A60 w bulb has a cylindrical tungsten filament 4.3 cm in length with an emissivity of 0.47. assuming that conduction and convection losses and re-radiation from the surroundings are all negligible, find the diameter of the filament if it's operating temperature is 1750 °c. assume this temperature to be uniform at all points in the filament at any given time. use 5.67 x 10 w m² k4 for the stefan-boltzmann constant. a) 2.4 mm b) 0.995 mm c) 23.1 mm d) 1.778 mm e) 0.467 mm

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

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

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.