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Question1
As at rest, two trains has sirens that release a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. One of the train's moves at 30.5 m/s, and an observer hears a beat frequency of 2.4 beats per second. What is speed of the second train, which travels faster than 30.5 m/s?
Question2
The burner on an electric stove has a power output of 2.0 kW. An 810g stainless steel tea kettle is filled with 20 C water and placed on the already hot burner. If it takes 2.90 min for water to reach a boil, what volume of water, in cm^3, was in the kettle? Stainless steel is mostly iron, so you can suppose its specific heat is that of iron.
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