4.
A vector i of length 10 units makes an angle of 6 with the vector B of length 6 units. Find the
magnitude of the vector difference - B & the angle it makes with vector A.
UD0026
Answers
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Answer:
A
−
B
∣
∣
∣
=
A
2
+B
2
−2ABcosθ
=
(10)
2
+(6)
2
−2(10)(6)cos60
∘
=2
19
tan α=
10−6cos60
∘
6sin60
∘
=
10−3
6×
3
/2
=
7
3
3
⇒α=tan
−1
(
7
3
3
)
Explanation:
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