act科学 题目4.doc

act科学 题目4.docPassageIVSpentfuel(SF),aradioactivewaste,,SFgenerateshighheatandraisesthetemperatureofthesurroundingrock,whichmayexpandandcrack,—rocksalt,granite,basalt,orshale—(howwellheatisconductedthroughamaterial)andheatingtrendsofthe4rocktypeswerestudied・Study1Fiftyholes,each().5macrossand20mdeep,weredugintoeachofthefollowing:arocksaltdeposit,granitebedrock,basaltbedrock,andshalebedrock・,alongwiththetypicalthermalconductivityofeachrocktype,inWattspermeterper°C(W/m°C),at25°,(W/m°C)Rocktemperature(°C)**A11rocktypeshadaninitialtemperatureof10°°Cand400°C・ rocksalt400FigureI granite basalt shalea_O5-A、、、、4□、、•>■ — \—二•二二. 1-n10100 200 300temperature(°C)Study3Thescientistscalculatedthetemperatureincreasethatwouldb