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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?
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उत्तर
a) Buoyant force is same in each case as the wt. of the body is same in each case and Buoyant force is equal to the weight of the liquid displaced by the immersed part of the body which balances the wt. of body.
(b) The liquid A has the least density as body immerses the maximum.
(c) Liquid C has the highest density as the body immerses the least.
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संबंधित प्रश्न
Relative density of a substance is expressed in g cm-3.
Distinguish between density and relative density.
For a floating body, how is its weight related to the buoyant force?
The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.
- Name the parts labelled by the letters X and Y.
- Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
- Give reasons for what happens to valves A and B in part (ii).
- What happens when the release valve is opened?
- What happens to valve B in cylinder P when the lever arm is moved up?
- Give a reason for your answer in part (v).
- State one use of the above device.
Complete the following sentence :
Pressure is .................... in all directions about a point in a liquid.
In what direction and at what point does the buoyant force on a body due to a liquid act?
A small block of wood is completely immersed in (i) water, (ii) glycerine and then released. In each case, What do you observe? Explain the difference in your observation in the two cases.
A body weighs 450 gf in air and 310 gf when completely immersed in water. Find
(i) The volume of the body,
(ii) The loss in weight of the body, and
(iii) The upthrust on the body.
State the assumption made in part (i).
A body will sink if the weight of the body is greater than the buoyant force.
The center of gravity of the floating body and the center of buoyance are in the same ______ line.
