Advertisements
Advertisements
Question
A dam has broader walls at the bottom than at the top. Explain.
Solution 1
The pressure exerted by a liquid increases with its depth. Thus as depth increases, more and more pressure is exerted by water on wall of the dam. A thicker wall is required to withstand greater pressure, therefore, the thickness of the wall of dam increases towards the bottom.
Solution 2
RELATED QUESTIONS
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 body X sinks in water, but a body Y floats on water. The density of the body X is ......... than the density of body Y.
What is a density bottle? How is it used to find the density of a liquid?
A plastic cube is released into the water. Will it sink or come to the surface of the water?
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
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.
A body experiences an upthrust F1 in river water and F2 in sea water when dipped up to the same level. Which is more, F1 or F2? Give reason.
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.
Select the correct option.
The unit Nm2 is the unit of
The magnitude of buoyant force acting on an object immersed in a liquid depends on ______ of the liquid.
