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Q. A coffee filter of mass 1.5 grams dropped from a height of 1 m reaches the ground with a speed of 0.7 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.

Q. If the accelerating plates are 1.70 apart, and have a potential difference of 2.30×10^4 , what is the magnitude of the uniform electric field between them?

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