6a. The average body temperature of a healthy person is 37.0C. Boltzmann's constant is 1.38 10²³ J/K. What is the average kinetic energy (in Joules) of the gas molecules in the lungs?

6b. The average body temperature of a healthy person is 37.0C. Boltzmann's constant is 1.38 10²³ J/K. If a fever increases the temperature to 39.8C, by what percentage does the average kinetic energy of the molecules increase?

7. Estimate the average distance (in nm) between molecules in air at 0.0C and 1.90 atm.

8. A long, narrow steel rod of length 2.5000 m at 19.4C is oscillating as a pendulum about a horizontal axis through one end. If the temperature drops to 0C, what will be the fractional change in its period?

9. A scuba diver is in fresh water has an air tank with a volume of 0.0100 m³. The air in the tank is initially at a pressure of 1.00 10⁷ Pa. Assume that the diver breathes 0.500 L/s of air. Density of fresh water is 1.00 10³ kg/m³. How long (in minutes) will the tank last at depths of 2.10 m?