The human heart is a powerful and extremely reliable pump. each day it takes in and discharges about 7300 l of blood. assume that the work done by the heart is equal to the work required to lift that amount of blood a height equal to that of the average citizen of atlantic falls, approximately 1.6 m. the density of blood is 1050 kg/m3. what is the heart's power output in watts?

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

What is the specific heat of wood ?

Mr. polifka does a demonstration in science class. he holds an unlit match six inches above a candle flame. after a while, the match bursts into flame.