Advertisements
Advertisements
प्रश्न
Explain the following :
A balloon filled with hydrogen rises to a certain height and then stops rising further.
Advertisements
उत्तर १
The reason is that the density of air decreases with altitude. Therefore, as the balloon gradually goes up, the weight of the displaced air (i.e. uphrust) decreases. It keeps on rising as long as the upthrust exceeds its weight. When upthrust becomes equal to its weight, it stops rising.
उत्तर २
A balloon filled with hydrogen has low density than air so it rises over the air but as height increases density of air decreases and at a certain height the density of hydrogen in balloon and density of air become equal. And as there is no density difference there is no pressure difference also and hence balloon stops rising further.
संबंधित प्रश्न
Complete the following sentence.
Density of water is .... ... kg m-3.
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.
When a piece of ice floating in water melts, the level of water inside the glass remains same. Explain.
Select the correct option:
When a body is floating in a liquid:
Select the correct option:
A body has density 9.6 gcm -3. Its density in SI system is:
An iron nail sinks in the water while an iron ship floats on water. Explain the reason.
What can you say about the average density of a ship floating on water?
If 2/3rds of a piece of wood submerges in water and 3/4ths of the same piece of wood submerges in oil. Find the density of the oil.
A wooden cube of side 10 cm has a mass of 700 g. It will float in the water with:
(a) Half of its volume inside the water
(b) 3 cm height above the water surface
(c) 7 cm height above the water surface
(d) Just inside the water surface.
Complete the following result:
Mass = _______ × density
