A disc rotated about its central axis and gently placed on another ...

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A disc rotated about its central axis and gently placed on another coaxial disc at rest. Due to friction between the two
\( \mathrm{P} \) first dise retards and the second one starts rotating and after

W some time both with rotate with a common angular speed. In this process the total internal energy of the system of two discs does not change. State and justify whether this statement is true or false.
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