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a) A test tube of uniform cross section is loaded so that it can float upright in water.With an aid of a labelled diagram, describe how the test tube may be calibrated to measure the density of liquid
b) In an experiment to determine the density of a liquid, a uniform metal cylinder of cross section-
sectional area #6.2cm^2# and length 4.5cm was hang from a spring balance and lowered gradually into the liquid. The up thrust was determined for various submerged lengths. The results obtained are as shown on the graph in Figure 1.
Using the graph, determine:
i. The value of the up thrust when the cylinder is fully submerged.
ii. The density of the liquid.