Question

Summarize the problem indicating the question to be answered, list the equations used, show all math with physical units, and indicate your answer with correct sig. figs. Aluminum rivets used in airplane construction are made slightly larger than the rivet holes and cooled by "dry ice" solid CO2 before being driven. If the diameter of a hole is 4.500 mm, what should be the diameter of a rivet at 23.0°C if its diameter is to equal that of the hole when the rivet is cooled to-78.0°C, the temperature of dry ice? Assume that the expansion coefficient remains constant at the value given in Table 12.3. Suggested Questions & Problems for Final Exam: Test 1 Test 2 TABLE 12.3 Coefficients of linear and (12.23) volume thermal expansion at 20°C Volume Linear B (K-) a (K1) Substance uations 12.22 both AT and 27 X 10 Glass 9 X 10 36 x 10 12x 10 Iron or steel 36 x 10 Concrete 12 x 10 s. The volume nge shape, we of a and B are always a small 69 x 10 Aluminum 23 x 10 210 x 10 Water 1100 X 10 Ethyl alcohol 3400 X 10 Air (and other gases) ximate expres- 11

Answer 1

we have xAT do Ad- do DT d-dod, ex OT d dole T AT) -. do 1+ AT AAL= 23xlo'c (u.sor3m) . do 123 -48-922) 1.51 0422Xlo- m 4.S1 m