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प्रश्न
Why is a force needed to keep a block of wood inside water?
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उत्तर
A force is required to hold a block of wood in water because the upthrust caused by water on the block when fully submerged surpasses its weight.
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संबंधित प्रश्न
The diagram given below show a body floating in three different liquids. A, B and C at different levels.
(a) In which liquid does the body experience the greatest buoyant force?
(b) Which liquid has the least density?
(c) Which liquid has the highest density?
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
For a given object, the buoyant force in liquids of different ______ is ______.
Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just Below the free surface of water. State and explain your observation.
What do you understand by the term upthrust of a fluid? Describe an experiment to show its existence.
Define upthrust and state its S.I. unit.
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.
The magnitude of buoyant force acting on an object immersed in a liquid depends on ______ of the liquid.
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.
