Q. 35.0( 1 Vote )
A solid is completely immersed in a liquid. The force exerted by the liquid on the solid will
A. increase if it is pushed deeper inside the liquid
B. change if its orientation is changed
C. decrease if it is taken partially out of the liquid
D. be in the vertically upward direction.
Answer :
The force exerted by the liquid is equal to the weight of the water displaced which in turn is equal to the weight of the solid. This force will not change if we push the object deeper as it has already displaced water equal to its volume (completely immersed). Thus option (A) is wrong. From the same line of reasoning, as the volume displaced is already fixed due to a complete immersion, changing its orientation will not create any new forces. Therefore, option (B) is wrong.
If the object is partially take out, then we are decreasing the weight of the liquid displaced, thus the force will change. So, option (C) is correct. The force on the solid by the liquid (buoyant force) is perpendicular to the surface of the solid and in the vertically upward direction (balancing the weight). Thus option (D) is correct.
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