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प्रश्न
Why does a helium balloon float in air?
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उत्तर
Helium is much less denser than ordinary air which gives them buoyancy and thus float in air.
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संबंधित प्रश्न
Why is the floating ice less submerged in brine than in water?
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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 test tube loaded with lead shots weighs 25 gf and floats upto the mark X in water. When the test tube is made to float in brine solution, it needs 5 gf more of lead shots to float upto level X. Find the relative density of brine solution.
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.
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A block of wood of volume 25 cm3 floats in water with 20 cm3 of its volume immersed in water.
Calculate:
(1) density of wood
(2) the weight of block of wood.
State the principle of floatation. What can you say about the average density of a ship floating on water?
Describe the purpose, principle, and working of the Lactometer.
