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A cube wood block with a density of 0.6 × 10 ᦉ kg / m ᦉ 179; and a side length of 10 cm is still on the water surface (1) The gravity on the block (2) Buoyancy of wood block (3) At least how much force must be applied on the surface of the block to make it completely immersed in water. (g = 10N / kg)
（1）G=pvg=0.6×10³*0.1^3*10=6N
(2) When floating, according to the condition of sinking and floating, f floating = g object = 6N
(3) The buoyancy of the wood block is f = 1.0 * 10 ^ 3 * 0.1 * 3 * 10 = 10N when it is completely immersed in water
In this case, F + G = f is obtained from the equilibrium condition
F = F-G = 10-6 = 4N
A force of at least 4N must be applied to the surface of the block to make it completely immersed in water
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