MEGR3116 Ch 5.1-5.3 Transient Conduction with No Spatial Effects Lumped Capacitance Method

Please reference Chapter 5.1-5.3 of Fundamentals of Heat and Mass Transfer, by Bergman, Lavine, Incropera, & DeWitt

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Shouldn't the final equation at 12:40 include a natural logarithm (ln) around the temperature difference ratio and a negative sign?