49 Nm A. 72.12 Nm B. -36.67 Nm C. 36.67 Nm This question was

49-nm-a-72-12-nm-b-36-67-nm-c-36-67-nm-this-question-was

49 Nm

A. 72.12 Nm

B. -36.67 Nm

C. 36.67 Nm

This question was addressed to me in an online quiz.

My doubt stems from Bending Moment Diagram topic in chapter Internal Forces of Engineering Mechanics

Right option is A. 72.12 Nm

Easy explanation: The use of the formula A.(rxF) gives the answer. In which A is 0.89i + 0.447j m. And the force is 300N, which is being applied at the end of the rod. Thus, after finding the equation of the axis and then replacing it in the equation shown above we get the answer. Actually, the main task is to know the axis equation in the vector form. Then get the magnitude of the moment.