## Use the polynomial expression in the back of the book to estimate Cvig/R at 200 K as a reference.

CO2 is given a lot of credit for global warming because it has vibrational frequencies in the infrared (IR) region that can absorb radiation reflected from the Earth and degrade it into thermal energy. The vibration at  /k = 290K (903cm–1) is particularly important.

(a) Plot Cvig/R versus T for CO2 in the range 200–400 K. Use the polynomial expression in the back of the book to estimate Cvig/R at 200 K as a reference. Also plot the polynomial expression on the same chart as a dashed line.

(b) Use your Internet search skills to learn the wavelength range of the IR spectrum. How many wavelengths are there? What fraction does the wavelength at 903cm–1 comprise? If the Earth’s atmosphere was composed entirely of CO2, what fraction of IR energy could be absorbed by CO2?

(c) The Earth’s atmosphere is really 380ppm CO2. If the absorption efficiency is proportional to the concentration, how much IR energy could be absorbed by CO2 in this case?

### design suitable bearings to support the load for at least 5E8 cycles at 1 200 rpm using deepgroove ball bearings.

The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in row (a) of Table P11-1, and the corresponding diameter of shaft found in Problem 10-19,….

### Find the minimum film thickness for a long bearing with the following data: 30-mm dia, 130 mm long, 0.0015 clearance ratio, 1 500 rpm, ISO VG 100 oil at 200°F, and supporting a load of 7 kN.

1.       A paper machine processes rolls of paper having a density of 984 kg/m3. The paper roll is 1.50-m OD X 22-cm ID X 3.23-m long and is on a simply supported, 22-cm OD, steel….

### Find the minimum film thickness for a bearing with these data: 30-mm dia, 25 mm long, 0.0015 clearance ratio, 1 500 rpm, ON = 30, ISO VG 220 oil at 200°F.

1.       Problem 7-12 estimated the volume of adhesive wear to expect from a steel shaft of 40 mm dia rotating at 250 rpm for 10 years in a plain bronze….