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

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

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Applied Mechanics and Graphic Statics
The angle of friction is:

The force of friction at which the body is just about to move
The ratio of the friction and the normal reaction
The angle between the normal reaction and the resultant of normal reaction and limiting friction
The force of friction when the body is in motion

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