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CBSE Class 9 Answered

an object floats in water such that 1/5 of its volume is above the surface of water. When the same object is made to float in sample of impure alchohol, the volume that remains outside the liquid is 1/20 of total volume. What will the relative density of the sample of alcohol?
Asked by kaustav1996 | 22 Oct, 2010, 07:04: PM
answered-by-expert Expert Answer
Dear student
 
Let σ be the density of water and ρ be the density of alcohol.
Let V be the fractional volume above the surface of water and V' be the fractional volume above the sample of impure alcohol
since objects floats on water, therefore the weight of alcohol displaced is equal to the weight of water displaced, then :
 
V' / V  =  σ / ρ
 
Now, plugging in the values and calculating, you may find the value of density of impure alcohol, folowing which relative density can also be found.
 
We hope this clarifies your doubt.
 
Regards
Team
Topperlearning
 
The electricity enters the AC were it is transformed into magnetic fields inside two motors (the motor that powers the fan and the motor that powers the compressor).
4) The magnetic field energy is transformed into motion by moving magnets inside the motors.
5) The motion of the magnets in the fan turns the fan blades which move air.
6) The motion in the compressor is transformed into pressure by compressing a CFC gas until it becomes liquid. The pressure energy and latent energy in the gas turn into heat energy as the gas becomes liquid (it gets hot).
7) The heat energy in the liquid CFC is transferred to the outside air in a radiator.
8) The CFC is allowed to evaporate inside the inside radiator (heat is transferred from the air to the CFC). The air's heat is used to boil the CFC.
9) The gaseous CFC goes to the compressor where the process repeats itself.
Answered by | 25 Oct, 2010, 12:58: PM

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