Question on: WAEC Physics - 1993
A block of material of volume 2 X 1O-5m3 and density 2.5 x 10-3 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).
A
0.10N
B
0.25N
C
0.30N
D
0.40N
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Correct Option: D
Weight of object = mg = pvg = 2.5 x 103 x 2 x 10-5 x 10 = 0.5N; Upthrust = weight of displaced fluid = pvg water
= 1.0 x 103 x
2 x 10-5/2 x 10 = 0.1N
∴Reading = 0.5 – 0.1 = 0.4N
∴Reading = 0.5 – 0.1 = 0.4N
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