Question

8.
The magnitudes of two vectors P and Q differ by 1. The magnitude of their resultant makes an angle
of tan-|(3/4) with P. The angle between P and Q is
1) 450
2) 00
3) 180°
900​

Answer 1

ANSWER :-

tan theta is 3/4

then perpendecular of triangle is 3

and base of the triangle is 4

using pytogorous therem h^2=s^2+s^2

then h^2=3^2+4^2,h=5.

Using formulae r^2=a^2+b^2+2ab cos theta

we get 5^2=3^2+4^2+2ab coos theta

we get 25=25+2ab cos theta

then 2ab cos theta=0,cos theta=o

as cos theta is 0 ,then theta =90

Answer 2

180 will be correct answer.