Question 8
Equilibrium of ForcesThe diagram above shows a uniform wood of weight 200 N and length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30° to the wood. Calculate the tension in the cord if the wood is horizontal.
- A.10 N
- B.20 N
- C.100 N
- D.200 N
Show the answer and explanation
Answer: D (200 N)
Explanation
Moments about the pivot: 200 × 25 = T sin 30° × 50, so 5000 = 25T and T = 200 N.