(c) A force F = 2i +3j + 4k pushes an object of mass 5 kg from the origin to a position vector r = 3i - 2j +5k. Using the scalar product of vectors, determine
the work done by the force on the object.
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Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.