Asteel steam pipe has outside diameter of 25 cm, wall thickness of 1.25 cm and length of 10 m. the outside surface of the steel pipe is maintained at a temperature of 160°c. the pipe is insulated with a 10 mm layer of fiberglass insulation (k = 0.025 wm-1k-1). the thermal conductivity of the pipe material is 36 wm-1k-1. if the insulated pipe is exposed to a wind flowing across at 1 ms-1 and 20°c, calculate the outside surface temperature of the insulation. notes: (i) properties of air at atmospheric pressure can be found in the back of the test script (page 9) hint: start by guessing the final temperature in the range of 30-50 °c.

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.