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| <h2>Solutions of Savchenko Physics Textbook</h2> |
| <h2>Solutions of Savchenko Physics Textbook</h2> |
| <p class="author"> |
| <p class="author"> |
| Aliaksandr Melnichenka <br/> |
| Aliaksandr Melnichenka <br/> |
| October 2023 |
| October 2023 |
| </p> |
| </p> |
| </header> |
| </header> |
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| <main> |
| <h3 id="back-link"><a href="../">$\leftarrow$Back</a></h3> |
| <article> |
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| <h3 id="back-link"><a href="../">$\leftarrow$Back</a></h3> |
| <h3> Statement </h3> |
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| <h4>Statement</h4> |
| <p> |
| <p> |
| $5.6.22^*$ |
| $5.6.22^*$ |
| In a rarefied space, a cylindrical container remains vertically, covered at the top by a movable piston of mass $M$. Inside the closed volume, there is a monoatomic gas at temperature $T$ and pressure $P$. The interior cross-section of the cylinder is $S$, the height of volume where gas lies is $H$. The piston is set free and is moved. What maximum speed will develope the piston, if gas is compressed by the piston a) isothermally and b) adiabatically? The acceleration due to gravity is $g$. |
| In a rarefied space, a cylindrical container remains vertically, covered at the top by a movable piston of mass $M$. Inside the closed volume, there is a monoatomic gas at temperature $T$ and pressure $P$. The interior cross-section of the cylinder is $S$, the height of volume where gas lies is $H$. The piston is set free and is moved. What maximum speed will develope the piston, if gas is compressed by the piston a) isothermally and b) adiabatically? The acceleration due to gravity is $g$. |
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| </p> |
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| <center> |
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| <figure> |
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| <img src="statement.png" |
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| loading="lazy" alt="1.1.1" width="150" /> |
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| <figcaption> |
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| For the 5.6.22 problem |
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| </figcaption> |
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| </figure> |
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| </center> |
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| <h4>Solution</h4> |
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| <p class="TxtSolutions"> |
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| a) From Energy Conservation Law or Kinetic Energy - Work theorem |
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| </p> |
| </p> |
| <center> |
| <center> |
| $\frac{Mv^2}{2} = Mg(H-y) + A \;(1)$ |
| <figure> |
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| <img src="statement.png" |
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| loading="lazy" alt="1.1.1" width="150" /> |
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| <figcaption> |
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| For the 5.6.22 problem |
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| </figcaption> |
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| </figure> |
| </center> |
| </center> |
| <p class="TxtSolutions"> |
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| <h3>Solution</h3> |
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| <p> |
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| a) From Energy Conservation Law or Kinetic Energy - Work theorem |
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| $$\frac{Mv^2}{2} = Mg(H-y) + A \;(1)$$ |
| where $A$ is the work done over the piston, equals to work done by gas, in this case (isothermal process) defined by |
| where $A$ is the work done over the piston, equals to work done by gas, in this case (isothermal process) defined by |
| </p> |
| $$A = nRT\ln{\frac{Sy}{SH}} = -nRT\ln{\frac{H}{y}} \;(2)$$ |
| <center> |
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| $A = nRT\ln{\frac{Sy}{SH}} = -nRT\ln{\frac{H}{y}} \;(2)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Substituting $(2)$ into $(1)$ |
| Substituting $(2)$ into $(1)$ |
| </p> |
| $$\frac{Mv^2}{2} = Mg(H-y) - nRT\ln{\frac{H}{y}} \;(3)$$ |
| <center> |
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| $\frac{Mv^2}{2} = Mg(H-y) - nRT\ln{\frac{H}{y}} \;(3)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| From Boyle-Mariotte Law |
| From Boyle-Mariotte Law |
| </p> |
| $$PSH = P'Sy \;(4)$$ |
| <center> |
