In the opposite figure : The sum of the moments of the two forces about D is ... N.m \( \begin{array}{ll}\text { a) } 30 & \text { b) } 50 \\ \text { c) } 60 & \text { d) } 40\end{array} \)

To solve the problem, we need to calculate the sum of the moments of the two forces about point D. However, I don't have the figure you mentioned, so I will outline the general steps to calculate the moments of forces about a point. 1. **Identify the Forces**: Determine the magnitudes and directions of the forces acting on the object. 2. **Determine the Distances**: Measure the perpendicular distances from point D to the line of action of each force. This distance is crucial for calculating the moment. 3. **Calculate the Moments**: The moment (or torque) caused by a force about a point is calculated using the formula: \[ M = F \cdot d \] where \( M \) is the moment, \( F \) is the force, and \( d \) is the perpendicular distance from the point to the line of action of the force. 4. **Consider the Direction**: Moments can be clockwise or counterclockwise. Assign a positive or negative sign based on the convention you choose (e.g., counterclockwise as positive). 5. **Sum the Moments**: Add the moments from both forces, taking into account their signs. If you can provide the specific values for the forces and distances, I can perform the calculations for you.