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प्रश्न
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
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उत्तर
It is easier to cut with a sharp knife because even a small thrust causes great pressure at the edges and cutting can be done with less effort.
संबंधित प्रश्न
State whether the following statement is true or false :
The buoyant force depends on the nature of object immersed in the liquid
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 ?
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body D having density 0.85 g m-3
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
A plastic cube is released into the water. Will it sink or come to the surface of the water?
Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.
(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).
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 center of gravity of the floating body and the center of buoyance are in the same ______ line.
In a fluid, buoyant force exists because the pressure at the ______ of an object is greater than the pressure at the top.
