A cubic wood block with density of 0.6 * 10 ^ 3kg / m3 and side length of 10cm was immersed in water If the maximum tension that the rope can bear is 3N (G is 10N / kg) Inject water into the container (the water does not overflow until the water stops immediately before the rope breaks). At this time, the volume of the wood block immersed in the water is
Mass of block = 0.6kg, gravity = 6N
If the rope is to be broken, the buoyancy is greater than the pull of gravity and rope, that is, f floating ≥ gravity + 3, f floating ≥ 9N
And f-floating = ρ GV, so v = f-floating / ρ g = 9N / (1.0x10 ^ 3x10) = 0.9x10 ^ - 3M & # 179;
Therefore, when the volume of wood immersed in water exceeds 0.9x10 ^ - 3M, the rope will break
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