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JEE Main Physics Class 11 Motion in a Straight Line and Plane Part 1 Questions
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© examsnet.com
Question : 22
Total: 100
The sum of two forces
→
P
and
→
Q
is
→
R
such that
|
→
R
|
=
|
→
P
|
.
The angle
θ
(in degrees) that the resultant of
2
→
P
and
→
Q
will make with
→
Q
is _________.
[NA 7 Jan. 2020 II]
Your Answer:
Validate
Solution:
|
→
R
|
=
|
→
P
|
⇒
|
→
P
+
→
Q
|
=
|
→
P
|
P
2
+
Q
2
+
2
P
Q
.
cos
θ
=
P
2
⇒
Q
+
2
P
cos
θ
=
0
⇒
cos
θ
=
−
Q
2
P
tan
α
=
2
P
sin
θ
Q
+
2
P
cos
θ
=
∞
(
∵
2
P
cos
θ
+
Q
=
0
)
⇒
α
=
90
°
© examsnet.com
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