An object hangs from a spring balance.The balance indicates 30 N in air, 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that is half of water?
A)20 N
B)25 N
C)30 N
D)35 N
E)40 N

Question

Quizplus · Accepted Answer

The buoyant force on an object is equal to the weight of the displaced fluid. Since the density of the liquid in question is half of water, the buoyant force will be half of what it was in water. Therefore, the balance will indicate a weight of 25 N (20 N + 5 N = 25 N).

An Object Hangs from a Spring Balance