List of top Physics Questions on Free body diagram

Two equal heavy spheres, each of radius r, are in equilibrium within a smooth cup of radius 3r. The ratio of reaction between the cup and one sphere and that between the two spheres is \includegraphics[width=0.5\linewidth]32.png

Vapour pressure of pure 'A' is 70 mm of Hg at $25^{\circ}C$. It forms an ideal solution with 'B' in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at $25^{\circ}C$, the vapour pressure of pure 'B' at $25^{\circ}C$ is

Three equal masses M are placed at the vertices A, B, and C of an equilateral triangle. The net force acting on a unit mass placed at the centroid O is: