A satellite in a circular orbit of radius R has period T. For radius 4R, period is MCQ with Answer and Explanation

Explanation:
By definition, a force is conservative if the work done by it on an object moving between two points is completely independent of the path taken. A direct consequence of this is that the total work done by a conservative force (like gravity or electrostatic force) in moving an object around a closed loop (returning to the starting point) is exactly zero.

Explanation:
u = -20, f = -10. Mirror formula: 1/f = 1/v + 1/u => 1/(-10) = 1/v + 1/(-20) => -1/10 = 1/v - 1/20 => 1/v = -1/10 + 1/20 = -1/20 => v = -20 cm, image at C.

Explanation:
Horizontal line, slope zero.