Physics, 14.11.2020 01:00 brianna5626

A space station has a mass M and orbits Earth in a circular orbit at a height above Earth’s surface. An astronaut in the space station appears weightless because the astronaut seems to float. Which of the following claims is true about the force exerted on the astronaut by Earth ? A) there is no force exerted on the astronaut by Earth because the astronaut is 400km above Earth’s surface

B) the force exerted on the astronaut by Earth is less than the force exerted by the astronaut because the astronaut is 400km above Earths surface

C) the force exerted on the astronaut by Earth is equal to the gravitational force of the space station that is exerted on the astronaut; the two equal forces balance to cause the astronaut to float.

D) the force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut

Please help me with this question if you can ! It would be very much appreciated . Thank you

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Answer from: tionnewilliams21

The claim from the options that is true about the force exerted on the astronaut by Earth is;

Option D; The force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut.

We are told that the astronaut experiences weightlessness in the space station. This is because he is moving around the earth under the influence of earth's gravitational force and is therefore in a state of 'free fall'.Now, the mass of the earth is much more larger than that of any astronaut. From newton's second law of motion, we know that;

Force(F) = Mass * Acceleration

Since the earth does not move but the astronaut moves, it means the force is sufficient to cause an acceleration of the astronaut but not sufficient to move the earth as the earth's mass is too big.

Thus, the same force exerted on the astronaut by the earth is same exerted on the earth by the astronaut.

Read more about force of gravity at; link

Answer from: angebaez91

The correct option is;

D) The force exerted on the astronaut by Earth is equal to the force exerted on Earth by the astronaut

Explanation:

According to Newton's third law of motion, in nature, for every action, there is an equal and opposite reaction, such that if a first object exerts a certain amount of force on a second object, the second object will exert a force of equal magnitude and opposite direction to that exerted by the first object

Therefore, the gravitational force exerted by Earth on the astronaut, is equal to the force exerted by the astronaut on Earth.

Answer from: Quest

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

Answer from: Quest

that the claims meet official rules.

don't misinterpret the claims

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A space station has a mass M and orbits Earth in a circular orbit at a height above Earth’s surface....

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