PhysicsLAB CP Workbook
Thermal Expansion #1

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FORMULAS: ΔL = αLΔT ΔA = (2α)AΔT ΔV = βVΔT
  linear expansion area expansion volume expansion


Selena has a fire in her fireplace to warm her 20°C apartment. She realizes that she has accidentally left the iron poker (αiron = 12 x 10-6 C°-1)  in the fire. How hot is the fire if the 0.60-meter poker lengthens 0.30 cm? 


As he rides the train to work on a -4°C winter day, Mr. Trump notices that he can hear the click of the train going over the spaces between the rails. Six months later, on a 30°C summer day, the rails are pushed together and he hears no clicks. If the rails are 5 meters long when the temperature is 30°C, how large a gap is left between the steel rails  (αsteel = 12 x 10-6 C°-1) on the cold winter day? 


A popular winter activity of many college students is "traying," or sliding down a snow-covered hill on a tray borrowed from the dining hall. If Joanne removes a 0.35 meter x 0.65 meter aluminum tray (αaluminum = 24 x 10-6 C°-1) from the 20°C dining hall to go traying outside in the brisk -8°C winter air, how much will the tray shrink when it is taken outside? 

Refer to the following information for the next two questions.

Most bridges contain interlocking steel grates (αsteel = 12 x 10-6 ºC-1) that allow the bridge to expand and contract with the changes in temperature. The Golden Gate Bridge in San Francisco is about 1350 meters long.
The seasonal temperature variation in San Francisco ranges from about 0°C to 30°C. How much will the bridge expand between these two extremes? 

What percent of the length of a subcompact automobile, 2.5 meters, does this gap represent? 

Refer to the following information for the next two questions.

Just before midnight, when the air temperature of 10.0°C, Karl stops and fills the 0.0600 m3 gas tank in his car. At noon the next day, when the temperature has risen to 32°C, Karl finds a puddle of gasoline  (βgas = 3 x 10-4 C°-1) beneath his car.
What happened? 

How much gasoline spilled out of Karl's car? (assume that there was virtually no change in the volume of his tank) 




 
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