EBK PHYSICS FOR SCIENTISTS AND ENGINEER
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
6th Edition
ISBN: 9781319321710
Author: Mosca
Publisher: VST
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Chapter 17, Problem 80P

(a)

To determine

To Find: The height of the gas column.

(a)

Expert Solution
Check Mark

Explanation of Solution

Given:

Number of moles of gas, n=0.10mol

At STP, volume is V=2.24L

Mass of the piston, m=1.4 kg

Formula Used:

Ideal gas law:

  PV=nRT

Here, P is the pressure, V is the volume, R is the gas constant, n is the number of moles and T is the temperature.

Calculations:

Pressure inside the cylinder:

  Pin=Patm+mgAPin=nRTVV=hAnRThA=Patm+mgAh=nRTAPatm+mgh=(PatmV)APatm+mg

Substitute the values:

  h=(PatmV)APatm+mgV=(2.4m)(A)2.24×103m3=(2.4m)(A)A=9.33×104m2h=2.4m1+1.4kg×9.81m/s29.33×10-4m2×1.01×105Pah=2.1m

Conclusion:

Thus, the height of the gas column is 2.1 m.

(b)

To determine

To Find:The frequency of vibration of piston.

(b)

Expert Solution
Check Mark

Explanation of Solution

Given:

Number of moles of gas, n=0.10mol

At STP, volume is V=2.24L

Mass of the piston, m=1.4 kg

Formula Used:

Frequency of vibration of piston can be obtained by:

  f=12πkm

Here, m is the mass and kis the stiffness constant.

Calculations

In equilibrium position:

  PinAmgPatmA=0

Let the displacement from the equilibrium position be x .

  Pin'AmgPatmA=max

  Pin'APinA=max

From ideal gas law:

  Pin'V'=PinVPin'(V+Ax)=PinVPin'=PinV(V+Ax)Pin'=PinAh(Ah+Ax)Pin'=PinA(11+xh)PinA(1+xh)1PinA=maxx<<hPinA(1xh)PinA=maxnRTAh(Axh)=maxax=nRTmh2x

Condition of S.H.M:

  ax=kmxkm=nRTmh2f=12πnRTmh2

Substitute the values and solve:

  f=12π0.1mol×8.314J/mol×K×300K1.4kg×(2.1m)2f=1.0Hz

Conclusion:

Thus, the frequency of vibration of piston is 1.0 Hz.

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Chapter 17 Solutions

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