Applied Mechanics and Graphic Statics
The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface

Gravity of the sun and the moon
None of these
Uneven distribution of the gravitational field
Aerodynamic forces

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Friction force acting when the body is in motion
Friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
Angle between normal reaction and resultant of normal reaction and limiting friction

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