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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. |
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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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