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Question1

Two train whistles have an identical frequency of 157 Hz. Train A is motionless in the station and sounds its whistle.

Meanwhile Train B is pulling into the station and sounds its whistle. The conductor of Train B hears 3.70 beats every second.

How fast is Train B moving? The speed of sound is 340. m/s.

Question2

Two small non conducting spheres have a total charge of 91.0.while placed 1.19 apart, the force each exerts on the other is 10.5 and is repulsive. What is the charge on each? What if the force were attractive?

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