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If the observer knows his/her speed is 25.0 m/s and the temperature is 30°C, and hears a frequency of 450.0 Hz, what is the frequency heard by the source. (Please provide calculations to compare)
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One cubic meter (1.00m^3) of concrete has a mass of 2.30E+3kg, and 1.00m^3 of copper has a mass of 8.92E+3kg. Find the radius of an concrete sphere whose mass is the same as that of an copper sphere of radius 1.28cm?
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