17(A) Τ = 120(10 3 )( Π/ 4)(20 2 ) = 382 MPA(B) Σ = 32(800)(800)(10...

1-17

(a) τ = 120(10 3 )

( π/ 4)(20 2 ) = 382 MPa

(b) σ = 32(800)(800)(10 3 )

π (32) 3 (10 3 ) 3 = 198 . 9(10 6 ) N/m 2 = 198 . 9 MPa

(c) Z = π

32(36) (36 4 − 26 4 ) = 3334 mm 3

(d) k = (1 . 6) 4 (79 . 3)(10 3 ) 4 (10 9 )

8(19 . 2) 3 (32)(10 3 ) 3 = 286 . 8 N/m