A train station bell gives off a fundamental tone of 500 Hz as the train approaches the station at a speed of 30.0 m/s. If the speed of sound in air is 339 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 456 Hz
b. 544 Hz
c. 250 Hz
d. 530 Hz
e. 339 Hz
b
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a. 200 Hz c. 600 Hz b. 400 Hz d. none of the above
A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg×°C.)
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