Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

 

  1. find the angle between the vectors Ä= i^ -2j^ + 3k^ and b vector = -i^ + 2j^ + 3k^

     

Asked by kapilkulhari | 24 Sep, 2019, 09:02: AM
Expert Answer
If angle between vectors a and b is θ , then we have
begin mathsize 14px style cos theta space equals space fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator open vertical bar a with rightwards arrow on top close vertical bar space open vertical bar b with rightwards arrow on top close vertical bar end fraction end style
a = i - 2j + 3k  ,  |a| = ( 1+4+9)1/2 = (14)1/2
 
b = -i +2j +3k ,  |b| = ( 1+4+9)1/2 = (14)1/2
 
a.b = -1 -4 +9 = 4
 
hence cosθ = 4/13 ,  θ = cos-1(4/14) = 73°
Answered by Thiyagarajan K | 24 Sep, 2019, 10:13: AM
CBSE 11-science - Physics
Asked by ankurgoyal616 | 27 Sep, 2022, 03:07: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by mahekacharya87 | 20 Sep, 2022, 10:41: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by rk274268 | 05 Aug, 2022, 01:19: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by halderishan008 | 30 Jul, 2022, 07:28: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by Kattaithihaas | 24 Jul, 2022, 01:23: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by ukalyadab | 18 Jul, 2022, 11:52: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by madhavrao135 | 13 Jul, 2022, 07:33: PM
ANSWERED BY EXPERT

Start your hassle free Education Franchisee and grow your business!

Know more
×