An electronic device dissipating 25 w has a mass of 20 g and a specific heat of 850 j/kg·0k. the device is lightly used, and it is on for 5 min and then off for several hours, during which it cools to the ambient temperature of 250c. let the mass of heat sink vary from 0 to 1 kg. plot the maximum temperature against the mass of heat sink, and discuss the results. u

Explanation:

FIrst let c be the specific heat, now we need the heat that the device is able to provide:

so it is turned on for 5 minutes (300 seconds) with 25 Watts

Now heat is equal to the change in internal energy, where we will use the remaining terms.

Now we continue

where is the change of temperature ( )

now

We solve

now we just plot it for different values of M using any software..

please find attached the plot of the temperature.

The result indicates that as the mass increases it is harder for the system to reach higher final temperatures.

answer:

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