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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
The Forces

Concepts Of Physics MCQ Edition [Volume 1] · Physics · The Forces

A geostationary satellite orbits at a distance of approximately...

A geostationary satellite orbits at a distance of approximately 36000 km36000 \text{ km} from the surface of the earth. Determine the weight of a 120 kg120 \text{ kg} equipment placed inside this satellite. The radius of the earth is 6400 km6400 \text{ km}.

Options

  1. A27 N27 \text{ N}
  2. B0 N0 \text{ N}
  3. C37 N37 \text{ N}
  4. D1176 N1176 \text{ N}

Correct answer

B. 0 N0 \text{ N}

Step-by-step solution

The weight of an object placed inside a satellite is its apparent weight, which is the normal reaction force exerted by the surface of the satellite on the object.

In an orbiting satellite, both the satellite and the equipment inside it are in a state of free fall towards the Earth.

The centripetal acceleration of the satellite and the equipment is provided entirely by the Earth's gravitational pull.

Let g′g' be the acceleration due to gravity at the orbit. The equation of motion for the equipment is mg′−N=macmg' - N = ma_c.

Since the satellite is in a stable orbit, ac=g′a_c = g'.

Substituting this, we get mg′−N=mg′mg' - N = mg', which gives N=0N = 0.

Thus, the equipment experiences weightlessness, and its weight inside the satellite is 0 N0 \text{ N}.
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