Two triangulation stations A and B are 100km apart having elevations of 178m and 490m respectively. If the visible horizon is tangent to the line of sight at two third from station B, then check whether the two stations are visible or not. If not compute the minimum height of signal required at station B.

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.