You are provided with a tall beaker containing water and a test-tube fitted with a millimetre scale extending over its entire length. Put sufficient lead shots into the test-tube and then put it into the tall beaker containing water. Add a few more lead shots into the test-tube until it just floats vertically. Keep the floating test-tube away from the side of the beaker, then, using the millimetre scale fitted into the test-tube, measure and record the height of the test-tube that is submerged in water. Label this height as $h_0$. Then drop four (4) of the clips provided into the test-tube, measure and record the new height of the test-tube that is submerged in water and label this new height as $h_4$. Repeat this procedure of dropping clips to obtain five more new heights by, each time, adding four (4) more clips to make 8, 12, 16, 20 and 24 clips respectively. Label these new heights as $h_8$, $h_{12}$, $h_{16}$, $h_{20}$ and $h_{24}$ respectively. Record your results in a tabular form as indicated below: (a) Plot a graph of $C_x$ against $h_y$ (first column against third column). (b) Determine the slope, S, of your graph. (c) Measure and record the external diameter, D, of the test-tube used in your experiment. (d) Find the value of $\frac{4Sm}{D^2}$ where m is the average mass in grammes of a clip.

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