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प्रश्न
State the laws of liquid pressure.
उत्तर
Laws of liquid pressure:
(i) Pressure at a point inside the liquid increases with the depth from its free surface.
(ii) In a stationary liquid, pressure is same at all points on a horizontal plane.
(iii) Pressure is same in all directions about a point in the liquid.
(iv) Pressure at same depth is different in different liquids. It increases with the increase in the density of liquid.
(v) A liquid seeks its own level.
संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
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.
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
The pressure P1 at the top of a dam and P2 at a depth h form the top inside water (density p) are related as :
- 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?
In what direction and at what point does the buoyant force on a body due to a liquid act?
What is the cause of upthrust? At which point can it be considered to act?
A small block of wood is completely immersed in (i) water, (ii) glycerine and then released. In each case, What do you observe? Explain the difference in your observation in the two cases.
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.
The magnitude of buoyant force acting on an object immersed in a liquid depends on ______ of the liquid.
