Chegg a “black hole” theoretically has an escape velocity that is greater or equal to the velocity of light (3 x 108 m/s). it the effective mass of the black hole is equal to the mass of the sun (2 x 1030 kg), what is the effective “radius” (called the “schwarzschild radius” of the black hole

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?