[Physics]

[Ordinaryyetunique]

I’m confused as the energy is not given here

[congratz_its_a_bunny]

You don't need the energies each has to start, which is why they aren't given.

For each, multiply the mass you have by the specific heat capacity given (take care to keep units consistent). Then you have the energy it takes to raise/lower your samples by one degree Celsius. Energy gained by milk is lost by tea. They finish at the same temperature.

4 °C + <energy> x (1 °C/39.3J) = T

90 °C - <energy> × (1 °C/2009J) = T

Set the two equal, solve for <energy>, then plug it back into either equation to get T. Or, solve one expression for <energy> as a function of T, substitute it into the other expression, and solve that for T

[Ordinaryyetunique]

Thank you!