Question

The diameter of the piston of a hydraulic automobile is D metre. What pressure, in atmosphere is required to lift a car of mass m kg ?
A. `(4mg)/(pi D^2 xx 10^5)`
B. `(2mg)/(pi D^2)`
C. `(mg)/(pi D^2)`
D. `10^5 xx (4mg)/(pi D^2)`

Answer 1

Correct Answer - A
(a) `P xx (pi D^2)/(4) =mg or P = (4mg)/(pi D^2) pascal` or `P = (4mg)/(pi D^2 xx 10^5) atmosphere`