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A piece of metal with a mass of 1.9 kg, specific
heat of 200 J/kg

C, and initial temperature
of 100

C is dropped into an insulated jar that
contains liquid with a mass of 3.9 kg, specific
heat of 1000 J/kg

C, and initial temperature
of 0

C. The piece of metal is removed after
7 s, at which time its temperature is 20

Find the temperature of the liquid after the
metal is removed. Neglect any effects of heat
transfer to the air or to the insulated jar.
Answer in units of


  • physics -

    the sum of the heats gained is zero.

    solve for Tf

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