- #1
PlasmaSphere
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Homework Statement
The temparature T of a liquid at a time t minutes is given by the equation
T = 30 + 20e-0.05t, for t > 0
(1)Write down the initial tempatature o the liquid, and find the intial rate of change of temparature.
(2)Find the time at which the temparature is 40
Homework Equations
The Attempt at a Solution
When t=0 the initial temparture is 50. I know that to have to find dT/dt, and i and looked at the answer, which says dT/dt = -0.05 x 20e-0.05t, but i can't see how they got that. what happened to the 30? and how did they get to that point?