Why must soft iron be used with an electromagnet?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

The three types is stress that act on earths rocks are compression, tension, and