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Unformatted text preview: and time. Knowing that the radar station is b=4 km from the launch pad at point B, determine approximately the speed of the rocket if =47 at a point in time and =48 0.5 seconds later. Write out the expression for velocity in Polar Coordinates e r e r v r + = m r r 9 . 5977 48 cos 4000 2 2 = = s rad s / 0349 . / 2 5 . 1 2 = == m r r r r ave ave 5 . 5921 2 2 1 = + = s m v v e e v r / 306 7 . 206 6 . 225 0349 . 5 . 5921 6 . 225 2 2 = + = + = Reflection: The speed is equal to 684 mph when the rocket is at an altitude of 14,575 ft. Since airplanes travel around 450 mph at cruising altitude, this number seems reasonable although possibly on the low side for a rocket?...
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 Spring '05
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