An aluminium sphere is dipped into water at $15^{\circ} C (γ_{a l u m i n i u m}$ = $69 \times 10^{- 6} /^{\circ} C; γ_{w a t e r} = 214 \times 10^{- 6} /^{\circ} C)$ . If the temperature is increased, the force of buoyancy:

will increase

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will decrease

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will stay the same

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will increase or decrease depending on the radius of the sphere

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Solution

The correct option is B
will decrease

Comparing the given values, as $γ_{a l u m i n i u m} < γ_{w a t e r}$ ,an apparent shrinkage of the aluminium will take place with respect to water; hence the buoyancy force will decrease.

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An aluminium sphere is dipped into water at $15^{\circ} C (γ_{a l u m i n i u m}$ = $69 \times 10^{- 6} /^{\circ} C; γ_{w a t e r} = 214 \times 10^{- 6} /^{\circ} C)$ . If the temperature is increased, the force of buoyancy:

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A) increase
B) be unchanged
C)Decrease
D) Increase or decrease depending on the numerical valves of coefficient of expansion of water and iron.

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An aluminium sphere is dipped into water at 15∘C(γaluminium = 69 × 10−6/∘C;γwater=214 × 10−6/∘C). If the temperature is increased, the force of buoyancy:

The correct option is B will decrease Comparing the given values, as γaluminium<γwater,an apparent shrinkage of the aluminium will take place with respect to water; hence the buoyancy force will decrease.

An aluminium sphere is dipped into water at $15^{\circ} C (γ_{a l u m i n i u m}$ = $69 \times 10^{- 6} /^{\circ} C; γ_{w a t e r} = 214 \times 10^{- 6} /^{\circ} C)$ . If the temperature is increased, the force of buoyancy:

The correct option is B
will decrease

Comparing the given values, as $γ_{a l u m i n i u m} < γ_{w a t e r}$ ,an apparent shrinkage of the aluminium will take place with respect to water; hence the buoyancy force will decrease.