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NDA Math Vector Algebra
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© examsnet.com
Question : 46
Total: 101
If
→
a
and
→
b
are vectors such that
|
→
a
|
=
2
,
|
→
b
|
=
7
and
→
a
×
→
b
=
3
⋀
i
+
2
⋀
j
+
6
⋀
k
,then what is the acute angle between
→
a
and
→
b
[NDA I 2018]
30
°
45°
60°
90°
Validate
Solution:
s
i
n
θ
=
|
→
a
×
→
b
|
|
→
a
|
|
→
b
|
=
7
2
×
7
=
1
2
⇒
θ
=
30
°
© examsnet.com
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