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In sand casting of hollow part of lead, a cylindrical core of diameter 120 mm and height 180 mm is placed inside the mould cavity. The densities of core material and lead are 1600 kg/m³ and 11300 kg/m³ respectively. The net force (in N) that tends to lift the core during pouring of molten metal will be
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- 19.7
- 64.5
- 193.7
- 257.6
Correct Option: C
Net Buoyancy force, F
F = (11300 - 1600) × 9.81 × π/1 × (120)² × 180 × 10-3
= 193.71 N
