Consider a one dimensional plane wall with a thickness 2l. the surface at x = – l is subjected to convective conditions characterized by t[infinity],1, h1, while the surface at x = + l is subjected to conditions t[infinity],2, h2. the initial temperature of the wall is to = (t[infinity],1 + t[infinity],2)/2 where t[infinity],1 > t[infinity],2. write the differential equation and identify the boundary and initial conditions that could be used to determine the temperature distribution t(x, t) as a function of position and time.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

The flow of electrons from one atom to another is called