We know that,
Pressure (P) = {Force(F) \over Area(A)}
F = P x A
F ∝ A (pressure = constant)
As water evaporates from the pond, so area will be smaller. Hence, force will also be smaller.
The finger exerts a force of 84 N on the pinhead. The pinhead has an area of 6.0 × 10-5 m2 . Explain why the pin causes more pain in the man’s thumb than in his finger.
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