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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?
A small scale hydraulic power system has an elevation difference between the reservoir water surface and pond surface temperature downstream of turbine is 10m. The flow rate through the turbine is 1m^3/s. The turbine efficiency is 83%. Determine t..
Four kg of water at 100°C fill a closed container having a volume of 1 m3. If the water at this state is a vapor, determine the pressure, in bar. If the water is a two-phase liquid-vapor mixture, determine the quality.
a motor car shaft consist of a steel tube 30 mm internal diameter and 4 mm thick .thee engine develops 10kw at
determine the velocity of its center when it reaches the end of the bowling lane.The ball is always in contact with the bowling lane during its motion. the bowling ball may be assumed to be a uniform solid sphere with a mass of 7 kg and diameter o..
a composite rod consists of two different materials a and b each of length 0.5 l. the thermal conductivity of material
why is the carnot cycle not suitable as an ideal cycle for all the power producing devices ?
the horizontal roof of a building is coated with black tar. the roof is well-insulateed underneath while the upper
in an air compressor the pressure at inlet and outlet are 1bar and 5bar respectively. the temperature of the air at
Prove that the transformation Q1 = q12 Q2 = q2 sec p2 p cos p2 - 2q2 P= 1 P2 = sin p2 - 2q1 1 2q1 cos p2 is canonical, by any method you choose . Find a suitable generating function that will lead to this transformation.
contrary to what you might expect a solid steel ball can float on water due to the surface tension effect. determine
one-half pound of water executes a carnot power cycle. during the isothermal expansion the water is heated at 600
SAE-30 oil at 80-C occupies the space between two cylinders, 2 and 2.2 cm in diameter. The outer cylinder is stationary and the inner cylinder rotates at 100 rpm. Is the oil in a laminar or turbulent state if Recrit ¼ 1700? Use Re ¼ or1d=n, where ..
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