Advertisements
Advertisements
प्रश्न
Define buoyant force. Name two factors on which buoyant force depends.
Advertisements
उत्तर
The upward force exerted by a liquid on a body when immersed in a liquid is known as buoyant force. The buoyant force depends on the following factors:
(i) Size or volume of the body immersed in a liquid.
(ii) The density of the liquid in which the body is immersed.
APPEARS IN
संबंधित प्रश्न
The S.I. unit of density is ..........
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
What is a density bottle? How is it used to find the density of a liquid?
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
(a) body A having density of 500 kg m-3
Explain the following statement:
Sleepers are laid below the rails.
(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).
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
Define upthrust and state its S.I. unit.
A body is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the body in equilibrium, and state the direction in which each force acts.
Select the correct option:
When an object sinks in a liquid, its:
