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

游客2025-02-23 34

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

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DISPARATE:A、helpfulB、increasingC、constantD、homogeneousE、convincingD

Thedriverwasexcessively______,constantlyapologizingforthecar’spoorsusp

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SEPTIC:A、constantB、consistentlyarrangedC、devoidofinfectionD、ofunidentifie

DISPARATE:A、helpfulB、increasingC、constantD、homogeneousE、convincingD

Scientistsbelievethatbyraisingatmosphericpressureandsurfacetemperature,

Whenhomeisapproximately2,000feetunderthesurfaceofthesea,itischalle

Infrigidregionsalayerofpermafrostunderthesoilsurfacepreventswaterfr

Ryan’s______botheredhisfriends,whotiredofinstabilityandconstantchanges

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男，40岁，持续发热、右下胸胀痛1个月，体温37～39℃，盗汗、消瘦，2天前突起

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