Suppose We Place A $100-\mathrm{g}$ Aluminum Block with an Initial Temperature Of

Multiple Choice

Suppose we place a $100-\mathrm{g}$ aluminum block with an initial temperature of $100^{\circ} \mathrm{C}$ in a Styrofoam cup containing a $100 \mathrm{~g}$ sample of water at $0^{\circ} \mathrm{C}$ . (The specific heats of aluminum and water are $900 \mathrm{~J} \cdot \mathrm{kg}^{-1} \mathrm{~K}^{-1}$ and $4200 \mathrm{~J} \cdot \mathrm{kg}^{-1} \mathrm{~K}^{-1}$ , respectively.) The system's final temperature is closest to

A) $0^{\circ} \mathrm{C}$ .
B) $20^{\circ} \mathrm{C}$ .
C) $50^{\circ} \mathrm{C}$ .
D) $80^{\circ} \mathrm{C}$ .
E) $100^{\circ} \mathrm{C}$ .