Answer to Question #144057 in Physics for Laiza

Question

A flat bar is loaded with boxes as shown in figure at right. Box M=50 kg, what must be the magnitude of mass m so that the bar becomes level? Neglect the weight of the bar. What torque each end of the bar.

Answer 1

Equilibrium of torques:

$$Md=m(l-d),\\\space\\ m=M\frac{d}{l-d}.$$

The torques are

$$\tau_M=Md,\\ \tau_m=m(l-d)=Md.$$