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Mechanics

Blazing goIITian

 Joined: 14 Aug 2007 Post: 910
4 Nov 2007 16:49:26 IST
0 People liked this
4
647
vector problem
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Mechanics

two forces p and q acting at a pt. are such that if p is reversed the direction of resultant is turned by 90 degrees,then
P=Q
P=2Q
P=root2Q
none

Scorching goIITian

Joined: 2 Nov 2007
Posts: 288
4 Nov 2007 18:53:24 IST
1 people liked this

i think the answer should be p=q......
c whn we apply the formula tan @=q sin@/p+qcos@...........1
whn p ir reversed thn thn angle between p and q will be 180-@
and tan(90-@)=qsin(180-@)/ p+q(180-@).....2

==multiply 1 and 2
u get 1=q^2 sin^2@/p^2-q^ cos ^@
which further gives p^2=q^2
=p=q

Blazing goIITian

Joined: 14 Aug 2007
Posts: 910
4 Nov 2007 21:44:48 IST
0 people liked this

i don't know the answer but i think you are right

New kid on the Block

Joined: 3 Nov 2007
Posts: 5
5 Nov 2007 10:18:19 IST
1 people liked this

I agree with previous a but think htat it can also be done in the following manner.
1st find the resultant b/ween P,Q.. Then find the resultant -P & Q..
As the Angle change b/ween the 2 R's is 90. Put the relation R1.R2=0

Blazing goIITian

Joined: 14 Aug 2007
Posts: 910
5 Nov 2007 20:52:59 IST
0 people liked this

you are 100% right akhilp

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