Topic: Strength of Materials
In a simply supported beam loaded as shown in figure, the maximum bending moment in Nm is
- A. 25
- B. 30
- C. 35
- D. 60
Answer: B. 30
Explanation: Balancing vertical forces: Ra + Rb = 100 N. Taking moments about point A to find Rb: Rb * 1 = 100 * 0.1 + 100 * 0.5. Solving gives Rb = 60 N and thus Ra = 40 N. The moment at the center point C coming from the left reaction is Ra * 0.5 = 40 * 0.5 = 20 Nm. The offset load also creates a concentrated moment of 100 N * 0.1 m = 10 Nm acting in the same direction. The maximum bending moment at C is 20 + 10 = 30 Nm.