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Q. The plates of a parallel plate capacitor are separated by d = 2.8 cm. The potential of the negative plate is 0 V, and the potential halfway between the plates is +15 V. What is the electric field between plates (take the upward direction as the positive direction)? Be sure to include the proper + or - sign.

Q. Throughout a workout, the football players at State U. ran up the stadium stairs in 63 s. The stairs are 135 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, compute approximately the average power output on the way up. Ignore friction and air resistance.

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