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प्रश्न
State the principle of floatation.
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उत्तर
“When a solid is floating in a fluid, the weight of whole solid acting vertically downward at its "Centre of Gravity", is equal to the weight of the fluid displaced by the "Immersed" part of solid acting upward, at its "centre of Buoyancy" or at the centre of the "Bulk of liquid" displaced.”
OR
“The weight of a floating body is equal to the weight of the liquid displaced by its "Submerged" part.”
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संबंधित प्रश्न
An iron nail sinks in the water while an iron ship floats on water. Explain the reason.
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Give reasons.
Hint: Ice contracts on melting.
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A weather forecasting plastic balloon of volume 15 m3 contains hydrogen of density 0.09 kg m-3. The volume of equipment carried by the balloon is negligible compared to its own volume. The mass of an empty balloon alone is 7.15 kg. The balloon is floating in air of density of 1.3 kg m-3. Calculate:
(i) The mass of hydrogen in the balloon,
(ii) The mass of hydrogen and balloon,
(iii) The total mass of hydrogen, balloon and equipment if the mass of equipment is x kg,
(iv) The mass of air displaced by balloon and
(v) The mass of equipment using the law of floatation.
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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.
Name different types of Hydrometers with their applications.
Differentiate positive & negative buoyant.
