A cube of sides 0.1m hangs freely from a string. What is the upthrust on...
PHYSICS
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
Correct Answer: D. 10 N
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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