josephmcintosh4709 josephmcintosh4709
  • 24-01-2020
  • Mathematics
contestada

If v lies in the first quadrant and makes an angle π/3 with the positive x-axis and |v| = 4, find v in component form.

Respuesta :

pedrocarratore
pedrocarratore pedrocarratore
  • 24-01-2020

Answer:

v = <2, 2√3>

Step-by-step explanation:

Let v be the vector of form <x,y>

Since its determinant is |4|, then:

[tex]x^2 +y^2 =4^2=16[/tex]

If it makes a π/3 angle with the positive x-axis, then the tangent relationship yields:

[tex]tan(\pi/3) = 1.732=\frac{y}{x}\\3x^2=y^2[/tex]

Replacing in the first equation:

[tex]x^2 +3x^2 =16\\x=2\\y=\sqrt{16-4}\\ y=2\sqrt 3[/tex]

Therefore, v can be represented in component form as v = <2, 2√3>.

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