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a. James Dyson is the designer of one of the best selling types of vacuum cleaner. Find out how the design was triggered, the design methods he used and why the design was considered to be innovative.
b. Together with a group of colleagues brainstorm as many ideas as you can for anti-theft devices for the home.
The roller E and supporting box have a mass m1, and the four uniform links (two on each side) have a combined mass m2 and a length 2b for each. Neglect all friction and find the torque M necessary to raise the roller for a given value of ().
the united states consumes 3749846 thousand megawatt hours each year. assuming all of that energy was dumped to the
A centrifugal compressor has 23 radial vanes and an exit area equal to 0.12 m2, where the radial velocity is 27 m/s, and the tip speed of the impeller is 350 m/s. The total-to-total efficiency is 0.83.
An initially empty, well insulated, rigid tank with a volume of 2 m^3 is fitted with a mixing device. The tank has two inlets and zero outlets. One inlet is water at 1.07 MPa and 630ºC while the other is saturated liquid water. Both enter the tank sl..
consider a solid rod with diameter d and length l subjected to torsion t and moment m at both ends shown in fig. 1.
a molybendenum metal pin is 25 mm long and 2mm in diameter. the air surrounding the pin is 200 degrees c the walls of
A 400 L rigid tank contains 5 kg of air at 25 degrees C. Determine the reading of the pressure gauge if the atmospheric pressure is 97 kPa.
an inventor claims to have developed a refrigeration unit that maintains a cold space at -10degc while operating in a
you are working with a semiconductor a write an expression for the conductivity of this semiconductor if it has an
consider refrigerant r-134a flowing in a smooth horizontal 10-mm-inner-diameter tube of wall thickness 2 mm. the
A pump is employed to deliver liquid water from a pond to a higher elevation. The pump steadily draws water from the pond at a volumetric flow rate of 192 gal/min through a pipe having a 7 in diameter inlet. The exit diameter of the pipe is 2 in. and..
an insulated piston-cylinder device contains 0.05m3 of saturated refrigerant-134a vapor at 0.8mpa pressure. the
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