Question -
Answer -
The maximum mass of a car that can be lifted, m =3000 kg
Area of cross-section of the load-carrying piston, A =425 cm2 = 425 × 10–4 m2
The maximum force exerted by the load, F = mg
= 3000 × 9.8
= 29400 N
The maximum pressure exerted on the load-carrying piston, 
= 6.917 × 105 Pa
Pressure is transmitted equally in all directions in a liquid.Therefore, the maximum pressure that the smaller piston would have to bear is6.917 × 105 Pa.