Answer to Question #251477 in Mechanics | Relativity for Max

Question #251477

Considering vector A = 100 N, directed to the East and vector B = 75 N, 60° from positive x-axis, capture the image of the resultant vector A - B. Then, try to find the resultant vector using the Law of Sines and Cosines


1
Expert's answer
2021-10-15T10:24:12-0400

Explanations & Calculations





  • Angle POQ = 60 degrees.
  • To calculate the magnitude of PQ, apply cosine law to POQ triangle.

cos60=1002+752PQ22×75×100PQ2=8125N2PQ=2513N\qquad\qquad \begin{aligned} \small \cos 60 &=\small \frac{100^2+75^2-PQ^2}{2\times75\times100}\\ \small PQ^2 &=\small 8125 \,N^2\\ \small PQ &=\small 25\sqrt{13}\,N \end{aligned}

  • To find the direction of the resultant vector, consider the vector addition on the POQ triangle,

PQ=PO+OQ=(B)+A=AB\qquad\qquad \begin{aligned} \small \vec{PQ}&=\small \vec{PO}+\vec{OQ}\\ &=\small (-\vec{B})+\vec{A}\\ &=\small \vec{A}-\vec{B} \end{aligned}

  • Direction is from P to Q.

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