A spherical conductor with a 0.413 m radius is initially uncharged. How many electrons should be removed from the sphere in order for it to have an electrical potential of 7.50 kV at the surface

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

your answer is, orbit around the nucleus