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A large plastic casting with thermal diffusivity 6.0*10-7 m2/s is removed from its mold at a uniform temperature of 150oC. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temperature to 20oC. Assuming the casting approximates a semi-infinite medium and using a finite-difference method with a space increment of 6mm, estimate the temperature at a distance of 18 mm from the surface after 3 min have elapsed.
suppose that two ergonomists rated 21 different cell phones as to their usability the ergonomist agrees with the
rod bde is partially guided by a roller at d which moves in a vertical track. knowing that the instant shown the
carbon monoxide is initially in a 50 l tank at 210 kpa and 127c.a determine the mass of the gas in kilograms.b if 0.02
3-21m for the flud power automobile lift system of figure 3-35 the air pressure equals 550 kpa gage. if the hydraulic
Calculate the number of vacancies per cubic meter in some metal at 763°C. The energy for vacancy formation is 0.79 eV/atom, while the density and atomic weight for this metal are 4.77 g/cm3 and 88.45 g/mol, respectively.
axial flow coolant pump for one lop pressurized nuclear reactor has 75 m head 6m3s flow rate 1440rpm 800 mm diameter
2 kg of water at 10oc and atmospheric pressure are placed in a pressure cooker and heated until the water boils at
the company you work for makes the casting for the rectangular pan 300 mm long x 200 mm wide x 60 mm deep with a 3 mm
the bar rotates in the horizontal plane about a smooth pin at the origin. the 2 kg sleeve a slides on the smooth bar
Methane is completely burned with 20% excess air, with 30% of the carbon going to CO. What is the partial pressure of the CO in the stack gas if the barometer reads 740 mm Hg, the temperature of the stack gas is 300°F
a 150 scale model is to be used in a towing tank to study the water motion near the bottom of a shallow channel as a
A magnetic pickup is used to detect the shaft speed of a turbocharger. A standard hexagonal nut is used to excite the pickup. If the shaft is turning at 50,000 rpm, how many positive impulses will be counted per second?
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