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31) What is the intensity of pressure below a point load where r is equal to zero on the axis of loading?

a) σ_z= (0.4775Q )/(z^2 )

b) σ_z= (0.7Q )/(z^2 )

c) σ_z= (0.4775Q )/( z^3 )

d) σ_z= (0.8Q )/z

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