The dc gain and characteristic root locations are given for three different stable second-order lti systems. in each case derive the corresponding transfer function and determine the time to reach steady state. a. r1 = −2.5, r2 = −0.2, dc gain=0.5 b. r1 =−3,r2 =−10,dcgain=6 c. r1,2 = −2 ± j4, dc gain=125 d. r1,2 = −0.4 ± j1.6, dc gain = 0.02

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?