Which one of the following everyday devices operates principally on Pascal’s law?

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Problem

Which one of the following everyday devices operates principally on Pascal’s law? (a)

\text{Single fixed pulley used to draw water from a well}

(b)

\text{Hydraulic disc brake in a car}

(c)

\text{Bicycle pump for inflating tyres}

(d)

\text{Mercury barometer for measuring atmospheric pressure}