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Bernoulli's Principle

A yellow cyli...

Question

A yellow cylindrical pipe is made of iron. Its external and internal radii are 8 cm and 7 cm respectively and it is 35 cm long .If 1 $c m^{3}$ iron weight 8 g then the weight of the pipe is

A

13.25 kg

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B

13.2 kg

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C

13.26 kg

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D

13.21 kg

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Solution

The correct option is B 13.2 kg
Volume of material = $π (R^{2} - r^{2}) h$
= $\frac{22}{7} (8 + 7) (8 - 7) \times 35 c m^{3} = 1650 c m^{3}$
Weight = 1650 x 8 gm = 13200 gms = 13.2 kg

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