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22 May, 08:36

A body of volume 100cc immersed completely in water contained in a jar. The weight of water and jar before immersion of the body was 700gm. After immersion, what will be the weight of water and jar?

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  1. 22 May, 11:55
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    800gm

    Explanation:

    Archimedes principle states that when an object is immersed in a liquid there is an apparent loss of weight of the object. This apparent loss of weight is also the upthrust experienced by the liquid. The upthrust is equal to the weight of the liquid displaced.

    Following from the above statement, when the body of volume 100c. c is immersed in the water contained in the jar, the upthrust experienced is equal to the weight of the water displaced.

    Note: In the question, weight is measured just using the mass.

    Mass (m) is the product of density (ρ) of liquid (which is water in this case) and volume (v) of body immersed. i. e

    m = ρ x v

    Where;

    ρ = 1 gm/cm³

    v = 100c. c = 100cm³

    => m = 1 gm/cm³ x 100cm³

    => m = 100gm

    Therefore the weight of water displaced is 100gm

    Now, the weight of the water and jar after immersion is the sum of the weight of water and jar before immersion, and the weight of the water displaced. i. e

    Weight of water and jar after immersion = 700gm + 100gm = 800gm
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