Which of the following statements is TRUE about heart rate and exercise?

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?