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Q. Assume you are 65.00 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 5.0 mm?

Q. A 2.69 rock is attached at the end of a thin, very light rope 1.46 long and is started swinging by releasing it when the rope makes an 11 angle with the vertical. You record the observation that it rises only to the angle of 4.50 with the vertical after swings. How much energy has this system lost during that time?

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