A particle moves so that its position as a function of time in SI units is r = i + (3.0) t2 j + t k. Write expressions for its velocity and its acceleration as functions of time. Evaluate for t = 5.1 s. i-component of velocity?

The field lines around one end of a bar magnet are shown below based on the diagram, what can you conclude about the pole of the magnet? a.is a south pole because the field hnes spread out from this end b.a north pole because the field lines spread out from this end c.a nouth pole because the field lines enter the magnet at this end d.is a north pole because the field lines enter the magnet at this end