A circular wheel travels along a flat surface at a constant rate of 2.5 feet per

游客2024-01-13 24

问题 A circular wheel travels along a flat surface at a constant rate of 2.5 feet per second. How many complete revolutions will the wheel make in 50 seconds if its diameter is 3 feet?

选项 A、6
B、10
C、13
D、14
E、19

答案 C

解析 50秒内轮子走过的距离：轮子的周长(πd)×圈数。50×2.5=π×3×revolutions=13＜revolution＜14。

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A circular wheel travels along a flat surface at a constant rate of 2.5 feet per

Constantshowersarecharacteristic________thesummerhere.A、forB、toC、ofD、wit

Acircularwheeltravelsalongaflatsurfaceataconstantrateof2.5feetper

Thetopsurfaceareaofasquaretabletopwaschangedsothatoneofthedimensi

Acircularrim28inchesindiameterrotatesthesamenumberofinchespersecon

MachinesXandYrunatdifferentconstantrates，andmachineXcancompleteace

Inthefigureabove,theareaofthecircularregionwithcenterOis16π,ifAB

MostofEarth’ssurfaceisocean.Theoceanfloorisinaccessibleforextensive

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In1974alargeareaofthesurfaceofMercurywasphotographedfromvaryingdis

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