本题目来源于试卷: Physics Unit14: Heat，类别为 通用国际物理
[单选题]
The heat of fusion of lead is 5.9 kcal/kg, and thewefca-swg ; be 5h:8o4 heat of vaporizat:a9rp z3-mydpo u5 s/tion is 207 kc3ya :o d5u/p-sm9przt al/kg, and its melting point is $328 \; ^{\circ}C$. How much heat is required to melt 50 g of lead initially at $23 \; ^{\circ}C$? (The specific heat of lead is $0.031 \; kcal/kg \cdot ^{\circ}C$)
A. $678 \; cal$
B. $687 \; cal$
C. $768 \; cal$
D. $876 \; cal$
参考答案: C
本题详细解析:
暂无
| 
