Mechanical Engineering - Engineering Mechanics - Discussion
Discussion Forum : Engineering Mechanics - Section 3 (Q.No. 42)
42.
The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then
Discussion:
12 comments Page 2 of 2.
Vinay BEL said:
5 years ago
Tan a= Qsin0/P + Qcos0.
When Q is double, then.
Tan90 = 2Qsin0/P + 2Qcos0.
We know tan90 = infinity.
P + 2Qcos0 = zero.
P = -2Qcos0.
R = root P^2 + Q^2 + 2PQCOS0.
Putting P = -2Qcos0.
R = Q.
When Q is double, then.
Tan90 = 2Qsin0/P + 2Qcos0.
We know tan90 = infinity.
P + 2Qcos0 = zero.
P = -2Qcos0.
R = root P^2 + Q^2 + 2PQCOS0.
Putting P = -2Qcos0.
R = Q.
(3)
Anonymus said:
4 years ago
Thanks @Raj.
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