An object moving in a gravitational field is observed to speed up. Explain why.
A. The object has gained electrical potential energy.
B. The object is falling in the gravitational field, so it has gained kinetic energy.
C. The object has gained chemical potential energy.
D. The object is rising in the gravitational field, so it has lost kinetic energy.

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?

Which of the following best describes the circuit shown below?