Question

An object hangs from a spring balance. The balance indicates 30 N in air, 20 N when the object is submerged in water. Which of the following is true? A. The actual weight of the object is 20 N. B. The actual weight of the object is 10 N. c. The actual weight of the object is slightly more than 30 N, due to the buoyant force of the air. D. The actual weight of the object is slightly less than 30 N, due to the buoyant force of the air. E. The actual weight of the object is equal to the apparent weight of the object in both cases.

Answer 1

Given:

The reading of the scale in air, W_a=30 N

The reading of the scale in water, W_w=20 N

To find:

Which of the given statements is true?

Step-by-step explanation:

The buoyant force is an upward force acting on the object submerged in a fluid. The buoyant force is equal to the weight of the fluid displaced due to the submerged object.

This upward force acting on the object causes it to weigh less.

Thus the weight of the object is slightly more than 30 N.

Final answer:

Thus the correct answer is option C.