Wo slits separated by a distance of d = 0.155 mm are located at a distance of d = 2.40 m from a screen. the screen is oriented parallel to the plane of the slits. the slits are illuminated by a monochromatic and coherent light source with a wavelength of λ = 538 nm. a wave from each slit propagates to the screen. the interference pattern shows a peak at the center of the screen (m=0) and then alternating minima and maxima.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

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.