NEET Physics Mathematical Tools Questions Solved


If A=B+C and magnitudes of A, B and C are 5, 4 and 3 units respectively, the angle between A and C is -

(A)  sin-1 3/4

(B)  cos-1 4/5

(C)  cos-1 3/5

(D)  π/2

Concept Videos :-

#20 | Vectors: Introduction
#21 | Vectors: Addition
#22 | Vectors : Subtraction

Concept Questions :-

Resultant of Vectors

(C)

A= 5B= 4C= 3Also,  52= 42+32           A2= B2+C2                   Pythagoras theoremSo   BC

 θ: Angle between A & C

If we talk about sides of right-angled triangle

 

tan 53°= 43Also, cos 53°= 35So, angle θ= cos-1 35

Difficulty Level:

  • 7%
  • 15%
  • 64%
  • 15%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 21, 2019)