A plane P at a constant altitude of 6 km and at a constant speed of 600 km/h A is flying directly away from an observer at O on the ground. The point A on the path of the plane lies directly above O. Let the distance AP be x km, and let the angle of elevation of the plane from the observer be 0. a Show that 0 = tan-'. 600 km/E 6 km -16 de b Show that dt - 3600 radians per hour. %3D x2 + 36 c Hence find, in radians per second, the rate at which 0 is decreasing at the instant when the distance AP is 3 km.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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15 A plane P at a constant altitude of 6 km and at a constant speed of 600 km/h
A
P
is flying directly away from an observer at O on the ground. The point A on
the path of the plane lies directly above O. Let the distance AP be x km, and
let the angle of elevation of the plane from the observer be 0.
a Show that 0 = tan¬1.
600 km/h
6 km
do
b Show that
dt
-3600
radians per hour.
x² + 36
c Hence find, in radians per second, the rate at which 0 is decreasing at the instant when the distance
AP is 3 km.
Transcribed Image Text:15 A plane P at a constant altitude of 6 km and at a constant speed of 600 km/h A P is flying directly away from an observer at O on the ground. The point A on the path of the plane lies directly above O. Let the distance AP be x km, and let the angle of elevation of the plane from the observer be 0. a Show that 0 = tan¬1. 600 km/h 6 km do b Show that dt -3600 radians per hour. x² + 36 c Hence find, in radians per second, the rate at which 0 is decreasing at the instant when the distance AP is 3 km.
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