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Green Computing Each year, graphic designers, entrepreneurs, and engineers gather at the Greener Gadgets conference. Experts partner with professionals who administer Core77, a Web site with resources for graphic designers, to hold a Greener Gadgets Design Competition. Visit the Core77 Web site (core77.com) and then view the past year's winning entries. How were computers used to generate the products' designs? What technical requirements must be met, and how must the three images tell the story of the design? Then, visit the Greener Gadgets Web site (greenergadgets.com) and read the News, Blog, and Press sections. Which gadgets present green technological alternatives to the toxic chemicals, heavy metals, and low recycling rates of today's products?
A block of metal has a 90 notch cut from its lower surface. The notched part rests on a circular cylinder of diameter 2.0 cm, as shown in Fig. 4.15. If the lower surface of the par is 1.3 cm above the base plane, how deep is the notch?
R-134 enters the condenser of a window air conditioning unit at 800 kPa and 35 C and leaves as a saturated liquid at the same pressure. The compressor current draw is measured to be 5 amps at 240 V and the R-134 has a mass flow rate of 0.018 kg/s. If..
Estimate the heat transfer coefficient, h, associated with Points A, B, C, D, and E in Figure 10.4. Which point is associated with the largest value of h? Which point cor- responds to the smallest value of h? Determine the thickness of the vapor bla..
The element of volume delta V of the right circular cone of altitude h and base radius r is formed by slicing the cone at a distance x from the vertex. if the slice is finite thickness delta x, show that its delta v is [pi*r^2/h^2][x^2*deltax+x(delta..
a two-dimensional flow field is described by v-4yi-4xj. find a functional expression of the streamlines and sketch
Determine the reverse thrust applied by the engine to the airplane. Assume the inlet and exit pressures are atmospheric and that the mass flowrate of fuel is negligible compared to the air flowrate through the engine.
consider an air-standard otto cycle and a modified cycle in which the isentropic compression and expansion processes
If you could go back in time and be part of any engineering achievement in the past, what would you choose? Discuss the actual development of the item in question. Include issues such as why the item was desired, what problems the designers confron..
A piston-cylinder contains 50 L of saturated liquid R-134a. The piston is frictionless, and has a mass and area resulting in an applied pressure of 500 kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 70 °C. Calcul..
As fresh poured concrete hardens, the chemical transformation releases energy at a rate of 2 W/kg. Assume the center of a poured layer does not have any heat loss and that it has an average heat capacity of 0.9 kJ/kg K. Find the temperature rise d..
the itaipu hydroelectric power plant has a rated generation capacity of 14000 mwe. there are 20 turbine-generators to
By taking the cross product of this equation with a?, find the time variation of |a|. Deduce that the angle between ω and a decreases with time if C > A (which it is for a normal frisbee).
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