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#1 2007-05-28 03:12:13

0001T
Member
Registered: 2007-03-28
Posts: 4

help....

i am trying to solve this [t is time and T is temperature] to find the time t,


         6450*Pi*(0.00185^2)*(0.0625)*836
dt = ---------------------------------------------   dT
        (1.2^2)*7.5 - 108*Pi*0.00185*0.25*T


between the limits 0 and 180degC

can someone help me:D

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#2 2007-05-30 14:31:47

John E. Franklin
Member
Registered: 2005-08-29
Posts: 3,588

Re: help....

Integrate 23.0917 / (68.824 - T)       dT.
Wolfram's integrator says:
-23.0917 ln(68.824 - T), but when you substitute 180 and 0, you get a math error because
the natural log of a negative number is impossible to do.


igloo myrtilles fourmis

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