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Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. Consider a 0.25-m-thick concrete wall ( 2300 kg/m3, c 880 J/kg K, k 1.4 W/m K), which is at an initial temperature of Ti 25 C and irradiated at one surface by lamps that provide a uniform heat flux of q"s = 104 W/m2. The absorptivity of the surface to the irradiation is s 1.0. If building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325 C and 25 C, respectively, after 30 min of heating, will the requirements be met?
A connection of rod of 50 mm diameter has a rectangular block 50 mm wide and 25mm thick forged at its end. A turned radius of 25 mm joins the rod and the block. Draw the projections of the rod showing curves of intersection.
Consider a 4-in square steel bar subjected to transverse biaxial tensile stresses of 20 ksi in the x direction and 10 ksi in the y direction.
an empty parallel plate capacitor is connected between the terminals of a 3.1-v battery and charged up. the capacitor
What methods are used to achieve low levels of corrosion by oxygen in boiler feed water? What measurements are essential to ensure that this is done satisfactorily, and what types of measurement could be used?
No heat interactions with the environment are allowed. You do not need to describe the details of the process that produces the maximum work, but you do need to describe the final state of the blocks fully.
the open water tank is resting on a frictionless plane. the capped orifice on the side has a 4-cm diameter exit pipe
a rigid tank is filled with refrigerant r-134a at 310 k. an electric current of 0.2 amps over 220 volts is passed
a 1700 kg car starts from rest at position a and accelerates uniformly up the incline reaching a speed of 100 kmh at
Diffusion Coeffiecient, Calculate Constant, The diffusion coeffiecient for Cr^+3 in Cr2O3 is 6x10^-15 cm2/s at 727 degrees Celcius and is 1x10^-9 cm2/s at 1400 degrees Celcius.
initially 1.361 kg of steam is contained in a piston-cylinder device at 260 oc with a quality of 0.7. determine the
A body having a mass of 46 kg rests on a horizontal planse for which the coefficiant of friction f = 0.4. A force P acts ofn the body at an angle of 20 degrees with the horizontal. Find its magnitude for impending motion.
a wellinsulated counterflow heat exehanger operates at steady state. in one stream liquid water enters at 10 degree
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