A cylindrical jar of cross sectional area of 50cm^2 is filled with water to a height of 20cm. it carries a tight-fitting piston of negligible mass. the
pressure at the bottom of the jar when a mass of 1kg is placed on the piston (ignore atmospheric pressure, given:g=9.8)




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Force on the bottom of the jar = weight of water column + weight of given mass
     = (50 cm² * 20 cm * 1 gram/cm³  + 1 kg) * g
     = 2 kg * 9.8 m/sec²
     = 19.6 Newtons

Pressure exerted on the bottom surface of the jar
       = force/ surface area = 19.6 N/ 50 cm²
     = 19.6 N / 0.0050 m²
     = 3920 Pa

In reality, the actual pressure will be the atmospheric pressure + the above calculated  pressure.

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