308 >TRENGT1I OF MATKK1ALS 



115. d = 4.4<i5 in. 116. d = 3.084 in. 



117. Internal diameter = 6.63 in. ; solid : hollow = 8 : 1. 



118. 4484. 119. p e = 23,600 Ib./inA 



120. If weight of shaft is neglected, q = 139 lb./in. 2 , H = 2}. 



121. d = 7.114 in. 122. = 32 28'. 



124. Angle of twist per unit of length is BI = 1' 33.8". 125. 0j = 0' - 



126. v max = 22,240 lb./in.-, D = C.36 in., W = .158.0<>5 in. Ib. 



127. 2040 lb./in. 2 . 128. 375 lb./in. 2 , assuming 10 for the factor of sa 

 129. Bottom .13 in. ; bid.- . :i in. 130. <5528 lb./in. 2 . 



131. \ in. 132. r,86 lb./in. 2 . 133 



134. .j in. 135. .13in. 136. 1 1 .4::n lb./in. 2 . 



137. 15,880 ft. 138. 139. 12.187 lb./in. 2 



140. 1.2 in. 141. 2344 lb./in. 2 . 143. 130 Ib./; 



144. .28 in. 145. 11.781b. 



146. AKsuinin.i; E> : K, 15 : 1, / ' = 2360 in. 4 , * = 2.206 in., p - 460 Ib./i 



151. /*, = 3082 lb./in. 2 , factor of safet\ 



153. p mmx = 1!2.; lb./in. 2 . 154. d = .0003 in.. M 2. 11 .",25 in. Ib. 



163. = 300 tons, by (104); /; BSTtOM, 165. 101 in. 



167. W. yiau.h 4042 lb./ft., Rankine4110 Ib./ft. 168 ft. 



169. 13,800 lb./ft. 174. 2250 lb./in. 2 , 3001 Ib./i 



176. 4701b./ii, 177. 460 Ib./i 



178. Ac = 6.03 in., Af = 236,724 in. Ib. 179. p. = 66,440 lb./in. 2 . 



180. hv = 6.08 in., M= 191,867 in. Ib. 181. 6260 Ib., 4263 Ib. 



182. For this case equation (ill) becomes |p r o = rp 4 , and equation (114) b 



If = fctftf, p r t + rp.(n - )], whence r = .0092. 



184. <<o u 'lb./in. 2 ; -, W72 lb./in. 2 ; (n 



lb./in. 2 , 6638 Ib./i 186. 752 lb./in.. 





