in the diagram ,a body, ABCD is placed in water. study the diagram and answer following question.
(i) on what surface of the body, will pressure be the maximum and why? (ii) on what level, will thrust be the maximum? explain why?
Answers
Answer:
Liquid exerts pressure at all points and in all directions when contained in a vessel, this pressure on a
liquid is the same in all directions and increases with depth inside the liquid.
Upthrust is caused because of a difference in the pressures due to liquid on the two faces of a body
(upper and lower) causing a net upward force known as upthrust. The thrust acting on the sides of
the walls of the body get neutralized as they are equal in magnitude and opposite in directions.
The upthrust is considered to act at the center of buoyancy i.e., the center of gravity of the displaced
fluid.
Explanation:
In the diagram water exerts more pressure on the surface ‘CD’ of an object. Because the depth of the CD is more than that of AB. As we know liquid pressure is directly proportional to the depth of the liquid.
(a) The buoyant force is the same in each case as the weight of the body is the same in each case and buoyant force is equal to the weight of liquid displaced by the immersed part of the body which balances the weight of the body.
(b) The liquid A has the least density as the body immerses the maximum.
(c) Liquid C has the highest density as the body immerses the least.
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