Consider an electron moving in a constant homogeneous magnetic field b b there are no other potentials present a) write down the hamiltonian (hint: canonical momentums a, where a is the vector potential b) show that if one chooses the vector potential that only has y-component, the general solution of the wave function has plane-wave form in two of the three directions. c) find the allowed energy levels

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.