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प्रश्न
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.
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उत्तर
Ice floats in water and not in alcohol. This is because the density of ice is `"0.917g"/"cc"` which is lower than that of water which is 1. Whereas, the density of ethanol (alcohol) is only `"0.789g"/"cc " `which is lesser than ice, hence it floats in alcohol.
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संबंधित प्रश्न
A body is held immersed in a liquid. (i) Name the two forces acting on the body and draw a diagram to show these forces. (ii) State how the magnitudes of two forces mentioned in part (i) determine whether the body will float or sink in liquid when it is released. (iii) What is the net force on the body if it (a) sinks and (b) floats?
Draw a diagram to show the forces acting on a body floating in water with its some part submerged. Name the forces and show their points of application. How is the weight of water displaced by the floating body related to the weight of the body itself?
A body of volume V and density ρs , floats with volume v inside a liquid of density ρL. Show that `"v"/V = ρ_s/ρ_L` .
Explain the following :
Icebergs floating in sea are dangerous for ships.
A hollow metal cylinder of length 10 cm floats in alcohol of density 0.80 g cm-3, with 1 cm of its length above it. What length of cylinder will be above copper sulphate solution of density 1.25 g cm-3?
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.
State the laws of flotation.
Assertion: To float, body must displace liquid whose weight is equal to the actual weight.
Reason: The body will experience no net downward force in that case.
Where do we use lactometers?
