Question

A block of wood has a mass of 20 kg. Its length, breadth and height are 30 cm, 25 cm and 10 cm respectively. On which of its sides should it rest so that it exerts the least pressure on the ground? Also, calculate this pressure. (Take g = 10 m/s²)

Answer 1

$$\begin{gathered} Pressure=\frac{force}{area} \\ pressurewillbeleastwhenareaismaximum. \\ Areaismaximumwhenblckiskeptalongthelengthandthebreath. \\ area=30\times 25\times {10}^{-4} \\ area=750\times {10}^{-4}{m}^2 \\ area=0.075m^2 \\ force=weight=mg=20\times 10=200N \\ Pressure=\frac{200}{0.075} \\ pressure=2666.6pascal \end{gathered}$$