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Grade: 10
        Two vectors have magnitudes 3 unit and 4 unit respectively. What should be the angle between them if the magnitude of the resultant is (a) 1 unit, (b) 5 unit and (c) 7 unit.
5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
							Sol. |a ⃗ | = 3m |b ⃗ | = 4
(a) if R = 1 unit ⇒  √(3^2+4^2+2.3.4.cos⁡θ ) = 1
Θ = 180°
(b) √(3^2+4^(2 )+22.3.4.cos⁡θ )   = 5
Θ = 90°
(c) √(3^2+4^2+2.3.4.cos⁡θ ) = 7
θ = 0°
Angle between them is 0°.

						
5 years ago
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