A solid copper sphere (density \( \rho \) and specific heat \( c \)...

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A solid copper sphere (density \( \rho \) and specific heat \( c \) of of radius \( r \) at an initiaial temperature \( 200 \mathrm{~K} \) is suspenced inside a chamber whose walls are at almost \( 0 \mathrm{~K} \). Calculate the time required for the temperature of the sphere to drop to \( 100 \mathrm{~K} \).
(II)
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