David stands 2.5 m in front of a plane mirror

(a) How far from David is his image in the mirror?
(b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?
(c) If David is 180 cm tall, how tall is his image in the mirror?


(a) 5.0 cm (b) 3.0 m/s (c) 180 cm

Physics & Space Science

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A 10.0 kg mass is attached to the end of a 2.00 m brass rod with a 1.00 mm diameter. If the tensile modulus of brass is then the period of the simple harmonic motion of the mass is

A. 0.175 sec. B. 0.105 sec. C. 0.133 sec. D. 0.145 sec. E. 0.167 sec.

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Fill in the blank(s) with the appropriate word(s).

Physics & Space Science