Rotional dynamics

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Nb
HELP I HAVE NO CLUE HOW TO DO THIS QUESTION


A person is sitting with one leg outstretched so that it makes an angle of 30.0° with the horizontal, as the drawing indicates. The weight of the leg below the knee is 44.5 N with the center of gravity located below the knee joint. The leg is being held in this position because of the force M applied by the quadriceps muscle, which is attached 0.100 m below the knee joint (see the drawing). Obtain the magnitude of M

(CLICK LINK BELOW TO SEE DIAGRAM)
http://edugen.wiley.com/edugen/courses/crs1000/art/images/c09/nw0356-n.gif [
 

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