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| $PSH = P'Sy \;(4)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Applying state equation to initial state, |
| Applying state equation to initial state, |
| </p> |
| $$n = \frac{PSH}{RT} \;(5)$$ |
| <center> |
| $$PSH = nRT$$ |
| $PSH = nRT$ |
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| </center> |
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| <center> |
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| $n = \frac{PSH}{RT} \;(5)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Applying Newton's Second Law |
| Applying Newton's Second Law |
| </p> |
| $$Mg - P(t)S = M\frac{dv}{dt}$$ |
| <center> |
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| $Mg - P(t)S = M\frac{dv}{dt}$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| At the moment of maximum velocity, $dv/dt = 0$ and $P(t) = P'$, hence |
| At the moment of maximum velocity, $dv/dt = 0$ and $P(t) = P'$, hence |
| </p> |
| $$Mg = P'S \;(6)$$ |
| <center> |
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| $Mg = P'S \;(6)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Putting $(6)$ into $(4)$ and separating $y$ |
| Putting $(6)$ into $(4)$ and separating $y$ |
| </p> |
| $$y = \frac{PSH}{Mg} \;(7)$$ |
| <center> |
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| $y = \frac{PSH}{Mg} \;(7)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Substituting $(5)$ and $(7)$ into $(3)$ and separating $v$ |
| Substituting $(5)$ and $(7)$ into $(3)$ and separating $v$ |
| </p> |
| $$\boxed{v = \sqrt{2gH\left(1-\frac{PS}{Mg}+\frac{PS}{Mg}\ln{\frac{PS}{Mg}}\right)}}$$ |
| <center> |
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| $\boxed{v = \sqrt{2gH\left(1-\frac{PS}{Mg}+\frac{PS}{Mg}\ln{\frac{PS}{Mg}}\right)}}$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| b) From Poisson's Law |
| b) From Poisson's Law |
| </p> |
| $$P(SH)^\gamma = P'(Sy)^\gamma \;(8)$$ |
| <center> |
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| $P(SH)^\gamma = P'(Sy)^\gamma \;(8)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| The work done by the gas in an adiabatic process is given by |
| The work done by the gas in an adiabatic process is given by |
| </p> |
| $$A = \frac{PSH-P'Sy}{\gamma-1} \;(9)$$ |
| <center> |
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| $A = \frac{PSH-P'Sy}{\gamma-1} \;(9)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| According to $(6)$, we can modify $(8)$ and separating $y$, obtaining |
| According to $(6)$, we can modify $(8)$ and separating $y$, obtaining |
| </p> |
| $$y = H\left(\frac{PS}{Mg}\right)^\frac{1}{\gamma} \;(10)$$ |
| <center> |
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| $y = H\left(\frac{PS}{Mg}\right)^\frac{1}{\gamma} \;(10)$ |
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| </center> |
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| <p class="TxtSolutions"> |
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| Putting $(9)$ into $(1)$, and taking account $(6)$, |
| Putting $(9)$ into $(1)$, and taking account $(6)$, |
| </p> |
| <div class="scroll-wrapper"> |
| <center> |
| $$\frac{Mv^2}{2} = H\left(Mg+\frac{PS}{\gamma-1}\right)-Mgy\left(1+\frac{1}{\gamma-1}\right) \;(11)$$ |
| $\frac{Mv^2}{2} = H\left(Mg+\frac{PS}{\gamma-1}\right)-Mgy\left(1+\frac{1}{\gamma-1}\right) \;(11)$ |
| </div> |
| </center> |
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| <p class="TxtSolutions"> |
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| Substituting $(10)$ into $(11)$, since gas is monoatomic ($i = 3$ and $\gamma = 5/3$), and separating $v$ |
| Substituting $(10)$ into $(11)$, since gas is monoatomic ($i = 3$ and $\gamma = 5/3$), and separating $v$ |
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| $$\boxed{v = \sqrt{2gH\left[1-\frac{5}{2}\left(\frac{PS}{Mg}\right)^\frac{3}{5}+\frac{3}{2}\frac{PS}{Mg}\right]}}$$ |
| </p> |
| </p> |
| <center> |
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| $\boxed{v = \sqrt{2gH\left[1-\frac{5}{2}\left(\frac{PS}{Mg}\right)^\frac{3}{5}+\frac{3}{2}\frac{PS}{Mg}\right]}}$ |
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| </center> |
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| <p class="TxtSolutions" style="text-align: right; font-style: italic; font-size: 14;"> |
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| BSc. Luis Daniel Fernández Quintana<br> |
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| Physics Department (FCNE)<br> |
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| Universidad de Oriente, Cuba<br> |
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| </p> |
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| </article> |
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