Awell-insulated box loses heat to the ambient only through a single-pane glass window of area 1 m2 and thickness 0.5 em. the ambient medium is at 10°c, and the external heat transfer coefficient is 10 w/m2 • k. the interior of the box is maintained at 25°c and is well mixed, giving the window an inside surface temperature of 2soc. at $0.15/kw ·h (kilowatt-hour), what is the annual cost of maintaining this system

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.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa