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September 20, 2014

September 20, 2014

Posted by **kayleigh** on Friday, April 12, 2013 at 1:25pm.

- trig -
**Damon**, Friday, April 12, 2013 at 1:44pmMathematicians should not write navigation problems:

an airplane has an airspeed of 430 miles per hour ***ON*** a ****HEADING**** of 135 degrees. the wind velocity is 35 miles per hour in the direction N30degreesE. Find the resultant speed and direction of the plane.

Usually we say where the wind is FROM but this seems to imply that the air is moving N 30 E . Again mathematicians do not get this stuff.

North speed = 430 cos 135 + 35 cos 30

= -273 mph or 273 south

East speed = 430 sin 135 + 35 sin 30

= 322 mph

total speed = sqrt(273^2+322^2) = 422 mph

angle of travel east of south = A

tan A = 322/273

A = 49.7

so actual direction over ground is

180 - 49.7 = 130.3 degrees East of North

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