12 coefficient of linear expansion LINEAR THERMAL EXPANSION OF A SOLID The length of an object changes when its temperature changes:coefficient oflinear expansionCommon Unit for the Coefficient of Linear Expansion:
14 Example 3 The Buckling of a Sidewalk A concrete sidewalk is constructed betweentwo buildings on a day when the temperatureis 25oC. As the temperature rises to 38oC,the slabs expand, but no space is provided forthermal expansion. Determine the distance y in part (b) of the drawing.
17 Conceptual Example 5 The Expansion of Holes The figure shows eight square tiles that are arranged to form a square patternwith a hold in the center. If the tiled are heated, what happens to the size of thehole?
18 Conceptual Example 7 Expanding Cylinders Each cylinder is made from a different material.All three have the same temperature and theybarely fit inside each other.As the cylinders are heated to the same,but higher, temperature, cylinder C fallsoff, while cylinder A becomes tightly wedgedto cylinder B.Which cylinder is made from which material?
19 coefficient of volume expansion VOLUME THERMAL EXPANSION The volume of an object changes when its temperature changes:coefficient ofvolume expansionCommon Unit for the Coefficient of Volume Expansion:
20 An Automobile Radiator A small plastic container, called the coolant reservoir, catchesthe radiator fluid that overflows when an automobile enginebecomes hot. The radiator is made ofcopper and the coolant has anexpansion coefficient of4.0x10-4 (Co)-1. If the radiatoris filled to its 15-quart capacitywhen the engine is cold (6oC),how much overflow will spill into thereservoir when the coolant reaches itsoperating temperature (92oC)?
21 Why do they tell you to leave a faucet slightly open in the winter up north? .
22 HEATThe process by which energy is exchanged between objects because of a difference in their temperatures.SI: [J] – joulesJames Joule
23 12.6 Heat and Internal Energy DEFINITION OF HEATHeat is energy that flows from a higher-temperature object to a lower-temperatureobject because of a difference in temperatures.SI Unit of Heat: joule (J)
25 3 types of energy transfer ConductionConvectionRadiation
26 Conductionthe process whereby energy is transferred directly through a material without any bulk motion of its particles.Conduction is mostly common in solids.Depending on whether materials conduct heat easily, they are divided into conductors and insulators.