The value of result of two mutually perpendicular is 80 dyne.the result makes an angle 60( degree) with of the forces. Find the magnitudes of the forces
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Answer:
150
0
2
B
=
A
2
+B
2
+2ABcosθ
....(i)
∴tan90
o
=
A+Bcosθ
Bsinθ
⇒A+Bcosθ=0
∴cosθ=−
B
Hence,
4
B
2=A
2
+B
2
−2A
2
⇒A=
3
2
B
⇒cosθ=−
B
A
=−
2
∴θ=150
o
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