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A desktop computer is to be cooled by a fan. The electronic components of the computer consume 60 W of power under full-load conditions. The computer is to operate in environments at temperatures up to 45 °C and at elevations up to 3400 m where the average atmospheric pressure is 66.63 kPa. The exit temperature of air is not to exceed 60 °C to meet the reliability requirements. Also, the average velocity of air is not to exceed 110 m/min at the exit of the computer case where the fan is installed to keep the noise level down. Determine the flow rate of the fan that needs to be installed and the diameter of the casing of the fan. Assume that there is an increase in internal energy of 10,779 kj/kg.
a truck travelling along a straight road at speed 20 km/hr increases its speed to 120 hr/hr in time 15 sec.If its acceleration is constant, determine the distance traveled.
Finding exit velocity from air nozzle, Air enters a nozzle operating at steady state at 800 ºR with a negligible velocity and exits the nozzle at 570 ºR.
Describe on your own words the three strengthen mechanism for metals (i.e. grain size reduction, solid solution strengthening and strain hardening). Be sure to explain how dislocations are involved in each of the strengthening techniques.
Both cars undergo constant acceleration. Determine the time when the two cars pass each other on the highway.
crates a and b weigh 100 lb and 50 lb respectively. if they start from rest determine the their speed when t 5s. also
A house is maintained at 1 atm and 24 C and warm air inside a house is forced to leave the house at a rate of 150 m^3/h as a result of outdoor air at 5C infiltrating into the house through the cracks. Determine the rate of net energy loss of th..
a smoke stream from a smoke generating tube is often used as a simple method of flow visualization in wind tunnels.
the acceleration of a particle in a fixed coordinate system in terms of its position in a translating and rotating
in an accelerator protons emerge with velocity of 2.5 x 108 ms. the accelerator is 0.8km long.a if the acceleration is
the sun is approximated as a spherical black body with a surface temperature of 5762 k. the irradiation from the sun as
the wheel in fig. 10-27 has eight equally spaced spokes and a radius of 30 cm. it is mounted on a fixed axle and is
question a 49 kg person drinks 520. g of milk which has a caloric value of approximately 3.0 kjg. if only 19 of the
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