5. What is the net force in the following two situations? Situation &
Situation B
norm= 3 N
Fnorm =
= 3N
Ffrict= 5 N
= 5 N
Fapp
Ffrict= 5 N
Fgray= 3 N
Foray= 3 N

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

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?

Identify some abiotic characteristics of the tundra biome.