Question

Find by drawing and calculating the resultant of two vectors, 3units and 4 units inclined to each other at
a) 30
b)90
c) 120 degrees

Answer 1

Answer:

Answer

Let the two vectors be P and Q and their resultant vector be R.

Let the angle between P and Q be θ.

Given: ∣P∣=3, ∣Q∣=4 and ∣R∣=5 units

Magnitude of resultant vector ∣R∣

2

=∣P∣

2

+∣Q∣

2

+2∣P∣∣Q∣cosθ

∴ 5

2

=3

2

+4

2

+2(3)(4)cosθ

We get cosθ=0

⟹θ=90

o

Explanation:

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