Topic: Engineering Mechanics
The bar AB weighs 10 kg per meter and is supported by cable AC and a pin at B. Reaction at B is (take g = 10 m/s²)
- A. 200 N, vertical
- B. 200 N, at 30° to horizontal
- C. 100 N vertical
- D. 100 N at 60° to horizontal
Answer: B. 200 N, at 30° to horizontal
Explanation: The total weight of the rod is 10 kg/m * 2m * 10 m/s² = 200 N acting at the center. Taking moments about B, Tsin(30) * 2 - 200 * 1 = 0, so T = 200 N. Summing forces, R_BV = 100 N and R_BH = 173.2 N. The resultant reaction is 200 N at 30° to the horizontal.