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Q. Water flows at 5.0;{rm L}/{rm s} through a horizontal pipe that narrows smoothly from 10 cm diameter to 5.0 cm diameter. A pressure gauge in the narrow section reads 50 kPa. What does the other pressure gauge read?

Q. How many meters away is a cliff if an echo is heard 0.475 s after the original sound? Assume that sound traveled at 343 m/s on that day.

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