thhzpvx的部落格

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幫我計數OK??(Thx)

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幫我計以下的問題:1)The volume of a cylinder is V.If the base radius is doubled and the height is unchangad.Find the volume of the new cylinder.A. 2VB. 4VC. 8VD. 9VE. 16V2) A sphere is inflated with air.If the surface area of the sphere is increased by 21%, what is the percentage change of its... 顯示更多 幫我計以下的問題: 1)The volume of a cylinder is V.If the base radius is doubled and the height is unchangad.Find the volume of the new cylinder. A. 2V B. 4V C. 8V D. 9V E. 16V 2) A sphere is inflated with air.If the surface area of the sphere is increased by 21%, what is the percentage change of its volume? A. increase 10% B. increase 21% C. increase 33.1% D. decrease 21% E. decrease 33.1% 3)The figure shows a cylinder with baseradius 4 cm.The cylinder contains water with height h cm.A sphere with radius 4cm is immersed(浸入) into the cylinder,the water just covers the sphere.Find the value of h. A. 2 cm B. 3 cm C. 2/3 cm D. 4/3 cm E. 8/3 cm 4) The vertical angle of a right cone is 60 °.If the curved surface area of the cone is72πcm(square),find the volume of the cone. A. 72√3πcm(cube) B. 1443πcm(cube) C. 144√3 πcm(cube) D. 216√3πcm(cube) E. 432πcm(cube) 更新: 最遲在4:00前完成(快!快!!快!!!)

最佳解答:

1.B 2^2V＝4V 2.C 1.21^(3/2)－1＝0.331=33.1% 3.E 16π(4^2)h＋(4/3)π(4^3)＝π(4^2)8＝＞h＝8－(4/3)4=8－16/3＝8/3 4.C [π(2r)^2][[2πr/[2π(2r)]]＝72π＝＞r＝6, V＝(1/3)π(r^2)(√3 r)＝144π√3

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