Earth exerts a downward 1.5-N gravitational force on an apple as it falls toward
ID: 1624168 • Letter: E
Question
Earth exerts a downward 1.5-N gravitational force on an apple as it falls toward the ground.
What force does the apple exert on Earth?
Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is upward and negative value if the force is downward.
Compare the magnitudes of the accelerations of the apple and Earth due to these forces. The mass of the apple is about 150 g and the mass of Earth is about 6×1024kg.
Express your answer using one significant figure.
Compare the magnitudes of the accelerations of the apple and Earth due to these forces. The mass of the apple is about 150 g and the mass of Earth is about 6×1024kg.
Express your answer using one significant figure.
Explanation / Answer
A.
Using newton's third law:
Every action has equal and opposite reaction,
So force exerted by apple on earth = 1.5 N
force will be upward.
B.
acceleration of apple = F/Ma
a)apple = 1.5/(150*10^-3) = 10 m/sec^2
acceleration of earth = F/Me
a)earth = 1.5/(6*10^24) = 2.5*10^-25 m/sec^2
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