You are working for Telkom in Upington and they ask you to measure the physical distance between two telephone poles with a steel tape on a day when the temperature is almost 45 degrees Celsius. You measure a distance of exactly 50m on this day with the steel measuring tape (α=1.2x10-5/K). You were then asked to verify your data (i.e. the 50 m distance) a month later when the temperature was now only 5 degrees Celsius using the same steel tape. a) Why do you think the steel tape will give a controversial answer in the cold weather? b) Explain (using words and a calculation) whether you expect to find a distance of more than 50 m or less than 50 m between the 2 poles at 5 degrees celsius.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
You are working for Telkom in Upington and they ask you to measure the physical distance between two telephone poles with a steel tape on a day when the temperature is almost 45 degrees Celsius. You measure a distance of exactly 50m on this day with the steel measuring tape (α=1.2x10-5/K). You were then asked to verify your data (i.e. the 50 m distance) a month later when the temperature was now only 5 degrees Celsius using the same steel tape.
a) Why do you think the steel tape will give a controversial answer in the cold weather?
b) Explain (using words and a calculation) whether you expect to find a distance of more than 50 m or less than 50 m between the 2 poles at 5 degrees celsius.
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