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Threshold for pair production by a photon A high energy photon (γ-ray) collides with an electron and produces an electron-positron pair according to the reaction
What is the minimum energy the γ-ray must have for the reaction to occur?
How much would it cost to deliver one kilo Watt-hour? How does this compare with the cost of energy from your local electric utility at $0.10 per kilo Watt-hour?
the outer surface of a spacecraft has an emissivity of 0.8 and an absorptivity of 0.3 for solar radiation. if solar
the concentration of pollutant in a certain river increasin at the rate of 150ppm per hour. in addition the pollution
A car and a high -speed trian at constant speeds. three seconds after the train passes under the highway bridge the car crosses the bridge.
a spherical copper shell of inside radius 5cm and wall thickness 1cm loses heat to the surrounding air which is
a cylindrical tank with its axis horizontal has a diameter of 2.0 m and a length of 4.0 m. the ends if the tank are
a mass of 200 grams of copper whose specific heat is 0.095 is heated to 100deg c and placed in 100 grams of alcohol at
Two fully annealed cylindrical specimens of an alloy are to be hardened by reducing their (always circular) cross-sections in an extrusion process. For one specimen, the initial and post-deformation radii are 15mm and 12 mm, respectively.
A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. Determine the mass flow rate of air through the fan at an elevation on 3400 m, where the air density is 0.7 kg/m3. The diameter of the casing of the fan, if the average velo..
2.2 lb of ammonia in a piston cylinder assembly undergoes two isothermal processes in series. The first process from an initial state where p1=120lbf/in^2 with a quality is 85% to a final state where the ammonia is saturated vapor. D
a model of an airplane is to be tested at 20degc in a wind tunnel. the model is built to 112th scale. in order to match
The energy of the system in terms of θ and θ. The equation of motion in terms of θ and θ using Larange's equations.
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