A 2.0 micro farad capacitor is charged from a 6.0v battery. a) how much charge will it hold?
b) how much energy is stored on it?
c) where has that energy come from?
d) if the capacitor is then discharged. where does the energy go to?​

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

If element x has 99 protons how many electrons does it have

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant