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Learner1
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#1
Report Thread starter 16 years ago
#1
Hello, I am stuck on this question

if the temperature = 20 + 80e^-0.1t, find in t in terms of temperature and find the time at which 1) temperature = 60 c 2) 20 c

t = time

x
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Nylex
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#2
Report 16 years ago
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60 = 20 + 80e^-0.1t

Take logs of both sides:

ln 60 = ln 20 - 0.8t

0.8t = ln 20 - ln 60

t = (1/0.8)(ln 20 - ln 60)

I think that's right.
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iiikewldude
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i hope this is uni stuff and not a level, far too hard for me.
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Learner1
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#4
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(Original post by iiikewldude)
i hope this is uni stuff and not a level, far too hard for me.

Yea its applied maths
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cobra
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we did stuff like that at A level
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fishpaste
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Basic AS level, never mind Alevel.
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Jonatan
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#7
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(Original post by iiikewldude)
i hope this is uni stuff and not a level, far too hard for me.
We did a question just like that in IB. And it was regarded a simpl,e question. I think this is A level syllabus, specially if you take further maths...
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Learner1
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(Original post by Jonatan)
We did a question just like that in IB. And it was regarded a simpl,e question. I think this is A level syllabus, specially if you take further maths...

Yea I was just playing, It is a -level maths really, not sure if it is uni stuff
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Michael Beaver
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(Original post by fishpaste)
Basic AS level, never mind Alevel.
GCSE or SATS I reckon
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fishpaste
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(Original post by Jonatan)
We did a question just like that in IB. And it was regarded a simpl,e question. I think this is A level syllabus, specially if you take further maths...
No, it's like the second pure module in alevel maths, very basic stuff. The alevel isn't THAT easy =P I think it might be pure1 on the irish board too.
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