12. A cylindrical jar of cross-sectional area 0.01 m 2 is filled with water to a height of 50 cm. It carries a tight-fitting piston of negligible mass. What is the pressure at the bottom of the jar when a mass of 1 kg is placed on the piston ? Take g = 10 ms-2 .
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cylindrical cross sectional area 0.01m2 is filled with wter to a ... of the jar when a mass of 1kg is placed on the piston?
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