Advertisements
Advertisements
प्रश्न
A piece of wax floats on brine. What fraction of its volume is immersed?
Density of wax = 0.95 g cm-3, Density of brine = 1.1 g cm-3.
Advertisements
उत्तर
Density of wax (`ρ_"w"`) = `0.95 "gcm"^-3`
Density of brine (`ρ_"B"`) = `1.1 "gcm"^-3`
Let the total volume of piece of wax be V and the volume of immersed portion be v .
According to the law of floatation ,
`"v"/"V" = ρ_"w"/ρ_"B"`
or , `"v"/"V" = 0.95/1.1 = 0.86`
or , v = 0.86 V
Thus , wax floats with 0.86th part of its volume above the surface brine .
APPEARS IN
संबंधित प्रश्न
Define the term density.
Complete the following sentence.
Density of water is .... ... kg m-3.
The density of water is :
A piece of iron weighs 44.5 gf in air. If the density of iron is 8.9 × 103, find the weight of iron piece when immersed in water.
A piece of wood of uniform cross section and height 15 cm floats vertically with its height 10 cm in water and 12 cm in spirit. Find the densities of wood and spirit.
An inflated balloon is placed inside a big glass jar which is connected to an evacuating pump. What will you observe when the evacuating pump starts working? Give a reason for your answer.
A body weighs 300 gf in air and 280 gf when completely immersed in water. Calculate:
(i) The loss in weight of the body,
(ii) The upthrust on the body.
Write the SI units of Density
Write the SI units of Relative density
