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Physics 16 Online
jennylove:

A 0.20 kg block of a substance requires 3.59 kJ of heat to raise its temperature by 20 K. Use the table to identify the substance. copper aluminum gold iron Substance C[ J/g.C∘ ] C[ J/g.K ] water(ice) 2.05 2,060 iron 0.46 450 aluminum 0.90 897 gold 0.13 130 copper 0.39 285 silver 0.24 235 ammonia(liquid) 4.70 4,700 water(liquid) 4.18 4,180 water(liquid) 2.08 2,020 lead 0.13 128

jennylove:

Substance C[ J/g.C∘ ] C[ J/g.K ] water(ice) 2.05 2,060 iron 0.46 450 aluminum 0.90 897 gold 0.13 130 copper 0.39 285 silver 0.24 235 ammonia(liquid) 4.70 4,700 water(liquid) 4.18 4,180 water(liquid) 2.08 2,020 lead 0.13 128

jennylove:

here is the table better written out , sorry about that.

jennylove:

i think the answer would be aluminum?

justjm:

You seem correct, but is the table in J/kg K? Then that would make better sense.

jennylove:

i think the right side is J/kg right?

justjm:

yeah me too.

justjm:

possibly an error on their end

jennylove:

like for water it would be 2,060 ?

jennylove:

maybe so , im not quite sure

justjm:

yeah they wrote it wrong. It should be kg, other wise in their units it would be 0.8975 J/gK

jennylove:

that would only make sense, alright ill go with aluminum, thank you.

justjm:

np

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