8. What is the partial pressure of oxygen in mmHg in dry inspired air at 1atm on a day when the temperature is 15C and 25C, respectively? 9. What is the partial pressure of oxygen of tracheal air in mmHg? Do not use conversion (must show all calculations). State all your assumptions. 10. What is the partial pressure of oxygen at 18,000 feet above sea level in Pascals, mmHg, and inches of water? Do not use conversions (must show all calculations). Hint: Use a property table to find the properties of air at different altitudes. 11. Assuming that a person has an average tidal volume of 500ml and 12 breaths per minute, how much CO2 is produced at BMR per minute, per hour, and per day? In a classroom of 30 students how much CO2 is produced during a typical 90 minute lecture? The local temperature is 20C with 45% relative humidity. 12. The global population is currently about 8 billion people. Consider the conditions in problem 11 for the average person. How much CO2 is produced collectively in a year by the earth's population? Approximately what percentage is this of the total combined global production of CO2 from all sources? Conduct a search to find what the total production of CO2 from all sources. 13. You just purchased a new electric car (a Tesla!!). You plan to charge it at home using a 30 Amp, 240V outlet. Considering that the average Tesla uses 34kWh per 100 miles and that in NJ the cost of electricity is about 16 cents per kWh, what is the cost to charge the Tesla for 5 hours? How many miles can you drive on this 5hr charge