Two forces of magnitude 10N and 15N are acting at a point. The magnitude of their resultans is 20N . Find the angle between them
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R²= F1² + F2² + 2*F1*F2 cos theta
20²= 10²+15²+2*10*15 cos theta
400=100+225+300 cos theta
400=325+300cos theta
400-325=300 cos theta
75/300= cos theta
1/4= cos theta
theta =cos-¹ 1/4. ( cos inverse of 1/4)
20²= 10²+15²+2*10*15 cos theta
400=100+225+300 cos theta
400=325+300cos theta
400-325=300 cos theta
75/300= cos theta
1/4= cos theta
theta =cos-¹ 1/4. ( cos inverse of 1/4)
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