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Levitation by laser light A 1-kW light beam from a laser is used to levitate a solid aluminum sphere by focusing it on the sphere from below. What is the diameter of the sphere, assuming that it floats freely in the light beam? The density of aluminum is 2.7 g/cm3. Light beam
Manganese has a density of 7.44 g/cm^3. Given that the activation energy for vacancy formation is 1.1 eV/atom, calculate the number of vacancies per cubic meter of Manganese at 1200 degrees C. The atomic weight of manganese is 54.94 amu.
a steel radiant tube that is 8 inches in diameter and 8 feet long is placed inside of a convective oven. an electric
Consider an ideal air-standard Otto cycle starting at 9 psia, 42 deg F, with a compression ratio of 12, and a specific heat addition of 240 Btu/lbm. Calculate the thermal efficiency, peak temperature, specific work output, and the temperature at the ..
the reynolds number re is a dimensionless number used in fluid mechanics and is defined as repvdu where p is the fluid
a piston-cylinder device has nitrogen gas at 160 kpa and 158oc. the 23-cm diameter piston initially pushes against a
a storage tank for natural ng has a top dome that can move up or down as gas is added or subtracted from the tank
a continuous beam abc is fully restrained at point a and restrained at point c in all senses except that it may move in
determine the maximum bending stress developed in the bar if it is subjected to the moments shown. the bar has a
a vehicle starts from rest then moves rectilinear with a velocity of v 2t2 for 5 s until it reaches a velocity of 50
a constant-volume tank contains 10 lbm of ammonia initially at 30 lbfin2 and 80degf 539.67degr. the ammonia is then
A vertical jet of water leaves a nozzle at a velocity of 10 m/s and a diameter of 20 mm. It suspends a plate having a mass of 1.5 kg as indicated in Fig. What is the vertical distance h?
atmospheric air at 90o f and 60 relative humidity flows over a cooling coil at an inlet volumetric flow rate of 2000
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