Một đoạn mạch gồm R1=8 ôm;R2=12 ôm.biết R1 nối tiếp với đoạn mạch gồm R2 song song với R3; R3=1/2 R2 cường độ dòng điện chạy qua
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1)
2)
Explanation:
1)
The average kinetic energy of the molecules of an ideal gas is directly related to the Kelvin temperature of the gas, by the formula
where
KE is the kinetic energy
k is the Boltzmann constant
T is the Kelvin temperature
We can say therefore that the average kinetic energy of the particles is directly proportional to the absolute temperature of the gas; so, we can write:
And therefore
(1)
In this problem, we have:
is the initial kinetic energy of the molecules when the temperature of the gas is
Here we want to find the temperature at which the average kinetic energy of the particles is
So, twice the initial value. Substituting into eq.(1) and solving for T2, we find:
Converting into Celsius degrees,
2)
The root-mean-square (rms) speed of the molecules in a gas is given by the equation
where
k is the Boltzmann constant
T is the Kelvin temperature of the gas
m is the mass of each molecule
Therefore, from the equation we can say that the rms speed is proportional to the square root of the temperature:
So we can write:
(2)
where in this problem:
is the rms speed of the molecules when the temperature is
is the final rms speed of the molecules
Solving eq.(2), we find the temperature at which the rms speed is twice the initial value:
Converting into Celsius degrees,