Aparticle with mass m is confined to move on a circle of radius r. it is perturbed by a potential v(0)a(1+cos(20). (a) what are the unperturbed energy levels? (b) find the shift in the energy levels to first order in a c) find the second order energy shift for all the states. hint: beware of the special care needed for some of the states.

The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator  -strong, steady winds

The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)