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A fire truck carries a speed of 100 km/h and its siren sounds at a frequency of 900 Hz; what apparent frequency does an observer hear when he sees him approaching?
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Bernie drove home from a vacation in 1.5 hours. he traveled a total distance of 60 miles. what was his average speed in miles per hour? a. 60 mph b. 90 mph c. 40 mph d. 55mph
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Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places
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Which radioisotope is used in dating geological formations?
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A fire truck carries a speed of 100 km/h and its siren sounds at a frequency of 900 Hz; what apparen...
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