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A remote - sensing satellite of earth revolves in a circular orbit at a height of 0.25 × 106 m above the surface of earth. If earth's radius is 6.38 × 1066 m and g = 9.8 ms–2, then the orbital speed of the satellite is :
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- 8.56 km s–1
- 9.13 km s–1
- 6.67 km s–1
- 7.76 km s–1
Correct Option: D
Given : Height of the satellite from the earth's surface h = 0.25 × 106m
Radius of the earth R = 6.38 × 106m
Acceleration due to gravity g = 9.8 m/s2
Orbital velocity, Vo = ?
| = 7.76 km/s ∵ | = g | |
| R2 |
