A cube of sides 0.1m hangs freely from a string. What is the upthrust on...

JAMB 1997

A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2]

A. 1000 N
B. 700 N
C. 110 N
D. 10 N

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Correct Answer: Option D

Explanation

Volume of water displaced = volume of cube

therefore, 0.1 x 0.1 x 0.1 = 0.001m³

mass of H₂O = 0.001 X 1000

= 1kg

upthrust = mg

= 1 x 10

=10N

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A cube of sides 0.1m hangs freely from a string. What is the upthrust on...

Correct Answer: Option D

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