Physics, 20.11.2019 22:31 yuki430p7szcq
One of the most important microscopic properties of gas molecules is velocity. there are several different ways to describe statistically the average velocity of a molecule in a gas. the most obvious measure is the average velocity vavg. however, since the molecules in a gas are moving in random directions, the average velocity is approximately zero. another measure of velocity is (v2)avg, the average squared velocity. since the square of velocity is always positive, this measure does not average to zero over the entire gas. a third measure is the root-mean-square (rms) speed, vrms, equal to the square root of (v2)avg. the rms speed is a good approximation of the typical speed of the molecules in a gas. a. what is the average speed vavg the molecules in the gas? b. because the kinetic energy of a single molecule is related to its velocity squared, the best measure of the kinetic energy of the entire gas is obtained by computing the mean squared velocity, v^2avg, or its square root vrms. the quantity vrms is more common than v^2avg because it has the dimensions of velocity instead of the less-familiar velocity-squared. what is the rms speed vrms of the molecules in the nitrogen gas? c. what is the temperature t of the sample of n2 gas described in the histogram?
Answers: 1
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In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?
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Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide? kg • what must the total momentum of the system be after the train cars collide? kg •
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Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.
Answers: 3
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