Q11 of 46 Page 247

A 10 Kg mass is suspended from a beam 1.2 m long. The beam is fixed to a wall. Find the magnitude and direction (clockwise or anti-clockwise) of the resulting moment at point B.

Moment is given by r × F.

Here F = mg


where g is the acceleration due to gravity,


m is mass.


So moment = 1.2 × mg


= 1.2 × 10 × 9.8


= 117.6 Nm in the clockwise direction.


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