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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A rocket takes off from Earth’s surface, accelerating straight up at 72.0 m/s2. Calculate the normal force acting on an astronaut of mass 85.0 kg, including his space suit.

To determine
The normal force acting on the astronaut.

Explanation

Given info: The mass of the astronaut is 85.0 kg. The acceleration of the rocket is 72.0ms2 .

The astronaut is acted upon by four forces – normal force and the force of gravity. The free body diagram is given below.

From the above diagram,

Nmg=ma

  • m is the mass of the astronaut.
  • g is the acceleration due to gravity.
  • a is the acceleration.
  • N is the normal force.

On re-arranging the terms,

N=m(a+g)

Substitute 85.0 kg for m, 72.0ms2 for a and 9

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