A plastic ball in a liquid is acted upon by its weight and by a buoyant force. T

Question

A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4.4 N. The buoyant force has a magnitude of 8.4 N and acts vertically upward. An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to:        A) 4.0 N, downward
       B) 4.4 N, upward
       C) 8.4 N, upward
       D) 4.0 N, upward
       E) 8.4 N, downward 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.
       E) When you push down on the earth, you make it moving away from you so that it appears that you are in the air. A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4.4 N. The buoyant force has a magnitude of 8.4 N and acts vertically upward. An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to:        A) 4.0 N, downward
       B) 4.4 N, upward
       C) 8.4 N, upward
       D) 4.0 N, upward
       E) 8.4 N, downward

Explanation / Answer

answer 1 :

A: 4 N downward

external force + weight = buoyant force

answer 2 :

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.

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