Two police cars have identical sirens that produce sound of frequency of 570 Hz. A stationary listener is standing between two cars
One car is parked and the other is approaching the listener and both have their sirens on. The listener measures 9.0 beats per second. Find the speed of the approaching police car. The speed of sound is 340 m/s.
5.3 m/s
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If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter?
a. must be positive b. must be equal in magnitude to that on M c. must be negative d. must be greater in magnitude than that on M
The rate at which a transformer transfers energy is called
A) electromagnetic induction. B) transformer efficiency. C) power.
In a supersaturated solution,
a. the solvent has become the solute. b. the normal solubility is exceeded. c. more solute than solvent is present. d. the dissolved and undissolved solute are in equilibrium.
A violinist discovers while tuning her violin that her string is flat (has a lower frequency). She should
A. tighten the string. B. loosen the string. C. play faster.