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Thermal & Kinetic Lecture 22 Problems Class II PowerPoint PPT Presentation


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Thermal & Kinetic Lecture 22 Problems Class II. Thermal & Kinetic paper, ’04/’05: Q1. Is it possible for the temperature of an ideal gas to rise without heat flowing into the gas?. Yes No Don’t know.

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Thermal & Kinetic Lecture 22 Problems Class II

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Thermal kinetic lecture 22 problems class ii

Thermal & Kinetic

Lecture 22

Problems Class II


Thermal kinetic lecture 22 problems class ii

Thermal & Kinetic paper, ’04/’05: Q1


Is it possible for the temperature of an ideal gas to rise without heat flowing into the gas

Is it possible for the temperature of an ideal gas to rise without heat flowing into the gas?

  • Yes

  • No

  • Don’t know


Must the temperature of an ideal gas necessarily change as a result of hear flow into or out of it

Must the temperature of an ideal gas necessarily change as a result of hear flow into or out of it?

  • Yes

  • No

  • Don’t know


Thermal kinetic lecture 22 problems class ii

Thermal & Kinetic paper, ’02/’03: Paper 2, Q2


Thermal kinetic lecture 22 problems class ii

…compare to CW Set 4

  • Q1. 1 mole of an ideal gas originally at a pressure of 1.0 x 104 Pa and occupying a volume of 0.2 m3 undergoes the following cyclic process:

  • an adiabatic compression until the pressure is 3.0 x 104 Pa;

  • an isobaric expansion to a volume of 0.4 m3;

  • an isothermal expansion until the pressure reaches 1.0 x 104 Pa;

  • an isobaric compression to the original volume of 0.2 m3.

  • Draw a PV diagram for this process [3].

  • For each of the stages (i) – (iv) calculate the heat transferred [5], the work done [5], and the change in internal energy [5].

  • Show that only internal energy is a function of state [2].


Thermal kinetic lecture 22 problems class ii

F31ST1 CW4


Thermal kinetic lecture 22 problems class ii

Thermal & Kinetic paper, ’06/’07: Q7


What do you need to use to solve this type of pv cycle question

What do you need to use to solve this type of PV cycle question?

  • Ideal gas law: PV = nRT

  • First law: DU = Q + W

  • Equation for adiabatic, P1V1g = P2V2g

  • Equation for adiabatic work:

  • Q = CvDT (isochoric);

  • Q = CPDT (isobaric)

  • Work done in isothermal, isobaric, isochoric process

  • Only internal energy is a function of state


Thermal kinetic lecture 22 problems class ii

Numerical answers to all (past!) exam questions are on web at:

http://www.nottingham.ac.uk/physics/intranet/undergrad/ug_numericalanswers.php


Thermal kinetic lecture 22 problems class ii

Q5. F31ST1 ’03 – ’04 Exam Paper


What is the net change in internal energy of the gas for one cycle of the engine

What is the net change in internal energy of the gas for one cycle of the engine?

  • 0 J

  • 90 J

  • 180 J

  • 60 J

  • Don’t know


When moving from point a to point b what is the change in the volume of the gas

When moving from point A to point B, what is the change in the volume of the gas?

  • 90 m3

  • 2 m3

  • 45 m3

  • 32 m3

  • Don’t know


Thermal kinetic lecture 22 problems class ii

Q3. F31ST1 ’06 – ’07 Exam Paper


Dimensions of boltzmann s constant

Dimensions of Boltzmann’s constant?

  • M2L2 T2Q

  • M2L2 T2Q-1

  • M2LT-1Q-1

  • ML2 T-2Q-1

  • Don’t know


Thermal kinetic lecture 22 problems class ii

If the energy levels are spaced by 0.25 eV and the number of molecules with energy E1 is a factor of 10-5 smaller than the number with energy E0, calculate the value of T.

  • 101 K

  • 2112 K

  • 273 K

  • 252 K

  • None of these

  • Don’t know


Thermal kinetic lecture 22 problems class ii

Q2. F31ST1 ’04 – ’05 Exam Paper


How many ways are there of distributing the energy

How many ways are there of distributing the energy?

  • 6

  • 180

  • 10

  • 2112

  • Don’t know


Thermal kinetic lecture 22 problems class ii

What is the probability of finding the system in a state where each oscillator has one quantum of energy?

  • 50%

  • 8%

  • 10%

  • 1%

  • Don’t know


Thermal kinetic lecture 22 problems class ii

Q8(b). F31ST1 ’05 – ’06 Exam Paper


Total energy of configuration b

Total energy of configuration B?

  • e

  • 2e

  • 4e

  • 5e

  • Don‘t know


Thermal kinetic lecture 22 problems class ii

Q8(b). F31ST1 ’05 – ’06 Exam Paper


What is the equilbrium temperature of the system

What is the equilbrium temperature of the system?

  • 100 C

  • 50 C

  • Neither of these

  • Don’t know


Will the total change in entropy be

Will the total change in entropy be:

  • Positive

  • Negative

  • Zero

  • Don’t know


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