Using isothermal jet theory, estimate the length of an ethane–air diffusion fl ame for an initial velocity of 5 cm / s. The velocity profi le issuing from the 10-mm-diameter port is uniform. Both the air and ethane are at 300 K and 1 atm. The viscosity of ethane is approximately 9.5 · 10−6 N-s / m2. Compare your estimate using an average viscosity, ( μair + μethane ) / 2, with the predicted value from Roper’s experimental correlations.

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

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.