Physics 101: Lecture 23 Temperature and Ideal Gas
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1 EXAM III Physics 101: Lecture 23 Temperature and Ideal Gas Today s lecture will cover Textbook Chapter Temperature of Earth s surface/clouds from NASA/AIRS satellite Physics 101: Lecture 23, Pg 1
2 Doppler Effect moving source v s Knowing if Vo and Vs are negative or positive. When source is coming toward you (v s > 0) Distance between waves decreases Frequency is higher When source is going away from you (v s < 0) Distance between waves increases Frequency is lower f o = f s / (1- v s /v) Physics 101: Lecture 23, Pg 2
3 Doppler Effect moving observer (v o ) When moving toward source (v o < 0) Time between waves peaks decreases Frequency is higher When away from source (v o > 0) Time between waves peaks increases Frequency is lower f o = f s (1- v o /v) Combine: f o = f s (1-v o /v) / (1-v s /v) Physics 101: Lecture 23, Pg 3
4 Doppler sign convention Doppler shift: f o = f s (1-v o /v) / (1-v s /v) v s = v(source) v o = v(observer) + If same direction as sound wave - If opposite direction to sound wave v = v(wave) Physics 101: Lecture 23, Pg 4
5 Doppler ACT A: You are driving along the highway at 65 mph, and behind you a police car, also traveling at 65 mph, has its siren turned on. B: You and the police car have both pulled over to the side of the road, but the siren is still turned on. In which case does the frequency of the siren seem higher to you? A. Case A B. Case B C. same f v f v s v o Physics 101: Lecture 23, Pg 5
6 Internal Energy and Temperature All objects have internal energy (measured in Joules) random motion of molecules» kinetic energy collisions of molecules gives rise to pressure Amount of internal energy depends on temperature» related to average kinetic energy per molecule how many molecules» mass specific heat» related to how many different ways a molecule can move translation rotation vibration» the more ways it can move, the higher the specific heat Physics 101: Lecture 23, Pg 6
7 Zeroth law of Thermodynamics If two objects are in thermal equilibrium with a third, then the two are in equilibrium with each other. If they are in equilibrium, they are at the same temperature Physics 101: Lecture 23, Pg 7
8 Temperature Scales Fahrenheit Celsius Kelvin Water boils Water freezes 9 F C 32 5 K C C F C K NOTE: K=0 is absolute zero, meaning (almost) zero KE/molecule Physics 101: Lecture 23, Pg 8
9 Sick Act You measure your body temperature with a thermometer calibrated in Kelvin. What do you hope the reading is (assuming you are not trying to fake some sort of illness)? A. 307 K F 98.6 B. 310 K 5 C (F -32) 37 C. 313 K 9 D. 317 K K C Physics 101: Lecture 23, Pg 9
10 Temp Scales ACT Two cups of coffee are heated to 100 degrees Fahrenheit. Cup 1 is then heated an additional 20 degrees Centigrade, cup 2 is heated an additional 20 Kelvin. Which cup of coffee is hotter? A) One B) Two C) Same Physics 101: Lecture 23, Pg 10
11 Thermal Expansion When temperature rises molecules have more kinetic energy» they are moving faster, on the average consequently, things tend to expand amount of expansion depends on change in temperature original length Temp: T Temp: T+ T coefficient of thermal expansion» L = L 0 T (linear expansion)» V = V 0 T (volume expansion) L 0 L Physics 101: Lecture 23, Pg 11
12 Density ACT As you heat a block of aluminum from 0 C to 100 C its density A. Increases B. Decreases C. Stays the same T = 0 C T = 100 C M, V 0 M, V 100 Physics 101: Lecture 23, Pg 12
13 Differential Expansion ACT A bimetallic strip is made with aluminum =16x10-6 /K on the left, and iron =12x10-6 /K on the right. At room temperature, the lengths of metal are equal. If you heat the strips up, what will it look like? A B C Physics 101: Lecture 23, Pg 13
14 Density (kg/l 3 ) Swimming Preflight Not being a great athlete, and having lots of money to spend, Gill Bates decides to keep the lake in his back yard at the exact temperature which will maximize the buoyant force on him when he swims. Which of the following would be the best choice? A. 0 C B. 4 C C. 32 C D. 100 C E. 212 C Temperature Density Physics 101: Lecture 23, Pg 14 32
15 Tight Fit Preflight An aluminum plate has a circular hole cut in it. An aluminum ball (solid sphere) has exactly the same diameter as the hole when both are at room temperature, and hence can just barely be pushed through it. If both the plate and the ball are now heated up to a few hundred degrees Celsius, how will the ball and the hole fit? A. The ball won t fit through the hole any more B. The ball will fit more easily through the hole C. Same as at room temperature demo Physics 101: Lecture 23, Pg 15
16 Why does the hole get bigger when the plate expands??? Imagine a plate made from 9 smaller pieces. Each piece expands. If you remove one piece, it will leave an expanded hole Object at temp T Same object at higher T: Plate and hole both get larger Physics 101: Lecture 23, Pg 16
17 Stuck Lid Act A glass jar ( = 3x10-6 K -1 ) has a metal lid ( =16x10-6 K -1 ) which is stuck. If you heat them by placing them in hot water, the lid will be A. Easier to open B. Harder to open C. Same Physics 101: Lecture 23, Pg 17
18 Jar Act A cylindrical glass container ( = 28x10-6 K -1 ) is filled to the brim with water ( =208x10-6 K -1 ). If the cup and water are heated 50C what will happen A) Some water overflows B) Same C) Water below rim Physics 101: Lecture 23, Pg 18
19 Molecular Picture of Gas Gas is made up of many individual molecules Number density is number of molecules/volume N/V = r/m r is the mass density m is the mass for one molecule Number of moles n=n / N A N A = Avogadro s number 6.022x10 23 mole -1 Physics 101: Lecture 23, Pg 19
20 Number Density ACT Two gas cylinders are filled such that they have the same mass of gas (in the same volume). One cylinder is filled with Helium, the other with Oxygen. Which container has the larger number density? A) Helium B) Oxygen C) Same Physics 101: Lecture 23, Pg 20
21 Summary Temperature measure of average Kinetic Energy of molecules Thermal Expansion L = L 0 T (linear expansion) V = L 0 T (volume expansion) Gas made up of molecules Physics 101: Lecture 23, Pg 21
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(Heat capacity c is also called specific heat) this means that the heat capacity number c for water is 1 calorie/gram-k.
Lecture 23: Ideal Gas Law and The First Law of Thermodynamics 1 (REVIEW) Chapter 17: Heat Transfer Origin of the calorie unit A few hundred years ago when people were investigating heat and temperature
Exercises Temperature (pages ) 1. Define temperature. 2. Explain how a common liquid thermometer works.
Chapter 21 Temperature, Heat, and Expansion Exercises 21.1 Temperature (pages 407 408) 1. Define temperature. 2. Explain how a common liquid thermometer works. Match each number with the corresponding
High temperature He is hot
Lecture 9 What is Temperature and Heat? High temperature He is hot Some important definitions * Two objects are in Thermal contact with each other if energy can be exchanged between them. Thermal equilibrium