You spot a plane that is 1.36 km north, 2.29 km case, and at an altitude 5.50 km

Question

You spot a plane that is 1.36 km north, 2.29 km case, and at an altitude 5.50 km above your position. (a) How far from you is the plane? km (b) At what angle from due north (in the horizontal plane) are you looking? degree E of N (c) Determine the plane's position vector (from your location) in terms of the unit vectors, letting i be toward the east direction j be toward the north direction, and k be in vertically upward. (d) At what elevation angle (above the horizontal plane of Earth) is the airplane? degree above the horizon

Explanation / Answer

a)

distance, d = sqrt(1.36^2 + 2.29^2 + 5.5^2)

= 6.11 km

b)

angle east of north = atan(2.29/1.36) = 59.3 deg

c)

position vector = 2.29 i + 1.36 j + 5.5 j

angle above the horizontal plane = acos(5.5/sqrt(2.29^2 + 1.36^2 + 5.5^2))

= 25.8 deg

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