Question

A cake of soap placed in a bathtub of water sinks. The buoyant force on the soap is:

a- Zero
b- Less than its weight
c- Equal to its weight
d- More than its weight

I believe is D for if the cake of soap sinks, it means that the specific gravity is more than 1, so it is more than its weight....RIGHT?

Answer 1

Actually, the correct answer is B - Less than its weight.

When an object sinks in water, the force of the water is not enough to support its weight. The buoyant force on the soap is less than its weight, which causes the soap to sink.