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: 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