The temperature distribution across a wall 1m thick at a certain time T(x)=a+b(x)+2(x)^2.where T is in 0degree, x in meters. A=900c, b= -300c/m, c= -50c/m^2. A uniform heat generation Q=1000w/m^2, and area is 10m^2, p=1600kg/m^2, k=40w/m^2, cp=4kj/kg (1) determine the rate of heat transfer entering the wall (x=0), leaving the wall (x=0)
(2) determine the rate of energy stored in the wall
(3) time rate of the temperature change at (x=0,0.25 and 0.5m)

The force will determine the acceleration.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.