define critical velocity? derive an expression for critical velocity of satellite.
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CRITICAL VELOCITY OF SATELLITE:
- It is also known as the orbital velocity of a satellite orbiting around the planet.
- It is the stable velocity with which a satellite revolves around the planet in a circular trajectory.
DERIVATION OF THE EXPRESSION:
- When a satellite is revolving around the planet, gravitational force provides the centripetal component of the circular trajectory.
Let mass of planet be M and mass of satellite be m. Radius of trajectory be R+h , where R is the radius of planet.
[Hence derived].
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