First slide

Fluid statics

Question

A stone tied to a string is supported from a spring scale that reads 10 N. A pan of water rests on the platform of a weighing machine and it reads 80 N. The stone is lowered into the water and the spring scale ten reads 5 N. It follows that the weighing machine

Moderate

A

still reads 80 N
B

now reads 70 N
C

now reads 90 N
D

now reads 85 N

Solution

Buoyant force for $u = 10 N - 5 N = 5 N$
$∴$ New reading of the weighing machine $= 80 N + 5 N = 85 N$

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