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November 1, 2014

Homework Help: Physics

Posted by Constance on Tuesday, December 4, 2012 at 1:06am.

Continuously running exhaust hoods in a university chemistry building keep the inside air pressure slightly lower than outside. A student notices that a 175 N force is necessary to start opening a 1.2 m by 2.3 m door. The door is hinged on one of its 2.3 m vertical sides, and the handle is mounted on the other side. What is the pressure difference between inside and outside? Give in pascals and as a fraction of atmospheric pressure. Hint: Think about torque.

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