool of water that is 4.00 m deep.

A.) determine the upward acceleration of the shell.

B.) How long will it take for the top of the shell to reach the surface? disregard the frictional effects.

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