Two cylindrical vessels fitted with pistons A and B of area of cross section 8 cm2 and 320 cm2 respectively, are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, find : (i) the pressure on piston A, (ii) the pressure on piston B, and (iii) the thrust on piston B.
(i) Pressure on piston A = Weight on piston A / Area of piston A
=4×10 N8 cm2=5 N/cm2
(ii) As per Pascal's law, pressure on piston B = Pressure on piston A = 5 N/cm2
(iii) Suing Pascal's law, FAAA=FBAB⇒4×108=FB320⇒FB=1600 N