The critical speed of an artificial satellite is_______________?
Correct answer: C. 7.9 Kms-1
- A. 8 Kms-1
- B. 8.1 Kms-1
- C. 7.9 Kms-1
- D. 8 ms-1
Explanation
The speed needed for a low Earth satellite is v = √(GM/r), which gives approximately 7.9 km s-1 near Earth's surface. This speed provides the centripetal acceleration needed for circular orbit. Students may choose 8.1 km s-1 by using an over-rounded or slightly different orbital radius.
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Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
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