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An aluminium sphere of 20 cm diameter is...

An aluminium sphere of 20 cm diameter is heated from `0^@C` to 100 C. Its volume changes by (given that coefficient of linear expansion for aluminium `alpha_(Al)=23xx10^(-6)l^@C`)

A

28.9 cc

B

2.89 cc

C

9.28 cc

D

49.8 cc

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The correct Answer is:
B
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Apparent weights of a solid in a liquid are 50g" and " 52g " at " 25^(@)C " and " 75^(@)C respectively. If the coefficient of linear expansion of the solid is alpha_(s)=6.6 times 10^(-6@)C^(-1), " and " gamma for the liquid is 7.3 times 10^(-4@)C^(-1) , what is the real weight of the solid in air?

The length of the steel structure of a bridge is 0.5 km and it has to withstand temperature change from 44^(@)F to 116^(@)F . What allowance should be kept for its expansion if the coefficient of linear expansion of steel is 1 times 10^(-5@)C^(-1) ?

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