11. A displacement vector, at an angle of 30° with y-axis has an x-co

1.	11. A displacement vector, at an angle of 30° with y-axis has an x-component of 10 units. Then the magnitudeof the vector is-(A) 5.0(B) 10(C) 11.5D)20
Answer» given the x component is 10 units and the angle to y axis is = 30° so the angle to x axis will be = 90-30 = 60° Let the magnitude be Mso, Mcos60° = 10 or , M/2 = 10 ......... (cos60° = 1/2) so, M = 2*10 = 20 units

11. A displacement vector, at an angle of 30° with y-axis has an x-component of 10 units. Then the magnitudeof the vector is-(A) 5.0(B) 10(C) 11.5D)20

Answer»

given the x component is 10 units

and the angle to y axis is = 30° so the angle to x axis will be = 90-30 = 60°

Let the magnitude be Mso, Mcos60° = 10 or , M/2 = 10 ......... (cos60° = 1/2)

so, M = 2*10 = 20 units