A child complains that her milk is too hot. It is indeed too hot at 90 Celsius.?

[Something T]

A child complains that her milk is too hot. It is indeed too hot at 90 Celsius. her mother pours 80 g of cold milk at 7 Celsius to the 160 g milk already in the cup. If the specific heart capacity of milk is 3800 J.kg^-1.K^-1, what is the temperature of the mixture now?

 

[ces]

they are in thermal equilibrium

 

[T.J.]

t1 = 90 C
t_milk = 7 C
t2 = ?

m_cold = 0.08 kg
m_hot 0.16 kg

shc = 3800 J.kg^-1.K^-1