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

游客2024-01-12 57

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

Howmuchlongeristheedgeofacubewithasurfaceareaof1,350thantheedge

Acircularwheeltravelsalongaflatsurfaceataconstantrateof2.5feetper

Inthefigureabove,theareaofthecircularregionwithcenterOis16π,ifAB

Dr.TonegawawontheNobelPrizefordiscoveringhowthebodycanconstantlycha

ElNino,theperiodicabnormalwarmingoftheseasurfaceoffPeru,aphenomenon

In1974alargeareaofthesurfaceofMercurywasphotographedfromvaryingdis

Incontrastwithadarksurfaceanditstendencytowardheatabsorption,alarge

[img]ct_gre5image038[/img]Arectangularlabelisattachedtoarightcircularc

[img]ct_gre5image022[/img]If9treesareoriginallyplantedinacircularpatte

[img]ct_4image006[/img]Asquaredartboardhasfourdarkcircularregionsofra

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Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies

Archaeologistshavelongthoughtthatstoneshipsservedasgravesforoneo

男性，55岁，双下肢无力半年，右侧明显，近2个月步态不稳，右手不能扣纽扣，无外伤

治疗冷秘，应首选（ ）。A.济川煎合黄芪汤 B.滋肾通关丸合润肠丸 C.温

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