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A student walking to class on a cold day ( T o = 5 C) find a silver ring with an inner diameter of D

A student walking to class on a cold day (T_o = 5 C) find a silver ring with an inner diameter of D = 1.7 cm. The silver has a coefficient of linear expansion of = 19.7 10^-6 1/C.

Part A. Input an expression for the rings inner diameter D_h when the student warms it to their body temperature, T_b.

Part B. What is the change in diameter, in units of millimeters, if T_b = 37 C?

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