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July 22, 2014

July 22, 2014

Posted by **Frankie** on Friday, August 19, 2011 at 1:13pm.

- trig -
**Henry**, Friday, August 19, 2011 at 7:14pmVp=140mi/h @ 280 deg.,CCW. = Velocity of the plane.

Vw = 20mi/h @ 190 deg.CCW. = Velocity of the wind.

X = hor. = 140cos280 + 20cos190,

X = 24.2 + (-19.7) = 4.5mi/h.

Y = ver. = 140sin280 + 20sin190,

Y = -137.87 + (-3.47) = -141.34mi/h.

tanA = Y/X = -141.34/4.5 = - 31.41,

A = -88.2 deg,CW = 360 - 88.2 = 271.8

deg, CCW. = Direction.

R = X/cosA = 4.5/cos271.8 = 141.4mi/h = Magnatude.

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