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Q. A thermos contains 155 cm3 of coffee at 85° C. To cool the coffee, you drop two 15-g ice cubes into thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of the coffee? Treat the coffee as if it were water.

Q. Two sounds differ in intensity level by 4.62 dB. What is the ratio of the intensities of these two sounds? (Let I1 be the intensity of the first (higher) sound and I2 be the intensity of the second (lower) sound.)

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