A body starts from rest and moves with uniform acceleration. The ratio of distances covered in 1st, 2nd, and 3rd seconds is MCQ with Answer and Explanation

Explanation:
Sound waves are mechanical, require medium.

Explanation:
J.J. Thomson proposed plum-pudding: positive sphere with embedded electrons. Rutherford disproved by gold foil experiment, proposed nuclear model. Bohr added energy levels. Dalton solid sphere.

Explanation:
Work is defined as W = F.d.cos(θ). For a satellite in a circular orbit, the gravitational force acts as the centripetal force, directing entirely towards the center of the Earth. The displacement of the satellite at any instant is tangential. Since the angle between force and displacement is exactly 90°, cos(90°) = 0, meaning zero work is done.