Aparallel-plate capacitor with plates of area 540 cm2 is charged to a potential difference v and is then disconnected from the voltage source. when the plates are moved 0.6 cm farther apart, the voltage between the plates increases by 100 v. what is the charge q on the positive plate of the capacitor?

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.