find the magnitude and direction of the resultant of 2 vectors a and b if a is 40 and b is 30 and theta=120°
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Answered by
0
Answer:
=
A
2
+B
2
+2ABcosθ
....(i)
∴tan90
o
=
A+Bcosθ
Bsinθ
⇒A+Bcosθ=0
∴cosθ=−
B
A
Hence, from (i)
4
B
2
=A
2
+B
2
−2A
2
⇒A=
3
2
B
⇒cosθ=−
B
A
=−
2
3
∴θ=150
o
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Answer:
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