Ex/1 (a) Calculate the moment of the 90-N force about point O for the condition 6 15°. Also, determine the value of 0 for which the moment about O is (b) zero and (c) a maximum. (a) e - 15° M.= 10 cos 15 (a.6)-10sin 15 (a.2) 90 N = 33.5 N m 800 F- 90 N 800 mm mm

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