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Q. Calculate the moment of inertia of the array of point objects about the vertical axis. Assume m = 1.5kg , M = 3.8kg , and the objects are wired together by very light, rigid pieces of wire. The array is rectangular and is split through the middle by the horizontal axis. Then calculate the moment of inertia of the array of point objects about the horizontal axis. About which axis would it be harder to accelerate this array?

Q. An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate?

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