16) If a person falls from a 16 ft diving board, with what velocity does he strike the water? a) 32 ft/s*2 b) 8 ft/s c)32 ft/s d) 16 ft/s 17) What force is exerted by the heart in propelling 1,610 g of blood from 0 to 1.4 m/sec in 1 sec? a) 1.5N b) 2Nc) 2.25 N d 3.75 N 18) In a “human centrifuge” with a 20 ft radius, a 160 lb test subject blacked out on reaching a velocity of 60 ft/sec. What is the value of the centripetal force? a) 1000 ft-lb b)600 ft-lb 750 ft-lb d) 900 ft-lb 19) If blood rising through 20 cm of vena cava was found to have a constant velocity of 140 cm/ sec, by what amount must the blood be accelerated upward to maintain this velocity against gravity? a) 980 cm/s2 b) 32 ft/ sA2 c20 cm/s2 d) both a and b 20) If gravity were eliminated and other factors kept constant, what would be the speed of the blood at the blood at the upper end of the 20 cm distance? a) 140 cm/s*2 b) 242 cm/s2 c) 50 cm/s 2 ) 200 cm/ s 2 21) A heart at low level of activity ejected 6.4 lb of blood at a velocity of 1 ft/sec. Calculate the kinetic energy a) 0.1 J 22) A heart at high level activity ejected 12.8 lb of blood at a velocity of 2 ft/sec. Calculate the kinetic energy a) 10 J 23) After going down a ramp in a wheelchair, a patient realizes that he is going too fast in the corridor b) 0.8 J c) 10J d) 5 J b)0.8 J c) 0.1 J d) 0.9 J and stops the chair by braking it with his hands. If the patient and the chair weigh 200 lb and if he applies a force equal to the same weight, coming to stop in 4 ft, what was his original speed? a)5 ft/s 24) In what time can a ½ ton, 6 HP elevator raise a passenger load of 650 lb to a distance of 20 ft? a) 10 s b) 100 ft/s c20fts d)16 ft/s b) 20 s c) 5 s