The barometric height of a town is 70 cmHg. Given that the standard
atmospheric pressure is 76 cmHg
and the density of mercury is 13 600
kgm ?, determine the altitude of the
town. (Density of air is 125 kgm?)​

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

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?