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Q. In the evening you go back to the swimming pool with your friends. The object is still lying on the bottom of the pool in the same location as before, but since it's dark now, you use a flashlight to show it to your friends. Remembering the apparent location of the object in daylight, where should you aim to illuminate the object with the flashlight? Assume you hold the flashlight at eye level.

Q. One way to create artificial gravity in a space station is to spin it.If a cylindrical space station 250 in diameter is to spin about its central axis, at how many revolutions per minute () must it turn so that the outermost points have an acceleration equal to?

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