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 3 years ago
A man walks along a straight path at a speed of 4ft/s. A searchlight is located on the ground 20ft from the path and is kept focused on the man. At what rate is the searchlight rotating when the man is 15 ft from the point on the path closest to the searchlight.
 3 years ago
A man walks along a straight path at a speed of 4ft/s. A searchlight is located on the ground 20ft from the path and is kept focused on the man. At what rate is the searchlight rotating when the man is 15 ft from the point on the path closest to the searchlight.

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krypton
 3 years ago
Best ResponseYou've already chosen the best response.1Now note that tan(y) = x=20, so that sec^2y *dy/dt=1/20 dx/dt At the instant described in the problem, x = 15 and the hypotenuse of the above triangle thus has length 25, so we compute: (25/20)^2 dy/dt=1/20*4 ==>dy/dt=1/2*400/625 =16/125 rad/sec

dejongrittman
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you so mcuh! :)
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