One cubic metre of iron weighs 7800 kg. The weight of iron in a pipe of length 4 m, whose interior and exterior diameters measure 10 cm and 12 cm respectively, is nearly
Question and options
One cubic metre of iron weighs 7800 kg. The weight of iron in a pipe of length 4 m, whose interior and exterior diameters measure 10 cm and 12 cm respectively, is nearly
- 108 kg
- 118 kg
- 78 kg
- 88 kg
Answer and explanation
Correct answer: A - 108 kg
Volume of iron = pi(0.06^2 - 0.05^2) x 4 = pi x 0.0044 = about 0.01382 m^3. Weight = 0.01382 x 7800 = about 107.8 kg, so nearly 108 kg.
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