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Determine the diffusion time required at 600oC. The pre-exponential and activation energy for diffusion of nitrogen in steel is given as 3X10-7m2/s and 76.15 kJ/mol, respectively.
A hollow shaft has an outsaid diameter of 35 mm and an insaid diameter of 25 mm complute the torsional shear stress in the shaft when it is subjected to a torque of 560 N.m.
There are straight rectangular fins on the right hand side of the wallwith thermal conductivity 250 W/mK. What is the max temp that will occur in the wall?
Draw a schematic of the system , determine the exergy destruction rate (kW). Is there any practical way to reduce the exergy destruction for this process?
If the furnace is at 1200 °C and the surrounding room is at 30 °C, determine the rate of exergy destruction (kW) through the window?
Determine (a) the actual work (kJ) and (b) the minimum work (kJ) of the process. (c) Draw one T-s diagram of the two processes.
Compute the estimated endurance strength for a 20.0mm-diameter rod machined from AISI 5160 OQT 1300 steel and subjected to reversed and repeated bending stress. use reliability of 99%.
Compute the required diameter for a solid circular shaft if it is transmitting a maximum of 110hp at a speed of 560 rpm. the torque varies from zero to the maximum.
The valve is opened, and the two tanks eventually come to a uniform state. Assuming the process to be adiabatic, what is the final pressure?
Compute the stress in the bar and the resulting design factor if it is made from (a) AISI 120 hot-rolled steel (b) AISI 8650 OQT 1000 steel, (c) ductile iron A536-84 (60-40-18).
A tool with a weight of 500lb moves continuously from the end of the 60in beam to a point 10in from the support. Specify a suitable design for the boom, giving the material, the cross-sectional shap
Determine a) the work of the adiabatic process and b) the stored energy of the gas at each of the other two states if its stored energy in the initial state is assigned the value of zero.
A heat engine accepts 700 kJ of heat from a thermal source and rejects 250 kJ of that heat to a thermal sink. What is the work output of the heat engine? What is its thermal efficiency?
An ideal gas is heated from 50 C to 80 C, (a) at constant volume and (b) at constant pressure. For which case do you think the energy required will be greater? Why?
When he returns in the evening, will his room be warmer or cooler than the neighboring rooms? Why? Assume all the doors and windows are kept closed.
Knowing that block B has a constant velosity of 3 in/s upward, determine (a) the time when the velocity of block A is zero, (b) the time when the velocity of block A is equal to the velocity of bloc
With a safety factor of 4, what axial compressive load can be applied if a) Both ends are hinged? b) One end is built in and the other is unsupported?
The filter passes all wavelengths between 600 and 1000 nm without attenuation, while rejecting all other radiation. The sun's light is modeled as that of a blackbody. What is the theoretical efficie
At noon, a vertical pole casts a shadow that is 1.5 times longer than its height. a) What is the date? b) What is the local latitude? c) Can you be 100% certain of this date/location? Why or why not
At exit, p2 - 14.7 psia, v2 = 26.77 ft^3/lb, and u2 = 1077.5 Btu/lb. Calculate exit velocity in (ft/sec) Show energy term calculations clearly.
A short squared timber post supports a load of 115,000 pounds. If the allowable unit compressive stress is 1,000 psi, what is the cross section size of this timber post support?
What time will be required at 500°C to produce the same resul (in terms of concentration at a specific depth) as for 10-hours at 600°C?
Assume the roughness wavelength is 10m, and its amplitude is 20cm. At what speed does the maximum amplitude of vibration occur, and what is the corresponding vibration amplitde.
Determine the following: a) The gas pressure (lbf/in^2) when the piston will just lift off the bottom stops b) the work (ft.lbf) for the process.
Determine the new perigee and apogee altitudes of the satellite if an on-board maneuvering engine Increases the orbital speed of the satellite by 800 ft/s.