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An earth satellite revolves around the earth in a circular orbit at a height of 300km above the earth surface. If the radius of earth is 6400km, the velocity of satellite will be nearly: A. 8.1 km/s B. 7.7 km/s C. 3.5 km/s D. 2.4 km/s

An earth satellite revolves around the earth in a circular orbit at a height of 300km above the earth surface. If the radius of earth is 6400km, the velocity of satellite will be nearly:
A. 8.1 km/s
B. 7.7 km/s
C. 3.5 km/s
D. 2.4 km/s
 

Grade:12th pass

1 Answers

Vikas TU
14149 Points
one year ago
Let mass of satellite = m 
Distance b/n satellite and centre of earth , 
=> 6400+300 = 6700 
Centripetal force = Gravitational attraction 
GMm/r^2 = mv^2/r 
GM/r = v^2 
v^2 = sqrt(5.073 *10^10)
=> 7.72860 km/s 
Hope this helps 

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