Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
When tube floats in water:
Weight of test tube = 150 gf
By law of floatation:
Weight of water displaced = Weight of test tube = 150 gf
When test tube floats in alcohol :
When test tube is made to float in alcohol, then 27 gf of lead shots have to removed, so that it can float upto the same level as in water.
∴ Weight of test tube in alcohol = 150 – 27 = 123 gf
By law of floatation:
Weight of alcohol displaced by test tube =
Weight of test tube in alcohol = 123 gf
As volume of alcohol displaced = Volume of water displaced
∴ R.D. of alcohol
`= "Weight of alcohol displaced"/"Weight of equal volume of water displaced"`
`= 123/150 = 0.82`
APPEARS IN
संबंधित प्रश्न
Explain the following :
Icebergs floating in sea are dangerous for ships.
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.
Explain the following:
A hydrometer is made heavy near the bottom.
Explain the following:
Icebergs floating in the sea are very dangerous for ships.
Why does a helium balloon float in air?
Hydrometer is based on the principle of ______.
How do submarines sink and float in water?
Differentiate positive & negative buoyant.
Assertion (A): Lactometer is used to check the purity of milk.
Reason (R): Lactometer measures the cream content of milk.
