A 20.0m -long cable consists of a solid-inner, cylindrical, nickel core 11.0cm in diameter surrounded by a solid-outer cylindrical shell of copper 11.0cm in inside diameter and 22.0cm in outside diameter. The resistivity of nickel is 7.8*10^-8 ohm*m. What is the resistance of this cable? If we think of this cable as a single material, what is its equivalent resistivity?

When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.

How do you count the total number of atoms present on one side of a chemical equation?