A red car travels 120 km in one hour. A blue car travels 130 km in the same time. Which car has the greater average speed?

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If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

The energy equivalent of the rest mass of an electron is

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.