This question pertains to a lab where we are converting mechanical and electrica

Question

This question pertains to a lab where we are converting mechanical and electrical energy to heat.

I have a hunch about this answer but I need confirmation since this prelab question is worth 1/4 of my whole grade. The instructions in 3.1 that are relevant to this question are as follows:

6. However long you were cranking the system, continue to monitor it for that long again every thirty seconds. (Continue taking data without cranking until the time reaches 2tstop.. Clearly N no longer changes, but the resistance should rise slowly as the temperature of the aluminum cylinder decreases as it gradually tries to return to equilibrium with the environment.) This step is in place in order to make a rough estimate of how much energy was lost as heat dissipating into the environment. A change of 1-4 o C in this step would be typical. Talk to your TA if you observe something outside of this range.

AND in 3.2.1:

11. When the temperature increases by about 8°C, shut off the power but do not stop the timer. Record the time tstop and temperature. 12. As done in Section 3.1, continue to take temperature readings in 60-seconds intervals until the timer reads 2tstop . Continue swirling the water gently.

Now, for my hunches: I am guessing the effect we are trying to observe is equilibrium. Perhaps these measurements will show how much heat is lost to the environment and therefore have an effect in calculating the heat constant. Please tell me if this is correct, or if not, please tell me the correct answer. Thank you!

In both Section 3.1 (part 1) and Section 3.2.1 (part 2) you are asked to continue taking temperature measurements even after the heat source has been turned off. What effect are we trying to observe and how do we use this effect in our data analysis? [lpt]

Explanation / Answer

when we are taking temperature measurements even after the heat source is turned off, we are traying to measure the rate of colling of the appratus into the atmosphere , and this measurement helps us to calculate heat capacity of the appratus, or in newton's law of cooling the heat constant

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