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(a) State the condition necessary for a body to float in a fluid.
(b) A ship made of steel is observed to float on water yet the density of steel is approximately
eight times that of water. Explain this observation.
(c) Figure 17 shows three stages of an experiment to determine relative density of cork which normally floats on water. To make a sinker hang below the cork.
In (I) a spring balance is used to measure the weight W of the cork in air.
In (II) the spring balance is used to measure the apparent weight W1, when only the sinker is submerged in water.
In (III) the spring balance is used to measure the apparent weight W2 when both cork and sinker are submerged.
W=0.08N
W1=0.60N
W2=0.28N
Use the information to determine the:
(i)upthrust on cork.
(ii)relative density of cork.