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The voltage in an EBW operation is 45 kV. The beam current is 60 milliamp. The electron beam is focused on a circular area that is 0.25 mm in diameter. The heat transfer factor is 0.87. Calculate the average power density in the area in watt/ mm2 .
A 2.4-N force is applied to the plunger of a hypodermic needle. If the diameter of the plunger is 1.3 cm and that of the needle 0.20 mm,
At steady state, air at 200 kPa, 528C and a mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. At the duct exit, the pressure of the air is 100 kPa, the velocity is 255 m/s, and the cross-sec..
a 50kg uniform box is held on an inclined surface by a horizontal rope which passes around a pulley. the coefficient of
consider an aorta that has a circular cross section with a diameter of 5mm and a length of 10cm. assume that the
It is claimed that a refrigerator requiring 400 W of power (W) receives heat from cold storage (low temperature source, TL) at 200 K and rejects heat at the rate of 600 W (QH) to an environment at 600 K (high temperature reservoir, TH). Calculate the..
a bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature assumed 20
in a tensile test for an alloy used for ballistic-missile launch tubes on boomer submarines the yield strength was
Determine the cutting force F applied by the blade DE to the bar at G in terms of the force P applied to the handle of the heavy-duty cutter. Assume that the cutting force F is perpendicular to the lower edge of the blade DE.
Steam at 140 lbf/in.2, 1000°F enters an insulated turbine operating at steady state with a mass flow rate of 3.24 lb/s and exits at 2 lbf/in.2 Kinetic and potential energy effects are negligible. Determine the maximum theoretical power that can b..
a thermoelectric generator consists of a series of semiconductor elements heated on one side and cooled on the other.
a dish of liquid water is placed on a table in a room. after a while all of the water evaporates. taking the water and
We're asked to determine the deflection of a beam location for a 2000N load. However the force is directed up the corner NOT centroid.
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