# physics/mathsWatch

Announcements
This discussion is closed.
#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
0
16 years ago
#2
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.
0
16 years ago
#3
i hope this is uni stuff and not a level, far too hard for me.
0
#4
(Original post by iiikewldude)
i hope this is uni stuff and not a level, far too hard for me.

Yea its applied maths
0
16 years ago
#5
we did stuff like that at A level
0
16 years ago
#6
Basic AS level, never mind Alevel.
0
16 years ago
#7
(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...
0
#8
(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
0
16 years ago
#9
(Original post by fishpaste)
Basic AS level, never mind Alevel.
GCSE or SATS I reckon
0
16 years ago
#10
(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.
0
X
new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

Yes (476)
66.57%
No (239)
33.43%