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प्रश्न
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?
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उत्तर
Density of water = 1.0 g/cm3
Density of iron = 7.8 × 103 g/cm3 = 7800 g/cm3 (which is much greater than 1.0 g/cm3)
Since iron is much denser than water, A piece of iron will sink in water.
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संबंधित प्रश्न
Distinguish between density and relative density.
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.
Complete the following sentence :
A piece of wood is held under water. The upthrust on it will be ___________ the weight of the wood piece.
A body will experience minimum upthrust when it is completely immersed in :
The S.I. unit of upthrust is :
A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of centre of buoyancy B with respect to the centre of gravity G of the block.
Most buoyant objects are those with relatively ______.
- high volume
- higher mass
- low density
- less viscosity
If the buoyant force is less, the object will float.
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
