Which direction (toward the sun/away from the sun) is the north pole pointing when it is summer for the southern hemisphere?

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

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

It is really hard for me right know