A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
Cal - MathMate, Thursday, November 11, 2010 at 4:20pm
Use Pythagoras theorem.
x=horizontal distance from station
L(x)=oblique distance from station
dx/dt = horizontal speed = 480 mph
Find dL(x)/dx by differentiation.
= dL(x)/dx * dx/dt
Cal - Anyomous, Thursday, November 11, 2010 at 6:31pm
that makes no sense