9702/11/O/N/22 solved paper|Easy physics|sir saeed akhtar

A square board, of side length x, hangs freely from a nail P, as shown. The board has uniform thickness and is made from material of uniform density. A mass of 0.20 kg is suspended from the lower end of a light spring. A second mass of 0.10 kg is suspended from the first mass by a thread. The arrangement is allowed to come into static equilibrium and then the thread is cut. In an experiment to determine the acceleration of free fall g, the time t taken for a ball to fall through distance s is measured. The percentage uncertainty in the measurement of s is 2%. The percentage uncertainty in the measurement of t is 3%. A box, in the shape of a cube, falls from a ship into the sea. The box lands with its lower face level with the surface of the sea. A transverse wave travels along a rope. The diagram shows the rope at time t = 0. The wave is travelling from left to right. The period of the wave is T. A battery of electromotive force (e.m.f.) 6.0 V and negligible internal resistance is connected to a voltmeter and four other components, as shown. The voltmeter is connected between points X and Y. The positive terminal of the voltmeter is connected to X and the negative terminal of the voltmeter is connected to Y.