Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density (10^{3}) kgm-3 [g = 10ms-2]
-
A.
0.8N -
B.
2.5N -
C.
0.5N -
D.
1.0N
Correct Answer: Option C
Explanation
Upthrust = change in weight
density = (frac{text{mass}}{text{volume}})
Mass of liquid displaced = Density of Liquid × Volume;
= (10^{3} times 50 times 10^{−6}m^{3})
= 0.05kg
(Note that the volume of (50cm^{3}) was converted to (m^{3}) by multiplying by (10^{6})) i.e (50cm^{3} = 50 times 10^{−6}m^{3})
Since mass displaced = 0.05kg
Upthrust = mg = 0.05 × 10
= 0.5N
There is an explanation video available below.