At a track meet, three different timers report the times for the winner of a 100-m sprint as 10.55 s, 10.47 s, and 10.38 s. The average is 10.47 s. How would you report the time of the sprinter in a way that reflects the uncertainty of the measurements

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

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.

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?