physics
posted by Josh .
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
◦
C.
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
◦
C

the sum of the heats gained is zero.
massmetal*cmetal(20100)+massliquid*cliquid(Tf0)=0
solve for Tf