Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

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

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

Offline

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

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**

Offline