Suzy designed an experiment to test what type of cup could be used to boil water using heat energy from the sun. which cup design do you think worked best? (note: all the cups were the same size and shape)
a) a clear plastic cup.
b)a white ceramic cup.
c)a metal cup with a glossy, black surface.
d) a metal cup with a matte, black surface.

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?