Take a hollow palstic ball(dia 3cm to 5cm). Using a needle pass a thread of about 105cm 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 ossicillate. 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 the experiment. Simillarly carry out the experiment with common salt. Compare the time periods obtained in the above three cases. What do you find?explain your reading
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