Homework Help: Math

Posted by Mei on Thursday, December 1, 2011 at 10:32pm.

"A ship leaves port on a bearing of 34.0 degrees and travels 10.4 mi. The ship then turns due east and travels 4.6 mi. How far is the ship from port, and what is its bearing from port?"

I would like to know how the actual steps in finding the answer please!

Math - Steve, Friday, December 2, 2011 at 5:22am
just start drawing your lines, and figure out how far each leg of the trip takes the ship. Start at (0,0)

go 10.4 mi at N34°E puts you at

(10.4*sin34°,10.4*cos34°) = (5.82,8.62)

Now go E for 4.6, and that adds (4.6,0) to the displacement. Now you are at

(10.42,8.62)

The new bearing θ is given by

tanθ = 10.42/8.62 = 1.2088
θ = 50.4°
distance is sqrt(182.88) = 13.52

or, 13.52mi at N50.4°E

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