Problem D20:
A substance starts out as a solid at temperature T_{0}.
Heat is added at a **constant rate**. The temperature of the
substance is shown in the graph below. For the first n_{1}
seconds the substance melts. From time n_{1} to time
n_{2} the substance is in the liquid state. The
temperature at time n_{2} is T = T_{0} +
n_{3} L/c, where L is the latent heat of fusion and c is the
specific heat capacity for the liquid state. L/c has the same units
of temperature as T_{0} and T.
what is n_{3}? Note that n_{1} and n_{2}
have the same units of time, and n_{3} is unitless.

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