Sim posted an Question
February 09, 2021 • 17:42 pm 30 points
  • CSIR NET
  • Physical Sciences

Duncle.com physical sciences (mathematical methods of physics unit vector n on the xy plane is at an angle of 120° with respect to . the angle between vectors ū

duncle.com Physical Sciences (Mathematical Methods of Physics unit vector n on the xy plane is at an angle of 120° with respect to . The angle between vectors ū=ai + bń and v = añ +bj will be 60° if at+h VaA v on tb (A) b=V3a/2 (B) b 2a/3 (C) b a/2 (D) b= a C) üv =ū|| v| cos 60 a (in+b (ni)+ab + ba va +b +2ab cos 120 a +b? +2ab cos120 a2 cos 120° b2 cos 1209+ ab + ba =a+bab 2a2 5ab +262 0 a =Or b 2 how that 1/2 came.can you please explain step by step

1 Answer(s) Answer Now
  • 0 Likes
  • 1 Comments
  • 0 Shares
  • comment-profile-img>
    Lekhika best-answer

    see the attachment. But there is one correction in q. that v= a n+ b i(not j)

    cropped2966897551403279688.jpg
    cropped5479067044666624931.jpg
    eduncle-logo-app

    can u please tell how underroot thing came up!

    eduncle-logo-app

    if u're asking of sqrt in |u|, then it's by defination of dot product., i.e, dot product of vector by itself equals to its magnitude square. so u can find magnitude by taking sqrt of dot product term.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers