A block of material of volume 2 X 10−5m3 and ...
A block of material of volume 2 X 10−5m3 and density 2.5 x 103 kgm−3 is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x103 kg m−3 g = 10 ms−2).
0.10N
0.25N
0.30N
0.40N
0.50N
Correct answer is D
Weight of object = mg
= ρvg = 2.5 x 103 x 2 x 10−5 x 10 = 0.5N;
Upthrust = weight of displaced fluid = ρwatervg
= 1.0×103×2×10−5×102 = 0.1N
∴Reading = 0.5 – 0.1 = 0.4N