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A freezer compartment is covered with a 2-mm-thick layer of frost at the time it malfunctions. If the compartment is in ambient air at 20°C and a coefficient of h = 2 W/m2 · K characterizes heat transfer by natural convection from the exposed surface of the layer, esti- mate the time required to completely melt the frost. The frost may be assumed to have a mass density of 700 kg/m3 and a latent heat of fusion of 334 kJ/kg.
a power plant based on the rankine cycle is under development to provide a net power output of 10 mw. solar collectors
when the rubber bands of the sling shot are pulled back each rubber band is stretched 3 in. the natural length and the
A turbine receives 10 kg/s of steam at a state of p1 = 5 bar, t1 = 400?c and exhausts to a pressure of p2 = 1.5 bar. The ambient temperature is t0 = 300c and the ambient pressure is p0 = 1 bar. What is the rate of work if isentropic efficiency is 75%..
Determine the power generated by the motor M at this instant if it operates with an efficiency of epsilon = 0.8.
The steady state operation for a simple steam power plant with a mass flow rate of 1 kg/s is shown in the figure. Determine 1) the thermal efficiency of the process and 2) mass flow rate of cooling water in kg/s (assume condenser is well insulated)
Specify the crucial resources that you would need as a project manager to run the existing business interests at the same time that the business changes to the production of touring class motorcycles.
You have a 120 Ω quarter bridge 2 wire set up with Sg=2.10 and an unknown lead wire resistance. A 59880Ω calibration resistor is switched in parallel to the gage only and a recording instrument is set to give a -100 mm deflection for this calibrat..
water vapor at 6 mpa 600degc enters a turbine operating at steady state and expands to 10 kpa. the mass flow rate is 2
a fluid has a viscosity of x nsm2 and is placed in a concentric cylinder viscometer. the gap width is g mm and the
in a hydroelectric power plant water enters the turbine nozzles at 880 kpa absolute with a negligible velocity. if the
A small droplet of liquid detergent, falling through air in a spray drying tower, has its diameter reduced as water evaporates from the surface. If we assume that the temperature of the liquid within the drop remains at 290 K and the dry air is at..
Develop an expression for the average convection coefficient, hturb(x), as a function of distance from the leading edge, x, for the turbulent region, xc x L.
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