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 

3. X rays of wavelength λ= 0.250 nm are incident on the face of a crystal at angle θ, measured from the crystal surface. The smallest angle that yields an intense reflected beam is θ = 14.5°. Which of the following gives the value of the interplanar spacing d? ( sin 14.5° 1/4 )(A)0.125 nm (B) 0.250 nm (C) 0.500 nm (D) 0.625 nm (E) 0.750 nm

 4. A rod of length L and mass M is placed along the x-axis with one end at the origin, as shown in the figure below. The rod has linear mass density , where x is the distance from the origin. Which of the following gives the x-coordinate of the rod’s center of mass? (A) (B) (C) (D)(E)