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
        
Respected sir,
How to know when to use scalar product i.e. dot  between two vectors and vector product i.e cross between two vectors while solving the application based questions ? While finding the perpendicular of a parallelogram given the area we use vector product for vectors for finding area, but why and how will we know when to use what?
one year ago

Answers : (1)

Rajdeep
231 Points
							
Hello there!
 
According to me, there is no such rule to identify when to use what (scalar product or vector product).
 
You need to understand the question and the approach to solve the question.
 
If in the question, it is stated that the vectors A and B are perpendicular,
use dot product = 0, as dot product of \small A.B = ABcos\Theta, and cos 90 = 0.
 
If in the question, it is stated that the vectors A and B are parallel,
use cross product = 0, as cross product of \small A\times B = ABsin\Theta, and sin 0 = 0.
 
If two vectors A and B represent the two adjacent sides of a parallelogram,
then the area of the parallelogram is the cross product (or vector product) of the two vectors.
 
If two vectors A and B represent the two sides of a triangle,
then the area of the triangle is half the cross product of the two vectors.
 
 
one year ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

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


Course Features

  • 110 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