A block of wood weighs 40 N in air and 30 N in water. What is the buoyant force exerted by water on the block?
B = -F_g
= B-F_g
=30-40
= - 10N
Is this correct?
No, the calculation is not correct. To find the buoyant force exerted by water on the block, we need to use Archimedes' principle, which states that the buoyant force is equal to the weight of the fluid displaced by the object. The weight of the block in air and water gives us the necessary information.
To find the buoyant force, we need to subtract the weight of the block in water from the weight of the block in air.
Weight in air = 40 N
Weight in water = 30 N
Buoyant force = Weight in air - Weight in water
Buoyant force = 40 N - 30 N
Buoyant force = 10 N
Therefore, the correct answer is 10 N. The buoyant force exerted by water on the block is 10 N.