MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        

The resultant of 2 vectors A & B is at right angles to vector A and its magnitude is half of vector B. Find the angle between vectors A & B ?

10 years ago

Answers : (1)

Ramesh V
70 Points
							

let the vectors be A and B and the resultant be R and their magnitides be a,b,r and  let angle btn A and b be x

so A + B = R

also b2 = a2+ r2 ( from figure )

as r = b/2 we have a = 0.86 b

also angle between A and R is 90 , so dot product is zero

A.R=0 or A.(A+B)=0

as A.A = a2.cos 0 = a2

so A.B = - a2

and A.B = a*b*cos x

so cos x = -a2 /ab = -0.86

x=150 degrees

--

Ramesh

5353-656_5850_untitled.JPG

10 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 19 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details