Answers: An observer is located in Santiago, Chile. Which part or parts of the celestial sphere would be above the celestial horizon? celestial equator South Celestial Pole none of these North Celestial Pole An observer is located at the North Pole. Which part or parts of the celestial sphere would be above the celestial horizon? 1. North Celestial Pole 2. South Celestial Pole 3. none of these 4. celestial equator

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.