An astronaut goes out for a "space-walk" at a distance above the earth equal to twice the radius of the earth. What is her acceleration due to gravity?

Acceleration due to gravity will be .

Explanation:

We can use the gravitational force equation:

The F is equal to the weight of the astronaut, so we will have:

But the distance between the astronaut and the center of the earth is 2R, then we have:

Therefore the acceleration due to gravity will be .

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