1. A room air conditioner causes a temperature change of 6.90 C. What is the temperature change in kelvins?
2. Two 54.6-cm metal rods, one made of copper and one made of aluminum, are placed end to end, touching each other. One end is fixed, so that it cannot move. The rods are heated from 0.0C to 140.0C. How far does the other end of the system of rods move?Coefficients of linear expansionfor aluminum is 23.0 10⁶K¹and for copper is 16.0 10⁶K¹
3. How many hydrogen atoms are present in 622.6g of sucrose (C₁₂H₂₂O₁₁)? (Molar mass of carbon = 12.011g/mol, molar mass of hydrogen = 1.008 g/mol, and molar mass of oxygen = 15.999 g/mol): answer ______10^25 atoms
4. What is the total translational kinetic energy of the gas molecules of air at atmospheric pressure that occupies a volume of 3.90 L?
5. There are two identical containers of gas at the same temperature and pressure, one containing argon and the other neon. What is the ratio of the rms speed of the argon atoms to that of the neon atoms? The atomic massof argon is twice that of neon.
6. The average body temperature of a healthy person is 37.0C. Boltzmann'sconstant is 1.38 10²³J/K. What is the average kinetic energy of the gas molecules in the lungs?
7. The average body temperature of a healthy person is 37.0C. Boltzmann'sconstant is 1.38 10²³J/K. If a fever increases the temperature to 38.4C, by what percentage does the average kinetic energy of the molecules increase?
8. Estimate the average distance between molecules in air at 0.0C and 3.90 atm.
9. A long, narrow steel rod of length 2.5000 m at 31.1C 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?
10. 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 of1.00 10⁷Pa. Assumethat the diver breathes 0.500L/s of air. Density of fresh water is 1.00 10³kg/m³. How long will the tank last at depths of 5.10 m?