Find the angle between force F
®
= (3 ˆi +4 ˆj – 5 ˆk ) unit and displacement d
®
= (5 ˆi + 4 ˆj + 3 ˆk ) unit.
Also find the projection of F on d.
Answers
Answered by
1
Explanation:
F
.
d
=Fdcosθ
⟹cosθ=
Fd
F
.
d
=
50
15+16+15
=
50
46
⟹θ=cos
−1
0.92
Projection of
F
on
d
is given by
d
F
.
d
=
5
2
+4
2
+3
2
15+16+15
=
5
2
46
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