The thermal contact conductance at the interface of two 1-cm-thick copper plates is measured to be 18,000 w/m2 · c. determine the thickness of the copper plate whose thermal resistance is equal to the thermal resistance of the interface between the plates.

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

How to tell if a molecule is polar or nonpolar with electronegativity

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?