At rest, a post CBG x 3 patient with a cardiac output of 5.1…

At rest, a post CBG x 3 patient with a cardiac output of 5.1 liters per ECHO and 250 ml/min of oxygen consumption is taken by PT to do exercise stress testing. On the treadmill, the cardiac output is unable to get past 5.1 liters due to cardiac damage. Oxygen consumption increases from 250 ml/min to  350 ml/min. What does this tell you about the C(a-v)O2 value? 

4) The figure shows a 100-kg block being released from rest…

4) The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very light. (Extra credit)