Posted by Rachel | Posted in Coffee and Accessories | Posted on 11-01-2011
Tags: 6 coffee filter cone, 6 coffee filter holder, 6 coffee filters, 6 coffee filters amazon, blog, number 6 coffee filters, photo, photos, social, web2.0
How to find kinetic energy of the air from the energy principle?
A coffee filter of mass 1.5 grams dropped from a height of 3 m reaches the ground with a speed of 0.6 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air.
________J
Ea = mgh – ½mV² where V is the velocity at impact
Ea = .0015*9.8*3 – (.0015/2)*.6² = .0438 J
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