The Physics of Everyday Phenomena
8th Edition
ISBN: 9780073513904
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 13, Problem 33CQ
Why does a bimetallic strip bend when the temperature changes? Explain. (See everyday phenomenon box 13.2.)
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4. The diagram shows four slabs of different materials with equal thickness, placed side
by side. Heat flows from left to right and the steady-state temperature of the interfaces
are given. Rank the materials according to their thermal conductivities, smallest to
largest.
1
+ d →+ d →+ d – E d →
1
2
3
4
35° C
30° C 20° C
0° C
-15° C
а. 1, 2, 3, 4
b. 2, 1, 3, 4
с. 3,4, 1, 2
d. 3, 4, 2, 1
QUESTIONS
1. Most modern electrical heating and cooling devices are provided with thermostat.
What is the purpose of the thermostat in these devices? Why are these devices
equipped with thermostats?
2. Aside from being transparent, why are laboratory apparatus such as graduated
cylinder, beakers, and flasks made up of glass?
3. What will happen to steel railroad tracks on a hot day if the tracks were laid out
during a cold day without clearance or gap? Justify your answer.
MED2.docx →
GROUB C
Example 1
A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2
mm thick plastic cover whose thermal conductivity is k= 0. 15 W/ m °C.
Electrical measurements indicate that a current of 5 A passes through the
wire and there is a voltage drop of 8 V along the wire. If the insulated
wire is exposed to a medium at To = 288,15 K with the heat transfer
coefficient of h = 12 w/ m² °C. Determine the temperature at the interface
of wire and the plastic cover in steady operation.
Example 2
Calculate the amount of heat loss (in Watts) through an uncovered
window in a home. The temperature difference between the air inside and
outside of the house is 200C, with moderate convection on each side of
the glass. The size of the glass is 0.75m by 1.2 m, and the thickness is 3
mm. hin = 25 W/ m² °C and hout = 45 W/ m² °C and k = 0,81 W/ m °C
%3D
%3D
EXAMPLE 3
Steam at a temperature of 300 °C flows through a steal pipe, k= 14.9
W/m.K of 60 mm inside diameter and 80 mm…
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- A length of iron wire is connected to a constant voltage source and a current of 0.3 A is precisely measured at a temperature of 28°C. The temperature of the wire increases and later the current is 0.26 A. Determine the temperature of the wire when the current is 0.26 A. For iron, a = 0.00651 °C-1 at 20°C. answer- °C please explain dont skip steps pleasearrow_forwardWill save this response. Question 3 of 45 Question 3 Note: Round off your answer to the nearest whole number. Input the numerical value only. Problem. A composite wire to be used as an integral component of a switch in an electrical device is composed of wire A and wire B. The wire has effective linear expansion coefficient of 0.000024 per Celsius-degree. What percentage of the total length of the composite wire is wire B? The linear expansion coefficient of wire A is 0.000011 per Celsius-degree. The linear expansion coefficient of wire B is 0.000035 per Celsius-degree.arrow_forwardWhen our bodies are hot, they produce sweat, which helps to cool us down. Using this fact, determine whether your skin or sweat has a higher conductivity. Explain your reasoning.arrow_forward
- II. Statement Analysis. Read and analyze the following problems. Choose the correct letter corresponding to your answers Choose: A - if statement I is TRUE, but statement Il is FALSE B- if statement I is FALSE, but statement II is TRUE C- both statements are TRUE D- both statements are FALSE I Krypton gas (Kr) has a greater average molecular speed than methane gas (CH4) at 25 degrees Celsius. In a container containing a mixture of O2 and He gas, if there is a small hole on the side of the container, O2 is lost faster than He.arrow_forwardREVIEW QUESTIONS 1. What is the normal body temperature on the fahrenheit, celsius, and kelvin scales? 2. What physical quantity changes with temperature in a thermistor? In a thermocouple? 3. Consider a fever thermometer that contains 0.01 cm of mercury. Find the diameter of the capillary if a 1'C change corresponds to a level change of 0.5 cm. Assume the glass does not expand. 4. What techniques are used to increase the visibility of the small capil- lary of a fever thermometer? 5. How does a thermographic unit measure skin temperature? 6. What are the two primary therapeutic effects of heating the body? 7. List four techniques for heating parts of the body. 8. How does ultrasonic diathermy differ from microwave diathermy? 9. How does a dewar container minimize heat transfer to a cryogenic fluid? 10. (a) What is the optimum cooling rate for preserving red blood cells? (b) At the optimum rate, how long would it take to cool red blood cells from 37 to -196 C?arrow_forwardQUESTION 16 Which of the following statements is not true according to kinetic theory? a. Electrical attractions and repulsions between the molecules must be accounted for in the total energy of the ideal gas. b. The energy of an ideal gas only depends on the kinetic energy of the gas. C. The average energy of a molecule in an ideal gas is evenly distributed between the different degrees of freedom of the molecule. d. The molecules in an ideal gas undergo elastic collisions. e. The molecules in an ideal gas only interact during collisions.arrow_forward
- 20. The kinetic molecular model of an ideal gas shows that * 1 average translational kinetic energy of a molecule is inversely proportional to the absolute temperature average translational kinetic energy of a molecule is directly proportional to the absolute temperature average translational kinetic energy of a molecule is not dependent to the absolute temperature average translational kinetic energy of a molecule is equal to the absolute temperature 21. The first law of thermodynamics helps us understand the relationships 11 among which three quantities? Heat, work, and internal energy O Heat, work, and external energy O Heat, work, and entropy O Heat, work, and enthalpyarrow_forwardWhich one of the following statements is incorrect? A. The metal with higher a value expands more than the one with lower a value for the same temperature change. B. The amount a metal expands depends on a, its original length and the temperature change. C. The metal with lower a value expands more than the one with higher a value for the same temperature change. D. The SI unit of all expansion coefficients is K-1.arrow_forward1. The filament of a light bulb radiates energy into space at a rate of 4.0 W at a temperature of 500 K. At what temperature will it radiate at a rate of 16.0 W? 2. This room can be considered a leaky container. Suppose the temperature of the air in the room increases from 20.0 oC to 25.0 oC. By approximately what percentage does the number of molecules in the room change? 3. A material with area 40. cm by 60. cm is 10. cm thick and conducts heat at a rate of 50. W when the difference in temperatures between the two sides is 30. oC. What is the thermal conductivity constant of this material? 4. Suppose an ideal engine takes a gas through a Carnot cycle. If it runs at an efficiency of 45% and produces 25 J of waste heat at a temperature of 27 oC each cycle, how much work does it do each cycle, and what is the temperature of the heat reservoir? 5. Suppose a soda bottle is shaken up, and the pressure inside the bottle is 1.10 atm. If the lid has an area of 5.0 cm2 , approximately how…arrow_forward
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