A beam with L=6m is subject to two concentrated loads,
P_{1}=8000 N and P_{2}=4000 N.
- Determine the support forces R_{1} and R_{2}.
- Sketch the diagrams for the internal internal shear force V(x) and
the internal moment M(x) and calculate the values of V(x) and M(x)
at x/L = 0 , 1/3 , 1/2 , 2/3 , 1
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