Advertisements
Advertisements
प्रश्न
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
उत्तर
We feel light on our feet when standing in a swimming pool with water up to our armpits because of the buoyant force. It exerts an upward force on our body and makes us feel our apparent weight which is less than our actual weight.
APPEARS IN
संबंधित प्रश्न
A body sinks in a liquid A but floats in a liquid B. The density of liquid A is ....... than the density of liquid B.
The relative density of alcohol is 0.8. Its density is
The density of aluminium is 2.7 g cm-3 and that of brass 8.4 g cm’3. The correct statement is
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
How does the pressure exerted by thrust depend on the area of surface on which it acts? Explain with a suitable example.
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
(i) The diameter of neck and bottom of a bottle are 2 cm and 10 cm, respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle?
(ii) Name the law/principle you have used to find the force in part (a).
A body will experience minimum upthrust when it is completely immersed in :
The mass of a block made of certain material is 13.5 kg and its volume is 15 × 10-3 m3.
(a) Calculate upthrust on the block if it is held fully immersed in water.
(b) Will the block float or sink in water when released? Give a reason for your answer.
(c) What will be the upthrust on block while floating?
Take density of water = 1000 kg m-3.
What is meant by up thrust?
