1.Point loads of magnitude 2000, 4000, and 6000 lb act at A, B, and C, respectively. (Figure 10.36). Determine the increase in vertical stress at a depth of 10 ft below point D. Use Boussinesq's equation.
2.A gunite concrete trapezoidal channel (n = 0.019) with 1:2 side slopes, as ilustrated below, conveys 60 m3/s on a slope of 0.0005. Compute the depth of flow.
3.A rod of copper alloy 50 inches long has a modulus of elasticity of 16*10^7 psi. If the maximum allowable elongation is 0.05 in, determine the diameter of the rod if it has to be subjected to a load of 3200 lb.