a) What is the percentage increase in temperature between 0°C and 26°C when the temperatures are measured in Kelvin? What is the difference between these two temperatures when measured in Kelvin? The outlet of a rocket engine has a cylindrical shape. Its diameter is 2.5m when constructed in the factory at 18°C. Given a = 6 x 10-6K-1 for the alloy used, what will its diameter be (in metres) at its operating temperature of 600°C ? d) What will the cross-sectional area of the outlet be (in m²) at this temperature?

Temperatures in Biomedicine. (a) Normal body temperature. The average normal body temperature measured in the mouth is 310 K. What would Celsius and Fahrenheit thermometers read for this temperature? (b) Elevated body temperature. During very vigorous exercise, the body’s temperature can go as high as 40OC. What would Kelvin and Fahrenheit thermometers read for this temperature? (c) Temperature difference in the body. The surface temperature of the body is normally about 7CO lower than the internal temperature. Express this temperature difference in kelvins and in Fahrenheit degrees. (d) Blood storage. Blood stored at 4.0OC lasts safely for about 3 weeks, whereas blood stored at -160OC lasts for 5 years. Express both temperatures on the Fahrenheit and Kelvin scales. (e) Heat stroke. If the body’s temperature is above 105OF for a prolonged period, heat stroke can result. Express this temperature on the Celsius and Kelvin scales.

(a) Define a new temperature scale, say °N in which the boiling and freezing points of water are 1000°N and 100°N, respectively, and correlate this scale with the Fahrenheit and Celsius scales. (b) The °N reading on this scale is a certain number of t degrees on a corresponding absolute temperature scale. What is this absolute temperature at 0°N?  Ans. (a)lN = 9te + 100. (b) 2360°N abs, approx.