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 than 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.
D
You might also like to view...
The best places for life to have formed on Earth are believed to have been
a. near the south pole on the ice. b. on the continent of Africa in the areas with no water. c. in liquid water, probably in the oceans or pools of water.
Energy in Capacitors: Measurements show that it takes 0.30 mJ of work to move 5.0-?C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant. What is the potential difference between the plates of this capacitor?
A. 60 V B. 81 V C. 55 V D. 23 V E. 0 V
An alpha particle (a helium nucleus, having charge +2e and mass 6.64 × 10-27 kg) moves head-on at a fixed gold nucleus (having charge +79e)
If the distance of closest approach is 2.0 × 10-10 m, what was the speed of the alpha particle when it was very far away from the gold? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.60 × 10-19 C) A) 2.3 × 105 m/s B) 4.6 × 105 m/s C) 2.3 × 106 m/s D) 4.6 × 106 m/s
Which of the following would be different for a person on the Moon rather than on Earth?
a. Weight b. Height c. Volume d. Mass