The beam is supported by a pin at \(A\), a roller at \(B\), and a post having a diameter of \(50 \mathrm{~mm}\) at \(C\). Determine the support reactions at \(A, B\), and \(C\). The post and the beam are made of the same material having a modulus of elasticity \(E=200 \mathrm{GPa}\), and the beam has a moment of inertia \(I=255\left(10^{6}\right) \mathrm{mm}^{4}\).

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6 m 1 m 15 kN/m 6m- B