(g) For the previous situation, the average velocity of the rock during the firs
ID: 1489194 • Letter: #
Question
(g) For the previous situation, the average velocity of the rock during the first 22.0s of flight is closest to
A. 10m/s
B. 12m/s
C. 14m/s
D. 16m/s
E. 18m/s
(h) Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A. It is the upward force exerted by the ground that pushes you up, but this force can never exceed your weight.
B. You are able to spring up because the earth exerts a force upward on you which is stronger that the downward force you exert on the earth.
C. Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself which propels the body into the air.
D. When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air.
E. When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up if F1 > F2, and this is so because F1 is to F2 as the earth’s mass is to your mass.
(i) If you were to move into outer space far from any stellar objects,
A. Your mass would change, but your weight would not change.
B. Your weight would change, but your mass would not change.
C. both your weight and mass would change.
D. neither your weight nor mass would change.
E. none of these is true
Explanation / Answer
(h)
D. When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air.
(i)
B. Your weight would change, but your mass would not change.
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