Please can someone help me on this question:
Two forces of magnitude 5N and 6N act on the point 0. The angle between the two forces is X
The resultant of the two forces has magnitude 5N.
Calculate the value of X.
Many thanks,
languages
Please can someone help me on this question:
Two forces of magnitude 5N and 6N act on the point 0. The angle between the two forces is X
The resultant of the two forces has magnitude 5N.
Calculate the value of X.
Many thanks,
languages
This is basic law of cosines: $\displaystyle c^2 = a^2 + b^2 - 2ab \cos C$
so you have
$\displaystyle 5^2 = 5^2 + 6^2 - 2(5)(6) \cos C$
$\displaystyle 0 = 36 - 60 \cos C$
$\displaystyle 60 \cos C = 36$
$\displaystyle \cos C = \frac{36}{60}$
$\displaystyle \cos C = \frac{3}{5}$