An uninsulated steam pipe through a room in which the air and walls are at 250C. The outside diameter of the pipe is 70mm, and its surface temperature and emissivity are 2000C and 0.8, respectively. What are the surface emissive power and irradiation

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Positrons are spontaneously emitted from the nuclei of

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)