Q. 6

Expert-verified
Found in: Page 177

### 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. How much force does an astronaut exert on his chair while sitting at rest on the launch pad? b. How much force does the astronaut exert on his chair while accelerating straight up at

a. Force exerted by the astronaut while sitting on chair at rest on the launch pad is

b. Force exerted by the astronaut while accelerating straight up is

See the step by step solution

## Part (a) Step 1 : Given information

An astronaut is sitting on his chair while at rest on the launch pad.

## Part (a) Step 2 : Calculation

The acceleration due to gravity is taken as,

Weight is the force that gravity will exert on him to keep him on the earth, it is the same force which he exerts on the chair.

And it is given by :-

## Part (a) Step 3 : Final answer

Force exerted by the astronaut while sitting on chair at rest on the launch pad is

## Part (b) Step 4: Given information

The astronaut on chair is accelerating at

## Part (b) Step 5 : Explanation

Acceleration while going straight up,

Here the acceleration will be due to net force of forces like gravity and the reaction force of the chair . Let it be R . Acceleration at which moves straight up by

Net force acting on him will be R - mg .

## Part (b) Step 6 : Final answer

Reaction Force of chair on the astronaut is 1584 N . Hence force on the chair by astronaut will also be 1584 N.