Question

9. A brick weighs 21 N. Measured underwater, it weighs 12 N. What is the

size of the buoyant force exerted by the water on the brick?
33 N
21 N
12 N
9N
1

Answer 1

9N

Step-by-step explanation:

The difference between the weight of the brick in air and the weight of the brick underwater is equal to the buoyant force exerted by the water on the brick.

Weight of the brick in air = 21 N

Weight of the brick underwater = 12 N

Therefore, the buoyant force exerted by the water on the brick is:

Buoyant force = Weight of the brick in air - Weight of the brick underwater

Buoyant force = 21 N - 12 N

Buoyant force = 9 N

So the size of the buoyant force exerted by the water on the brick is 9 N. Answer: 9N.

Hope this helps!