A beam of rectangular cross section is simply supported at the ends and subject to the single concentrated force shown below. Determine the shearing stress at a point 3 cm below the top of the beam at a section 1 m to the right of the left reaction. Also, determine the maximum shearing stress due to the vertical shear V. 2 m 27 kN 1 m 12 cm --46 cm- 9 kN 18 kN