PhysicsLAB CP Workbook
Thermal Expansion #2

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Refer to the following information for the next two questions.

Long steel bridges often have one end fixed while the other end rests on rockers, as shown.
 
 
Each sketch shows the bridge at a different season of the year.
Mark the sketches winter (W) or summer (S). Be prepared to defend your answer.
 
left sketch
 
right sketch
 
Refer to the following information for the next question.

The weight hangs above the floor from the copper wire.
 
When a candle is moved along the wire and heats it, what happens to the height of the weight above the floor? Why? 

Refer to the following information for the next question.

A steel television broadcasting tower is taller in the daytime than it is in the cooler nighttime. This is because steel expands (or contracts) about 1 part in 100,000 for each degree Celsius change. By this we mean that a piece of steel 100,000 units long will be 100,001 units long when its temperature increases by 1 Cº.
What is the change in height for a 500-m steel tower when its temperature changes 20 Cº from day to night?
 

 
 
Refer to the following information for the next question.

A common saying is "water seeks its own level," and usually it does. Here we see a container of water that is cooled on the left and warmed on the right. Consider the effect of temperature on density. 
 
Compared to the water level in the right tube, the water level in the left tube is
 
Refer to the following information for the next question.

The levels of water at 0ºC and 1ºC are shown below in the first two flasks. At these temperatures there is microscopic slush in the water. There is slightly more slush at 0ºC than at 1ºC. As the water is heated, some of the slush collapses as it melts, and the level of the water falls in the tube. That's why the level of water is slightly lower in the 1ºC-tube.
 
Discuss with your partner and make rough estimates regarding the appropriate levels of water at the other temperatures shown.
 
Describe your conclusion and explain what is important about the level when the water reaches 4ºC.
 

Refer to the following information for the next two questions.

The diagram below shows an ice-covered pond.
 
Mark the probable temperatures of water at the top and bottom of the pond.
 
top 

bottom 

 
 



 
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