1.

In a car lift compressed air exerts a force f1 on a small piston having a radius of 5 cm.this pressure is transmitted to a second piston of radius 10 cm.if the mass of the car to be lifted is 1350 kg what is f1?what is the pressure necessary to accomplish this task?take g=9.8ms^-2

Answer»

According to Pascal's law, Pressure is transmitted equally and undiminished through out the fluid.P1=P2F1/A1=F2/A2F1= (A1/A2 ) F2=[π(5 x10⁻²m)²/π(15x10⁻²m)² ](1350Nx9.8m/s2)=1470N=1.5 x 10³ NThe air pressure that will produce this forceP=F1/A1=1.5x10³N/π(5x10⁻²)² m=1.9 x 10⁵ PaThis is almost the double of atmospheric pressure.



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