What is the buoyancy of a cubic kilogram of wood with a mass of 1kg and a density of 0.4 * 10 I first calculate the volume of the block, and then f = ρ, GV = 24.5n. Why is it wrong?

What is the buoyancy of a cubic kilogram of wood with a mass of 1kg and a density of 0.4 * 10 I first calculate the volume of the block, and then f = ρ, GV = 24.5n. Why is it wrong?

The density of wood is less than that of water. It floats in the water. What you calculate is the buoyancy when the wood is completely immersed in the water, so it's not right
F=G
=mg
=1kg by 10N / kg
=10N

What is the buoyancy of a wood block with a mass of 0.5 kg and a density of 600 kg per cubic meter when it is still in water

In fact, the buoyancy of the wood is equal to the gravity of the wood itself. You can see the key words of balance. If you think about it, you will know that it is only affected by gravity and buoyancy. Therefore, the buoyancy is 0.5 * 9.8 = 4.9n

When a wood block with a mass of 0.5kg and a density of 0.6 × 10 ＾ 3kg / m3 is still in water, its buoyancy is

The buoyancy at rest is equal to gravity
That's 0.5 * 9.8 = 4.9n