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A cold air chamber is proposed for quenching steel ball bearings of diameter D = 0.2 m and initial temperature Ti = 400°C. Air in the chamber is maintained at - 15°C by a refrigeration system, and the steel bans pass through the chamber on a conveyor belt. Optimum bearing production requires that 70% of the initial thermal energy content of the ban above - 15°C be removed. Radiation effects may be neglected, and the convection heat transfer coefficient within the chamber is 1000 W/m2 · K. Estimate the residence time of the balls within the chamber, and recommends a drive velocity of the conveyor. The following properties may be used for the steel: k = 50 W/m · K, a = 2 X 10-5 m2/s, and c = 450 J/kg · K.
The linear impulse and momentum equation is obtained by integrating the ______ with respect to time. Which parameter is not involved in the linear impulse and momentum equation? The internal impulses acting on a system of particles always. Select th..
a cylinder of an aluminum alloy with a radius of 2.00 cm and a length of 11.00000cm is subjected to a force of 41.0kn.
find the complete initial and final states for the following processes t p v h u s and phase involving simple
warm air is contained in a piston-and-cylinder device oriented horizontally as shown below. the air cools slowly from
At a certain instant, gyrosensors on an airplane report that it is heading 40 degrees west of north, climbing at an angle of 20 degrees, and that its wings are banked at an angle 10 degrees clockwise as looking forward (along the axis of the plane). ..
a bird flies directly into a plate glass window path of bird is perpendicular to plane of window at a location 1.5
in an air standard regenerative gas turbine cyclethe pressure ratio is 5.air enters the compressor at 1 bar 300 k and
0.75 kg of Refrigerant 134-a is compressed in a compressor from 160 kPa and -10°C to 1.2 Mpa and 50°C, steadily. Determine the change in flow exergy of the refrigerant during this process, if the environment is at 100 kPa and 25°C.
air flows at a rate of 0.01 kgs through an adiabatic compressor. the gas enters at 100 kpa and 20oc. if the minimum
The 0.6-kg mass is supported by two arms of negligible mass. The angle ? of the arms can be varied by changing the force F acting on the slid- ing collar. When ? = 70?, the assembly is rotating freely about the vertical axis with the angular velocity..
a gas may be considered rare?ed that is it can not be studied with theories based on the continuum assumption if it
How do you determine the velocity of molten metal flowing through the base of the downsprue?
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