A charge of -2.6 times 10-9 c is at the origin and a charge, Ask an Expert

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Q. Standing at a crosswalk, you hear a frequency of 590 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 515 Hz. Determine the ambulance's speed from these observations.

Q. A charge of -2.6 × 10-9 C is at the origin and a charge of 8.1 × 10-9 C is on the x-axis at x = 3 m. At what two locations on the x-axis (xpositive, xnegative) is the potential zero?

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