# Calculate the Earth's gravity force on a 75 kg astronaut who is repairing the Hubble Space...

## Question:

Calculate the Earth's gravity force on a 75 kg astronaut who is repairing the Hubble Space Telescope 600 km above the Earth's surface and then compare this value with his weight at the Earth's surface. In view of your result, explain why it is said that astronauts are weightless when they orbit the earth in a satellite such as a space shuttle. Is it because the gravitational pull of the earth is negligibly small?

## Gravitational Force:

Gravitational forces, or simply gravity, is one of the four fundamental forces in the universe. Gravity acts between any two objects in the universe by virtue of their mass. Even if one cannot notice gravitational forces from other sources other than the Earth, these forces do, in fact, exist. For example, the other planets also exert a non-zero but negligible gravitational force on us.

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Given:

• {eq}\displaystyle \rm m = 75\ kg {/eq} is the mass of the astronaut
• {eq}\displaystyle \rm r = 600\ km = 600,000\ m {/eq} is the distance... Gravitational Pull of the Earth: Definition & Overview

from

Chapter 15 / Lesson 17
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Earth's gravitational pull is often misunderstood, but without it, life on Earth would be impossible. In this lesson, we'll define the gravitational pull and give some examples of how it is used. A quiz is provided to test your understanding.