HW-Ch18 - HW-CH18 9th Edition CH18 Problems: 15, 44, 63, 69...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: HW-CH18 9th Edition CH18 Problems: 15, 44, 63, 69 8th Edition CH18 Problems: 17, 46, 61, 95 15. A steel rod is 3.00 cm in diameter at 25.00 o C. A brass ring has an interior diameter of 2.992 cm at 25.00 o C. At what common temperature will the ring just slide onto the rod? 44. A thermodynamic system is taken from state A to state B to state C, and then back to A, as shown in the p-V diagram of Fig.18-39a. The 69. Figure 18-57 displays a closed cycle for a gas. The change in internal energy along path ca is vertical scale is set by ps = 40 Pa, and the hori160J. The energy transferred to the gas as heat is zontal scale is set by Vs = 4.0 m3 . (a)-(g) Com200J along path ab, and 40J along path bc. How plete the table in Fig. 18-39b by inserting a plus much work is done by the gas along (a) path abc sign, a minus sign, or a zero in each indicated and (b) path ab? cell. (h) What is the net work done by the system as it moves once through the cycle ABCA? 63. Figure 18-47 shows (in cross section) a wall consisting of four layers, with thermal conductivities k1 = 0:060W=m K, k3 = 0:040W=m K, and k4 = 0:120W=m K (k2 is unknown). The layer thicknesses are L1 = 1.5 cm, L3 = 2.8 cm, and L4 = 3.5 cm (L2 is unknown). The known temperatures are T1 = 30 o C, T12 = 25 o C, and T4 = -10o C. Energy transfer through the wall is steady. What is interface temperature T34 ? 1 ...
View Full Document

This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.

Ask a homework question - tutors are online