The planetary model of the hydrogen atom consists of an electron in a circular orbit about a proton. the motion of the electron of charge 1.60 × 10−19 c creates an electric current. the radius of the electron orbit is 5.30 × 10−11 m and the electron's velocity is 2.20 × 106 m/s. what is the magnetic field strength at the location of the proton?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Which magnetic property best describes a magnet’s ability to act at a distance? magnets are dipolar. magnets attract only certain objects. magnets have magnetic fields. magnets can transfer their properties to certain materials.

What are the dimensions of the cross section that passes through the points a, f, g, and d?