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A tether ball is on a 2.0 m long string that makes an abd of 60 degrees with vertical as it moves around the poke in a horizontal plane. If the mass of the ball is 0.40 kg, what is the balls speed?
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Question: A slide projector needs to create a 84 cm high image of a 2.0 cm tall slide. The screen is 240 cm from the slide. Assume that it is a thin lens. (a) What focal length does the lens need? cm (b) How far should y ...
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