Advertisements
Advertisements
प्रश्न
What is meant by the term ‘buoyancy’ ?
Advertisements
उत्तर
Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object.
APPEARS IN
संबंधित प्रश्न
A body experiences the same buoyant force while floating in water or alcohol.
Why is the tip of an allpin made sharp?
Pressure at the free surface of a water lake is P1, while at a point at depth h below its free surface is P2. (a) How are P1 and P2 related? (b)Which is more P1 or P2?
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.
- 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?
Why is a force needed to keep a block of wood inside water?
How is the upthrust related to the volume of the body submerged in a liquid?
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 blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.
[Take density of mercury as 13.6 × 103 kgm−3 and the value of ‘g’ as 10 ms−2]
Complete the analogy.
Downward force : Weight :: Upward force offered by liquid : ______
