Alexis is riding her skateboard. What is her kinetic energy if she travels at 5 m/s and her mass is 50 kg?

Most of the volume of an atom is occupied by the

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.

How do you know how many valence electrons an atom has?