Homework Help: Physics

Posted by Sam on Thursday, November 8, 2012 at 9:00am.

The pilot of an aircraft wishes to ﬂy due
west in a 52.6 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 154 km/h.

A.) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of ◦ (degrees)

B.) What should the plane’s speed be relative to the ground? Answer in units of km/h.

Physics - Henry, Friday, November 9, 2012 at 7:55pm
X = -154 km/h.
Y = -52.6 km/h = Speed of wind.

A. tanAr = Y/X = -52.6/-154 = 0.34156.
Ar = 19o = Reference angle.
A = Ar + 180 = 19 + 180 = 199o. = 19o
South of West.

The plane should head 19o North of West.

B. V^2 = X^2 + Y^2.
V^2 = (-154)^2 + (-52.6)^2 = 26482.76
V = 163 km/h.

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