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प्रश्न
State the laws of flotation.
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उत्तर
Laws of flotation are,
- The weight of a floating body in a fluid is equal to the weight of the fluid displaced by the body.
- The centre of gravity of the floating body and the centre of buoyancy are in the same vertical line.
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संबंधित प्रश्न
State the principle of floatation.
A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if
(a) Some salt is added to water, (b) Water is heated?
Give reasons.
A test tube loaded with lead shots, weighs 150 gf and floats upto the mark X in water. The test tube is then made to float in alcohol. It is found that 27 gf of lead shots have to be removed, so as to float it to level X. Find R.D. of alcohol.
A rubber ball floats in water with 2/7 of its volume above the surface of the water. Calculate the average relative density of the rubber ball.
A cube of ice whose side is 4.0 cm is allowed to melt. The volume of water formed is found to be 58.24 cm3. Find the density of ice.
Explain the following:
An egg sinks in fresh water but floats in a strong solution of salt.
If you put one ice cube in a glass of water and another in a glass of alcohol, what would you observe? Explain your observations.
Hydrometer is based on the principle of ______.
Where do we use lactometers?
Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.
