find the unit vector in direction of p= 4j- 8k
Answers
Answered by
3
Answer:
We have:
3
i
+
4
j
−
k
Let
u
=
3
i
+
4
j
−
k
.
Unit vectors are of the form
ˆ
u
=
u
|
u
|
:
⇒
ˆ
u
=
3
i
+
4
j
−
k
|
3
i
+
4
j
−
k
|
⇒
ˆ
u
=
3
i
+
4
j
−
k
√
3
2
+
4
2
+
(
−
1
)
2
⇒
ˆ
u
=
3
i
+
4
j
−
k
√
9
+
16
+
1
⇒
ˆ
u
=
3
i
+
4
j
−
k
√
26
Answered by
0
Answer: =>1/√80 x (4j-8k)
Explanation:
vector P = 4j - 8k
Magnitude of P = |P| = √[(4x4) + (8x8)] = √80
now, unit vector of P = P/|P|
=>1/√80 x (4j-8k) = answer :)
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