Posted by **Chris** on Saturday, May 9, 2009 at 10:08pm.

An aircraft passes over you with a velocity of 950 km/h at an altitude of 11000 meters. What is the angular velocity two minutes later?

**this problem is tricky because 2 minutes later the aircraft is no longer tangent to the circle.

- physics -
**drwls**, Sunday, May 10, 2009 at 12:45am
First do the conversion

950 km/h = 263.9 m/s

Measured from the instant the plane is overhead, the Y coordinate remains

y = 11,000m,

and the X coordinate is

x = 263.9 t, if t is in seconds

The angle from zenith direction (straight up) is

A(t) = arctan (x(t)/y)

What you want is dA/dt. It equals

dA/dt = (dA/dx)*(dx/dt)

= {1 /[1 + (x/y)^2]}*(1/y)*263.9

Evaluate this at t = 120 s, when x = 31,668 m and y = 11,000 m. The answer will be in radians per second

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