Karin wants to remove iron shavings from a pile of sand. Karin has refrigerator magnets. She also has batteries, insulated wire, iron bolts, and tape. Select the correct button to show whether each statement is true of an electromagnet, a permanent magnet, or both. Some rows may have more than one button selected.

What is hidden during a lunar eclipse? isn't the moon hidden?

Both speed and velocity measure how fast something is moving. however, since speed is not a it does not require a(n question 6 options: a) quantity , unit b) magnitude, unit c) scalar, direction d) vector, direction

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?