1.

two forces 80N and 70N act simultaneously at a point.Find the resultant force,if the angle between them is 150°

Answer»

f1 =80 N 

f2 = 70N 

F=√f12 +f22+f1. f2 cosΦ

F=√6400+4900+5600cos 150° 

F=√ 11300+5600 . -√3/2 

F =√11300+2800.-√3 

F=10√113-28√3 

F=10√113-(28x1.73) 

F=10√113-48.44 

F=10√64.56 

F=10×8.034 

F 80.34N



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