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Esperanza uses a 35-mm camera with a standard lens of focal length 70.0 mm to take a photo of her son Sam, who is 1.2 meter tall and standing 3.0 meter away.
(a) Find what must be the distance between the lens and the film to get a properly focused picture?
(b) Determine what is the magnification of the image?
(c) Determine the height of the image of Sam on the film?
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question a car is moving on a at horizontal circular track of radius 120 m. the speed of the car is constant 15ms . the
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The sound level of a single vacuum cleaner is about 75dB and a television is about 55dB. What is the sound level number
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