Question

take a hollow plastic ball (dia 3 cm to 5 cm ) .using a needle pass a thread of about 105 cm along a diameter of the ball .tie a knot at one end .hang the ball from a rigid support so that the ball is free to oscillate.make a small hole(5mm dia )in the ball near the top .fill it with sand and find its time period of oscillation .empty the ball and fill it with steel balls /iron filings and repeat and experiments .similarly carry out the experiment with common salt .compare the time periods obtained in the above three cases

Answer 1

very lengthy question it is ...