Question on: JAMB Physics - 2018
An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is
A
25.2N
B
17.4N
C
12.6N
D
9.0N
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Correct Option: B
Weight of water displaced = upthrust = 30 - 21 = 9N
 Mass of water displaced = \(\frac{9}{10}\) = 0.9kg
 Volume of object = 9 × 10\(^{-4}\)m\(^3\)
 = (9 × 10\(^{-4}\)) (1.4 ×103)
 = 1.26kg = 12N
 30 - 12.6 = 17.4N
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