沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

沒有 【段考】國二理化下學期 權限，請先開通．

1. The capacitance of a cylindrical capacitor can be increased by: (A) decreasing both the radius of the inner cylinder and the length. (B) increasing both the radius inner cylinder and the length. (C) increasing the radius outer cylindrical shell and decreasing the length. (D) decreasing the radius inner cylinder and increasing the radius of the outer cylindrical shell. (E) only by decreasing the length.

2.A layer of oil with density 800 kg/m 3 floats on top of a volume of water with density 1,000 kg/m 3 . A block floats at the oil-water interface with 1/4 of its volume in oil and 3/4 of its volume in water, as shown in the figure below. What is the density of the block ? (A) 200 kg/m3 (B) 850 kg/m3 (C) 950 kg/m3 (D) 1,050 kg/m3 (E) 1,800 kg/m3