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Form 1 Physics Exam Questions and Answers on Pressure

A block of density 8900kg/m^3 measures 2cm by 5cm by 7cm is placed horizontally on a flat surface. Determine the difference between the maximum and minimum pressure.

(4m 2s)
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Volume = 2x5x7 =70cm^3
Mass=8.9g/cm^3times70cm^3 =623g
Weight = 623/1000times10= 6.23N
Area (minimum)=2times5=10cm^2
Area (maximum)=5times7=35cm^2
P(max)= 6.23/10 = 0.623N/cm^2 = 6230N/m^2
P(min)=6.23/35= 0.178N/cm^2 =1780N/m^2
P(difference) = 4450 N/m^2