A human heart can average a blood flow of 0.015 m/s during an aortal contraction. If a person's heartbeat is 70 beats/minute, what is the wavelength of the blood created by the contractions (in meters)?

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?