Take a hollow plastic ball (dia 3cm to 5cm). Using a needle pass a thread of about 105cm along a diameter of the ball. Tie a knod at one end. Hanging a ball from a rigid support so that the body is free to oscillate.make a small hole(5mm dia) in that ball near the top . Fill with sand and find the time period of oscillation.empty the ball and fill with steel ball iron filling and repeat the experiment. Similarly carry out the experiment with common salt. Compare the time period obtained in the three cases. What do you find ? Explain your finding.
This is excellent! I am impressed at the quality of the work. Would it be OK if I send you a list of minor changes to be made in early March? You can then provide me quote and I will pay for the requested changes.