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22. A block of wood is kept on a tabletop. The mass of wooden block is 5kg and its dimensions are 40cmx20cm x 15cm. Find the pressure exerted by the wooden block on the table top if it is made to lie on thetabletop with its sides of dimension.

Answer»

Mass of the wooden block = m= 5 kgdimensions = 40 cm × 20 cm × 15cmthe weight of the wooden block applies a thrust on the table top.That is,Thrust = F = mg= 5 kg × 9.8 m/s²= 49 N

Area of a side = length × breadth= 20 cm × 15 cm= 300 cm²= 0.03 m²

Pressure = thrust/ areaPressure = 49 /0.03= 1633.3N/m²

The same thrust in implied when it lies on the given dimension.Area= length × breadth= 40 × 20= 800= 0.08 m²

Pressure = 49/0.08= 612.5



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