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Overtheyears,Arecibohasfaceddangeranddamage,butithasalwaysendured.Initslifetime,ithasexperiencedearthquakesandstorms,includingthehurricanethatspoiltPuertoRicoin2017,whichdamagedsomeofthedish.ThetroublebeganinAugust.Ametalsupportcableweighingthousandsofpoundsslippedoutofitssocket(anddroppedsharplyintothecavernous,1,000-foot-wideradiodishinthemiddleofthenight.Thecable,installedinthe1990s,wasconsideredfairlynewforanobservatorythatbeganoperationsin1963,andtheincidentconfusedArecibo'sofficials.Thecable"definitelyshouldnothavefailedinthewayitdid,"AshleyZauderer,theAreciboprogramdirectorattheNationalScienceFoundation,whichownsthetelescope,said.Butearlierthismonth,justdaysbeforeengineerswerescheduledtotrytostabilizethetelescope,anotherpieceofhardwarecamesmashingintothedish.Amaincable,oneoftheoriginalsinstalledwhentheobservatorywasbuilt,hadcracked,causingevenmoredamage.Engineersarenowworkingtoquicklyoutlinedaplantopulldownthetelescopebeforeitcollapsesonitsown.Arecibo'sfailureisadifferentfatethanastronomersareusedto.Hardwareofallsortsagesandbreaks-Hubble,anotherfamedtelescope,isoperatingwithfewerworkingpartsthanitlaunchedwith30yearsago.Butitisunusualtowreckanobservatorybecauseyouhavenootherchoice,andsounexpectedlytoo.32.WhatwillhappentoArecibo?A.Itwillbedestroyed.B.Itwillberebuilt.C.Itwillberepaired.D.Itwillbestabilized.33.Whatdoestheunderlinedword"endured"meaninparagraph2?A.Avoided.B.Survived.C.Endangered.D.Forgotten.34.WhichcanbestexplainAshleyZauderer'smessageinparagraph3?A.Arecibocanberemovedeasily.
0.如图所示,某人从高出水平地面h的坡顶上水平击出一个质量为m的高尔夫球(可视为质点),坡顶可视为半径为R的圆弧,高尔夫球飞出前瞬间对地面的压力恰好为0.高尔夫球落人水平地面的A洞中(不计洞穴的宽度及深度),不计空气阻力,重力加速度大小为g,则2hgC.该球落人A洞时的动2hRD.A洞到坡顶的距离为√2hRA.该球飞出的初速度大小为ghB.该球在空中运动的时间为12mg(R+2h)
