Esther is experiencing lower back pain after lifting tools and materials all day at her worksite. What type of hazard is most likely to have caused her symptom? Select the best option. A: Ergonomic B: Physical C: Biological D: Chemical // Help ASAP please!!

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.