an aircraft flies from its base 200 km on a bearing 162 degree, then 350km on a bearing 260 degree and then returns directly to
base. Calculate the length and bearing of the return journey
1 answer:
X=200cos(162+90)+350cos(260+90)
y=200sin(162+90)+350sin(260+90)
x≈282.88
y≈-250.99
So the length of the return trip is:
d^2=x^2+y^2
d^2≈143017.0745
d≈378.18
tanα=-250.99/282.88
α=arctan(-250.99/282.88)
α≈-41.58° that's the standard angle relative to the positive x-axis...
We need to be going in the exact opposite direction when returning so...
180-41.58=138.42° again this angle is standard notation. To convert this to a bearing we need to subtract 90°...
So the bearing is 138.42-90=48.42°
So the return trip will be 378.18km on a bearing of 48.42°
(I have assumed that the bearing was relative to true north, or the positive y axis....)
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