Physics, 04.03.2020 05:29, chrissulli4605
A simple procedure for measuring surface convection heat transfer coefficients involves coating the surface with a thin layer of material having a precise melting point temperature. The surface is then heated and, by determining the time required for melting to occur, the convection coefficient is determined. The following experimental arrangement uses the procedure to determine the convection coefficient for gas flow normal to a surface. Specifically, a long copper rod is encased in a super insulator of very low thermal conductivity, and a very thin coating is applied to its exposed surface. If the rod is initially 25 degree C and gas flow for which h = 200 W/m2 * K and T infinity = 300 degree C is initiated, what is the melting point temperature of the coating if melting is observed to occur at t = 400 s?
Answers: 1
Physics, 22.06.2019 14:20, timothyashburn8
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.
Answers: 1
Physics, 22.06.2019 18:30, Felici8617
4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.
Answers: 2
A simple procedure for measuring surface convection heat transfer coefficients involves coating the...
Mathematics, 28.08.2020 23:01
Mathematics, 28.08.2020 23:01
History, 28.08.2020 23:01
Chemistry, 28.08.2020 23:01
Advanced Placement (AP), 28.08.2020 23:01
Mathematics, 28.08.2020 23:01
Mathematics, 28.08.2020 23:01
Mathematics, 28.08.2020 23:01
Mathematics, 28.08.2020 23:01