a block of wood has a density of 0.6 g cm-3 is floating on a surface of water. What porion of wood is outside water
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We know that a floating body is pushed up with a force equal to the gravity of the displaced fluid.
Now the question is: What volume of water we need to displace in order to generate a force equal to the gravity of the cube?
The mass of the cube = V x Density=0,6kg
Gravity of the cube is approximately 60N so we need to find out what is the height of a water column with area 0,1 x 0,1 that has a gravity of 60N. Assuming water density 1g/cm3 you can calculate the height being 0,06m (6cm). The answer to the question is 4cm.
If is not clear I can write down on a piece of paper. Al you need to know to figure it out by yourself is Archimedes formula and Density formula.
Now the question is: What volume of water we need to displace in order to generate a force equal to the gravity of the cube?
The mass of the cube = V x Density=0,6kg
Gravity of the cube is approximately 60N so we need to find out what is the height of a water column with area 0,1 x 0,1 that has a gravity of 60N. Assuming water density 1g/cm3 you can calculate the height being 0,06m (6cm). The answer to the question is 4cm.
If is not clear I can write down on a piece of paper. Al you need to know to figure it out by yourself is Archimedes formula and Density formula.
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aritra
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