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

Assessment: JAMB UTME - Physics - 2018 Subject: Physics

Question 1 Report

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
Answer Details

Weight of water displaced = upthrust = 30 - 21 = 9N
Mass of water displaced =  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

Read lesson note on Gravitational Field (JAMB)
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