[題目] 請問三題計算題
這兩題為大學轉學考考古題
可以請版友幫忙 解答
1.(a)A Carnot engine operates between a hot reservoir at 320K and a cold one
at 260K. If the engine absorbs 500J as heat cycle at the hot reservoir,
how much work per cycle does it deliver?
(b)If the engine working in reverse functions as a refrigerator between the
same two reservoirs,how much work per cycle must be supplied to remove
1000J as heat from the cold reservoir?
2.An electric dipole with dipole moment →p=(3.00i+4.00j)(1.24x10^-30 C‧m)
is in an electric field →E=(4000 N/C)i
(a)What is the potential energy of the electric dipole?
(b)What is the torque acting on it ?
(c)If an external agent turns the dipole until its electric dipole moment is
→p=(-4.00i+3.00j)(1.24x10^-30 C‧m), how much work is done by the agen?
3.在溫度T很低的時候,許多固體的定容摩耳比熱Cv與溫度的關係可以近似為Cv=AT^3,
其中A與特定的材料有關,對鋁而言,A=3.15x10^-5 J/molx k^4.
求；4.00 mol 的鋁,溫度由5.00K上升到10.0K時,entropy(熵)的改變量.
這三題不知道是那個範圍
也不瞭解該使用那個公式
可以請版友解答
感謝
幫忙
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◆ From: 140.137.49.2
※ 編輯: flygey 來自: 140.137.49.2 (07/05 23:45)
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07/06 00:41, , 1F
07/06 00:41, 1F