Use the following table to answer the questions: a)One of the cases above takes

Question

Use the following table to answer the questions:

a)One of the cases above takes a much longer time to reach a common equilibrium temperature. Can you think of a factor that might be impacting the time to equilibrium? Hint: review your heating times in Table I and see if you can make a connection. *will post table 1 below question b

b) Although each cube starts off at the same temperature they reach different equilibrium temperatures. Why?

TABLE ONE FOR QUESTION A

Cube Initial Cube FinalLiquid Initial Liquid Final Equilibrium Cube Temp (°C)Temp (°C)Temp (°C) Temp (°C) Time (s) 60.00 °O 26.26°C 20.00°C 26.25°C 42.50 s Quartz 2 80.00 °C 29.37"? 20.00"? 29.37"? 46.30 s 60.00"? 28.04"? 20.00"C 28.04"? 28.50 s Ruby 2 80.00 °C 32.05"? 20.00"C 32.05 °C 33.40 s 60.00 C 26.74 °C 20.00 C 26.74 °C 25.00 s Aluminum 2 80.00 °C 30.11 °C 20.00 C 30.11 °C 26.90 s 60.00 C 26.74 °C 20.00 C 26.74 °C 24.50 s Gold 2 80.00 °C 30.12°C 20.00 °C 30.12°C 23.20 s

Explanation / Answer

(a) Quartz takes a longer time than other metals. The reason is the low heat conductivity of the quartz material. The flow of heat from the bulk of cubes to the surface is by conduction and after heat reaches the surface it is lost due to convection. The other bodies being metallic have high concuctivity and hence they lose heat in less time than quartz which havs less confuctivity.

(b) The equilibrium temperature depends upon the specific heat of the material. Each has different specific heat and they hence, lose different heat to liquid. Thats why liquid comes to a different level of temperature. If some material has high heat capacity, it will lose less heat and hence liquid will get low energy and hence it will rise to small levels in temperature. On the other hand, material with low heat capacity will dump more heat to liquid and its temperature will rise to higher values.

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