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Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.