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Q. Two positive charges of 7.7 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.75. If they are originally far apart and then one charge is slowly moved closer to other charge. At what distance would the charge at rest begin to move if its mass is 4.2 grams? Answer in meters.

Q. The speed of sound in bone is 3500 m/s. How much time does it take the echo of a sound wave to travel from the back of the bone to the front of the bone if the bone is 2.50 cm thick?

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