1.

Two forces F, and F2 of 12 N and 9 N respectively act ata point. Their resultant is 15 N. Determine the inclinationbetween F, and F2 and also between R and F,

Answer»

R^2=F1^2+F2^2+2F1F2costhetacostheta=15^2-12^2-9^2/2*12*9=225-144-81/216=0/216=0hence theta=90°



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