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q1 an ambulance travelling at 39 ms approaches a

Q1. An ambulance travelling at 39 m/s approaches a car heading in the same direction at a speed of 19 m/s. The ambulance driver has a siren sounding at 540 Hz. At what frequency does the driver of the car hear the siren? (Imagine a temperature of 20° C.)

Q2. A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W.

What is the comparable resistance of light string?

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