An open wall consist in succession layer of fire bricks (Kf=1.21j/m²°C) a layer of lagging bricks(Kl=0.08j/m²°C) and a layer of bricks (Kb=0.6m²°C)each layer is 10cm thick, the temperature in the inside of the wall is 872°C ,on the outside 32°C. calculate the following (a)heat lost by conduction every 12 hours if the surface area of the wall is 20 m² (b) temperature in the middle of the layer of lagging bricks (c)overall heat transfer coefficient

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

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.

Burgers vector is generally parallel to the dislocation line. a)-true b)-false