A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?
A. 0.68 kN
B. 0.57 kN
C. 0.74 kN
D. 0.63 kN
E. 0.35 kN
Answer: A
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