Question

5
Given that P.0R and P+Q=R. The angle between P & is
(1) 0
(
2)​

Answer 1

Explanation:

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Given that p vector+q vector=rvector and p+q=rthen angle between p vector & q vector

NIKHIL NIKHIL kumar Pandey PANDEY 2nd Oct, 2018

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Answer (1)

Vikas gehlot

2nd Oct, 2018

Magnitude Sum of Two vectors Vector P and Vector q is given by

r^2 =p^2+q^2+2pqcos($) __________________________(i)

here $ indicates angle between them.

We are given

r=p+q

so Squaring both the sides we get

r^2=p^2+q^2+2pq ______________________(ii)

From (i) and (ii) we can write

p^2+q^2+2pqcos($)=p^2+q^2+2pq

therefore 2pq=2pqcos($)

cos($)=1

therefore $=0

So angle between p vector and q vector is 0 degree.