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प्रश्न
Why is the tip of an allpin made sharp?
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उत्तर
The tip of an allpin is made sharp so that large pressure is exerted at the sharp end and it can be driven into with less effort.
संबंधित प्रश्न
What causes buoyant force (or upthrust) on a boat ?
An object of weight 200 N is floating in a liquid. What is the magnitude of buoyant force acting on it ?
Why does a block of wood held under water rise to the surface when released ?
Define buoyant force. Name two factors on which buoyant force depends.
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
The density of water is 1.0 g Cm-3. The density of iron is 7.8 × 10″3 g Cm-3. The density of mercury is 13.6 g Cm-3.
Ans the following:
Will a piece of iron float or sink in water?
Why does it happen?
A ship dips to a larger depth in fresh water as compared to marine water.
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
You are provided with a hollow iron ball A of volume 15 cm3 and mass 12 g and a solid iron ball B of mass 12 g. Both are placed on the surface of water contained in a large tub.
- Find upthrust on each ball.
- Which ball will sink? Give a reason for your answer (Density of iron = 8.0 g cm-3)
Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm−3 and g = 9.8 ms−2.
