One comment to make on part b of question # 9 of HW # 1. When you specify the wind direction, you specify the direction from which the wind is originating. For example, air associated with a northerly wind (0 degree) flows towards the south. Make sure you enter the direction from which the air is flowing, not the direction towards which the air is flowing. The units to be used as part of the answer should be deg. Details on WebWork units can be found at https://wiki.openwebwork.org/wiki/Units This is a link that is listed in the Homework menu on the 121 website. Frank Wolfs _____________________________________________________________________ Frank L. H. Wolfs e-mail: wolfs@pas.rochester.edu Department of Physics and Astronomy University of Rochester B&L 203A, RC Box 270171 fax: (585) 273 - 3237 284 Hutchison Rd. phone: (585) 210 - 3271 Rochester, NY 14627 http://teacher.pas.rochester.edu/