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प्रश्न
It is easier to lift a heavy stone under water than in air. Explain.
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उत्तर १
It is easier to lift a heavy stone under water than in air because in water, it experiences an upward buoyant force which balances the actual weight of the stone acting downwards. Thus, due to upthrust there is an apparent loss in the weight of the heavy stone, which makes it lighter in water, and hence easy to lift.
उत्तर २
It is easier to lift a heavy stone under water because in water an upthrust acts on the upward direction which reduces the apparent weight of the stone and makes it easy to lift.
संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
What is upthrust ?
What is the scientific name of the 'upward force' acting on an object immersed in a liquid?
Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?
When a boat is partially immersed in water, it displaces 600 kg of water. How much is the buoyant force acting on the boat in newtons ? (g = 10 m s-2)
How does the liquid pressure on a diver change if:
the diver moves to the greater depth
Complete the following sentence :
Pressure is .................... in all directions about a point in a liquid.
The S.I. unit of pressure is :
- 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?
Consider the statement given below and choose the correct option.
Assertion: Water strider slides easily on the surface of the water.
Reason: Water strider experiences less buoyant force.
