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1. Consider the transmission case of Problem 1.23, but now allow for radiation exchange with the ground/ chassis, which may be approximated as large surround- ings at Tsur = 30°C. If the emissivity of the case is s = 0.80, what is the surface temperature?
2. One method for growing thin silicon sheets for photo- voltaic solar panels is to pass two thin strings of high melting temperature material upward through a bath of molten silicon. The silicon solidifies on the strings near the surface of the molten pool, and the solid silicon sheet is pulled slowly upward out of the pool. The silicon is replenished by supplying the molten pool with solid sili- con powder. Consider a silicon sheet that is Wsi = 85 mm
(a) Determine the electric power, Pelec, needed to oper- ate the system at steady state.
(b) If the photovoltaic panel absorbs a time-averaged solar flux of q"sol = 180 W/m2 and the panel has a conversion efficiency (the ratio of solar power absorbed to electric power produced) of 77 = 0.20, how long must the solar panel be operated to pro- duce enough electric energy to offset the electric energy that was consumed in its manufacture?
a four-cylinder four-stroke internal combustion engine has a bore of 6.5 cm and a stroke of 5.3 cm. the clearance
Do this by assuming uniaxial tension along [110] and expressing σ 1, σ 2,.. .,τ 12 in terms of σ [110]. Then use the matrix of elastic constants to ?nd e1, e2, . . .,γ 12, and ?nally resolve these strains onto the [110] axis to ?nd e[110].
chemical civil and mechanical engineers must often determine the power required to pump a fluid through a series of
An input 422 ft-lb of torque from the torque converter.
hyaluronic acid is a viscoelastic gel and offers lubrication in the knee joints under stress. the lubrication property
A “friend” asks you to construct the phase diagram for a new binary alloy of A and B. The clues are: (i) A and B are completely immiscible in each other and no solid solutions exist in the diagram, (ii) no stoichiometric compounds exist in the diagra..
consider an alcohol and a mercury thermometer that read exactly 0 c at the ice point and 100 c at the steam point. the
Water flows at a rate of 20 l/s through a horz pipe dia .03 m. The pressure drop across the valve in the pipe is measured to be 2 kPa. Determine the irreversible head loss of the valve, and the useful pumping power needed to overcome the resulting..
consider a spark ignition combustion engine with two possible configurartion for turbocharging. configuration a is
a 200mm long 10mm dia. tensile sample experienced plastic deformation at a strain of 0.01. the applied load was 78.5
the temperature in a vessel is 36 degree c and the proportion by mass of air to dry saturated steam is 0.1. what is the
an engineer measures the diameter of 20 tubes selected at random from a large shipment. the sample yields a sample mean
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