Aboy on a skateboard is pushed down the sidewalk by a friend. the skateboard rolls for a while but eventually comes to a stop. what force is causing the skateboard to stop rolling?

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

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?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this