Answer to Question #137244 in Trigonometry for Parkire

Question #137244
A sailboat under auxiliary power is proceeding on a bearing 25° north of west at 6,25km/h in still water.Then a tail wind blowing 15km/h in the direction 35° south of west, alters the course of the sailboat.What is the resultant speed and direction of the saiboat (correct to 2 decimal places)?
1
Expert's answer
2020-10-15T18:55:14-0400


From the above diagram, resultant velocity will be


vr=vb+vw\vec v_r=\vec v_b+\vec v_w

Thus,

vr=(vbcos(250),vbsin(250))+(vwcos(350),vwsin(350))vr=(vbcos(250)+vwcos(350),vbsin(250)vwsin(350))vr=(578.73,255.53)    vr=578.732+255.532632.63km/h\vec v_r=(v_b\cos(25^0),v_b\sin(25^0))+(v_w\cos(35^0),-v_w\sin(35^0))\\ \vec v_r=(v_b\cos(25^0)+v_w\cos(35^0),v_b\sin(25^0)-v_w\sin(35^0))\\ \vec v_r=(578.73,255.53)\\ \implies v_r=\sqrt{578.73^2+255.53^2}\approx 632.63km/h

Direction is,


ϕ=tan1(255.53578.73)23.820\phi=\tan^{-1}(\frac{255.53}{578.73})\approx23.82^0

That is , direction is along 23.82023.82^0 north of west.


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