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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Physics and Mathematics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Physics and Mathematics

Based on the figure, determine the x and y components of the...

Based on the figure, determine the xx and yy components of the resultant of OA⃗\vec{OA}, BC⃗\vec{BC} and DE⃗\vec{DE}.
Based on the figure, determine the x and y components of the resultant of OA , BC and DE .

Options

  1. A0.98 m0.98 \text{ m} and 1.3 m1.3 \text{ m} respectively
  2. B−0.75 m-0.75 \text{ m} and 1.3 m1.3 \text{ m} respectively
  3. C1.73 m1.73 \text{ m} and 1.0 m1.0 \text{ m} respectively
  4. D1.3 m1.3 \text{ m} and 0.98 m0.98 \text{ m} respectively

Correct answer

A. 0.98 m0.98 \text{ m} and 1.3 m1.3 \text{ m} respectively

Step-by-step solution

Resolving the given vectors into their xx and yy components:

For vector OA⃗\vec{OA}:
OA_x = 2.0 \cos 30^{}^{{}^{\circ}} = 2.0 \times \dfrac{\sqrt{3}}{2} \approx 1.732 \text{ m}
OA_y = 2.0 \sin 30^{}^{{}^{\circ}} = 2.0 \times \dfrac{1}{2} = 1.0 \text{ m}

For vector BC⃗\vec{BC}:
The vector makes an angle of 60^{}^{{}^{\circ}} with the negative xx-axis.
BC_x = -1.5 \cos 60^{}^{{}^{\circ}} = -1.5 \times \dfrac{1}{2} = -0.75 \text{ m}
BC_y = 1.5 \sin 60^{}^{{}^{\circ}} = 1.5 \times \dfrac{\sqrt{3}}{2} \approx 1.5 \times 0.866 = 1.299 \text{ m}

For vector DE⃗\vec{DE}:
The vector is directed along the negative yy-axis.
DEx=0 mDE_x = 0 \text{ m}
DEy=−1.0 mDE_y = -1.0 \text{ m}

The xx-component of the resultant vector is:
Rx=OAx+BCx+DEx=1.732−0.75+0=0.982 m≈0.98 mR_x = OA_x + BC_x + DE_x = 1.732 - 0.75 + 0 = 0.982 \text{ m} \approx 0.98 \text{ m}

The yy-component of the resultant vector is:
Ry=OAy+BCy+DEy=1.0+1.299−1.0=1.299 m≈1.3 mR_y = OA_y + BC_y + DE_y = 1.0 + 1.299 - 1.0 = 1.299 \text{ m} \approx 1.3 \text{ m}
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