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Blazing goIITian

Joined:	14 Aug 2007
Post:	910

4 Nov 2007 16:49:26 IST

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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

Comments (4)

aditi garg

Scorching goIITian

Joined: 2 Nov 2007

Posts: 288

4 Nov 2007 18:53:24 IST

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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

Arshdeep Singh Malhan

Blazing goIITian

Joined: 14 Aug 2007

Posts: 910

4 Nov 2007 21:44:48 IST

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

Akhil prabhakar

New kid on the Block

Joined: 3 Nov 2007

Posts: 5

5 Nov 2007 10:18:19 IST

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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

Arshdeep Singh Malhan

Blazing goIITian

Joined: 14 Aug 2007

Posts: 910

5 Nov 2007 20:52:59 IST

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you are 100% right akhilp

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