Consider uniform thermal energy generation inside a one-dimensional plane wall of thickness L with one surface held at Tsâ and the other surface insulated.
(a) Find an expression for the conduction heat flux to the cold surface and the temperature of the hot surface Tsâ, expressing your results in terms of k, q', L, and Tsâ.
(b) Compare the heat flux found in part (a) with the heat flux associated with a plane wall without energy generation whose surface temperatures are Tsâ and Tsâ.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?