First slide

Fluid statics

Question

A copper sphere is dipped into water. Which of the following will be true?

Moderate

A

Buoyancy will be less at 0 ⁰C than at 4 ⁰C
B

Buoyancy will be more at 0 ⁰C than at 4 ⁰C
C

Buoyancy does not depend on temperature
D

No Buoyancy exist because of anomalous expansion of water

Solution

Buoyancy is equal to the weight of the liquid displaced $F_{B} = ρ_{w} Vg$
As density of water is maximum at 4 ⁰C, the Buoyancy is maximum at 4 ⁰C.

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