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Question
At what wind speed does $-10^\circ\textrm{C}$ air cause the same chill factor as still air at $-29^\circ\textrm{C}$?

$10 \textrm{ m/s}$

Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 14, Problem 45 (Problems & Exercises) (1:04)

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Video Transcript
This is College Physics Answers with Shaun Dychko. In this wind-chill factor table, we have the temperature of the air that's moving, 5 degree Celsius, 0, negative 10 and here we have the speed at which it's moving in meters per second and then what we have here are all the temperatures, the equivalent temperatures for still air. So, for air that is negative 10 degree Celsius having a equivalent temperature to air that’s not moving of negative 29. So negative. So, air that’s not moving and is negative 29 degree Celsius would feel the same as air that is moving at 10 meters per second with a temperature of negative 10 degree Celsius and so here is the answer by the way, 10 meters per second is the speed at which negative 10 degree air would have to move in order to feel the same as still air at negative 29 degree Celsius.