A solid metal sphere is fully submerged in seawater. The upthrust acting on the sphere depends on which of the following?

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Question

A solid metal sphere is fully submerged in seawater. The upthrust acting on the sphere depends on which of the following?

Accepted Answer

The density of seawater and the volume of the sphere — Upthrust = weight of fluid displaced = ρ_fluid × V_object × g. It therefore depends on the density of the fluid and the volume of the submerged object. Option B is wrong because the mass of the sphere does not determine upthrust; depth (for incompressible liquids) does not significantly affect upthrust either. Option C is wrong because the weight of the sphere determines whether it sinks or floats, not the upthrust itself. Option D is wrong because it is volume, not surface area, that determines the displaced fluid.

Answer

The mass of the sphere and the depth of submersion

Answer

The density of seawater and the volume of the sphere

Answer

The weight of the sphere and the temperature of the seawater

Answer

The surface area of the sphere and the density of the sphere

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