Distinguishing between sunspots, solar flares, and prominences drag descriptions to the correct category

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and