Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle 
with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle is:
(a)
300
(b)
600
(c)
900
(d)
1200
Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle is:
(a)
300
(b)
600
(c)
900
(d)
1200
Question ID - 50249 | SaraNextGen Top Answer
Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle with each other. If the force Q is doubled, then their resultant also gets doubled. Then, the angle is:
(a)
300
(b)
600
(c)
900
(d)
1200
|
Two forces P and Q of magnitude 2F and 3F, respectively, are at an angle |
|||
|
(a) |
300 |
(b) |
600 |
|
(c) |
900 |
(d) |
1200 |
1 Answer
127 votes
Answer Key / Explanation : (d) -
4F2+9F2+12F2cos
=R2
4F2+36 F2+24 F2 cos
=4R2
4F2+36 F2+24 F2cos
=4(13F2+12F2cos
)= 52 F2 +48F2cos
cos 
=
=
127 votes
Answer Link
127