Q. 19

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Found in: Page 354

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# A proposed space elevator would consist of a cable stretching from the earth’s surface to a satellite, orbiting far in space, that would keep the cable taut. A motorized climber could slowly carry rockets to the top, where they could be launched away from the earth using much less energy. What would be the escape speed for a craft launched from a space elevator at a height of ? Ignore the earth’s rotation.

The escape speed for the craft would be

See the step by step solution

## Step 1 : Given information

The craft is launched at a height of

## Step 2 : Calculation

The expression for escape velocity is given by :

Where, 'v' is escape velocity.

'G' is the universal gravitational constant.

'M' is the mass of the earth.

'R' is the radius, here 'R' is (R + h).

Substituting the values of G, M, R, h in the above equation. And solving for 'V' we get :

## Step 3 : Final answer

The escape speed for the craft would be