(a) State the law of floatation(b) Figure 13 shows a simple hydrometer.(i) State the purpose of the lead shots in the glass bulb(ii) How would the hydrometer be made more sensitive?(iii) Describe how the hydrometer is calibrated to measure relative density.(c) Figure 14 shows a cork floating on water and held to the bottom of the beaker by a thin thread.(i) Name the forces acting on the cork(ii) Describe how each of the forces mentioned in (i) above changes when water added into the beaker until it fills up.
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