19. 如圖所示電路,VA、VB為同阻值之電阻性負載,當開關閉合後,則VA及VB的關 係為何?
(A) V A =0 V
(B) V B =0 V
(C) VA =VB =12 V
(D) VA =12 V A ,VB =0 V
四、薄壁箱型斷面尺寸如圖四所示,假設斷面材料性質 G,斷面預期受到之扭力 T、垂直剪力 V、橫向水平剪力 H。請試述下列關於剪力流之問題;(作答過程可維持參數符號或以下列代表值進行計算,G=10 GPa、
T=1 kN-m、V=H=1 kN、h=1 m、t=10 cm)
25. Consider the following gas samples:
Which of the following statements is NOT TRUE?
(A) Assuming identical intermolecular forces in the two samples, sample M should be more
nearly ideal than sample N.
(B) The root-mean-square velocity of molecules in sample M is twice as large as the root-
mean-square velocity of molecules in sample N.
(C) The average kinetic energy of the molecules in sample M is twice the average kinetic
energy of the molecules in sample N.
(D) The fraction of molecules in sample M having kinetic energies greater than some high
fixed value is larger than the fraction of molecules in sample N having kinetic energies
greater than that same high fixed value.
(E) The volume of sample M is twice the volume of sample N.