Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density 103kgm-3 [g = 10ms-2]

Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density 103kgm-3 [g = 10ms-2]
A. 0.8N
B. 2.5N
C. 0.5N
D. 1.0N

Correct Option: Answer is C

Upthrust = change in weight
density = mass/volume

Mass of liquid displaced = Density of Liquid × Volume;
= 103×50×10−6m3
= 0.05kg
(Note that the volume of 50cm3 was converted to m3 by multiplying by 106) i.e 50cm3=50×10−6m3
Since mass displaced = 0.05kg
Upthrust = mg = 0.05 × 10
= 0.5N

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