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Q. A homogeneous 85 kg cylinder of radius 29cm is rolling without slipping along a horizontal floor at a speed of 12m/s. What is the minimum amount of work that was necessary to give it this motion?

Q. Suppose you are 69 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 4.90mm?

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