Two students are talking in the corridor you can hear them in your class but you cannot see them why?
1 answer:
You can hear two students talking in the corridor first, then see them due to the speed of sound.
The speed of sound is the distance that sound energy will propagate per unit of time through a medium. At room temperature, the speed of sound in air is about 1125 ft/s (343 m/s).
The speed of sound varies from substance to substance in function of the material density, elasticity and temperature. Typically sound travels most slowly in gases (like air 343 m/s), faster in liquids (like water 1481 m/s) and fastest in solids (like iron 5120 m/s).
<h3>What is velocity?</h3>It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
Learn more about velocity at: brainly.com/question/3004254
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The work done by a gas during an isothermal process is given by:
(1)
where
n is the number of moles of the gas
R is the gas constant
T is the absolute temperature of the gas
is the ratio between the final volume and the initial volume of the gas
We need to calculate this ratio, and we can do it by using the gas pressure. In fact, for an isothermal process, Boyle's law states that the product between pressure and volume of the gas is constant:
which can be rewritten as
which is equivalent to
The problem says that the pressure of the gas is tripled, therefore the ratio between final and initial volume is:
Now we can use eq.(1) to calculate the work done by the gas. The absolute temperature is
The number of moles is n=2, therefore the work done is
And the work is negative, because it is done by the environment on the gas (the gas is compressed)
where
n is the number of moles of the gas
R is the gas constant
T is the absolute temperature of the gas
We need to calculate this ratio, and we can do it by using the gas pressure. In fact, for an isothermal process, Boyle's law states that the product between pressure and volume of the gas is constant:
which can be rewritten as
which is equivalent to
The problem says that the pressure of the gas is tripled, therefore the ratio between final and initial volume is:
Now we can use eq.(1) to calculate the work done by the gas. The absolute temperature is
The number of moles is n=2, therefore the work done is
And the work is negative, because it is done by the environment on the gas (the gas is compressed)