What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of 15 ω? the resistivity of this metal is 1.68 × 10-8 ω ∙ m?

The resistance of the cylindrical wire is .

Here is the resistance, is the length of the wire and is the area of cross section. Since the wire is cylindrical . Rearranging the above equation,

Here .

Substituting numerical values,

The length of the wire is

an obstruction

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.