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
Vishesh Lal 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 ?

7 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

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details
Get extra Rs. 3,180 off
USE CODE: CART20
  • Statistics and Probability
  • OFFERED PRICE: Rs. 636
  • View Details
Get extra Rs. 127 off
USE CODE: CART20

Ask Experts

Have any Question? Ask Experts

Post Question

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