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Two trains are traveling toward each other at 31.0 m/s relative to the ground. One train isblowing a whistle at 1230 Hz.
(a) What frequency will be heard on the other train instill air?
Hz
(b) What frequency will be heard on the other train if the wind isblowing at 31.0 m/s toward the whistleand away from the listener?
(c) What frequency will be heard if the wind direction isreversed?
A copper rod 20 cm long having a cross-sectional area of 7.0 cm2 is used to connect a boiler maintained at 100 oC to a large block of ice at 0 oC. What is the rate of change in entropy of the boiler
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