Physics, 21.09.2019 04:30 natalie2sheffield
If a transmission line in a cold climate collects ice, the increased diameter tends to cause vortex formation in a passing wind. the air pressure variations in the vortexes tend to cause the line to oscillate (gallop), especially if the frequency of the variations matches a resonant frequency of the line. in long lines, the resonant frequencies are so close that almost any wind speed can set up a resonant mode vigorous enough to pull down support towers or cause the line to short out with an adjacent line. if a transmission line has a length of 347 m, a linear density of 4.35 kg/m, and a tension of 65.4 mn, what are (a) the frequency of the fundamental mode and (b) the frequency difference between successive modes
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Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?
Answers: 3
If a transmission line in a cold climate collects ice, the increased diameter tends to cause vortex...
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