2. Compare the torsional rigidities of the following sections a) a hollow tube 30 mm outside diameter and 1.5 mm thick
b) the same tube split along its length with a 1 mm gap
c) an equal leg angle section having the same perimeter and thickness as (b)
d) a square box section with side length 30 mm and 1.5 mm wall thickness
e) a rectangular solid bar, side ratio 2.5 to 1. having the same metal cross-sectional area
as the hollow tube. Compare also the maximum stress es arising in each case.​

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.