O gás contido em um recipiente cilíndrico de êmbolo móvel sofre uma transformação na qual recebe de uma
fonte térmica 800 cal. Simultaneamente, executa-se
sobre o gás um trabalho de 209 J. Sabendo-se que 1 cal
= 4,18 J, determine a variação de energia interna do gás.

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

Which lists correctly orders nuclear reactions from most radioactive waste generated to least waste generated within a given period of time? o a. radioactive decay, nuclear fission, nuclear fusion o b. radioactive decay, nuclear fusion, nuclear fission o c. nuclear fusion, nuclear fission, radioactive decay o d. nuclear fission, nuclear fusion, radioactive decay