Is the beam horizontal and hinged at the wall? Is the cable attached to the other end of the beam? These things must be known to solve the problem.
If the above assumptions are correct, set the torque about the hinge equal to zero, assume the beam' weight of 2.0N acts at the center (40.5 cm from the hinge) and solve for the mass.
A mass is hung from a beam of weight 2.0 N and length 81 cm.
The tension and angle of the cable supporting the beam is 5.0 N at an angle of 40° from the horizontal.
Using torques produced calculate the value of the unknown mass.
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