Advertisements
Advertisements
प्रश्न
Why does a block of wood held under water rise to the surface when released ?
उत्तर
A wooden block held under water floats on the surface on release because it is less dense than water. A substance floats if it is less dense than the fluid in which it is immersed after the external force is withdrawn from it.
APPEARS IN
संबंधित प्रश्न
A body experiences the same buoyant force while floating in water or alcohol.
What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?
If a fresh egg is put into a beaker filled with water, it sinks. On dissolving a lot of salt in the water, the egg begins to rise and then floats. Why ?
Name the S.I. unit of density. How is it related to g Cm-3?
What is a density bottle? How is it used to find the density of a liquid?
How does the liquid pressure on a diver change if:
the diver moves to the greater depth
The area of base of a cylindrical vessel is 300 cm2. Water (density= 1000 kg m-3) is poured into it up to a depth of 6 cm. Calculate : (a) the pressure and (b) the thrust of water on the base. (g = 10m s-2.
- Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g cm-3.
- Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
Select the correct option.
Unit of thrust in the SI system is
Select the correct option.
Thrust acting perpendicularly on the unit surface area is called
