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A submarine is travelling toward a stationary detector.
If the submarine emits a 260-Hz sound that is received by the detector as a 262-Hz sound, how fast is the submarine travelling?
Use 1533 m/s for the speed of sound in seawater.
Force: Force may be defined as a push or a pull upon an object. In the English system the pound (1b) is used to express the value of a force. For example, we say that a force
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what is motion
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Three coils each having resistance 3 Ω and inductive reactance 4Ω are linked (i) instar and (ii) in delta to a 415V, 3-phase supply. Calculate for each connection (a)
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