Newton Law of Cooling

[believe_in_you]

Two equation are used for two different condition  for a temperature in the room
(1) T = 15e^(-0.3662t) + 5

(2) T = -6.848e^(-0.3662t) + 26.848

If the heating on, equation 2 applied and equa 1 if the heating is off.

The T (temperature) inside the greenhouse starts to fall until it reaches 15 C, when the heating automatically switches on and remains on until temperature reaches 17 C. The heating then switches off and the temperature falls until it reaches 15 C when again the heating is on and remain until T reaches 17 . and so on.
Sketch the graph for 0<t<12

This confusing !!!!

[sachinmachin]

Two equation are used for two different condition  for a temperature in the room
(1) T = 15e^(-0.3662t) + 5

(2) T = -6.848e^(-0.3662t) + 26.848

If the heating on, equation 2 applied and equa 1 if the heating is off.

The T (temperature) inside the greenhouse starts to fall until it reaches 15 C, when the heating automatically switches on and remains on until temperature reaches 17 C. The heating then switches off and the temperature falls until it reaches 15 C when again the heating is on and remain until T reaches 17 . and so on.
Sketch the graph for 0<t<12

This confusing !!!!

dude relax.
although it seems lyk a difficult sac task, im sure nothing like that will be on the exam.
although it would be helpful to know how you would sketch the graph.
is it addition of ordinates?? and then you use the 'T' values given to find specific times on the graph??

[believe_in_you]

That cool
it just out of my interest LOL
I dont try to cheat here lol. our SAC already finished. I just want to know if anyone got any idea

[believe_in_you]

I thought of using the addition. But it cant be used in this case
What i did is I worked out the diffrence of t (time ) taken for equa 2 to go from 15 to 17 C.
and time for equa 1 to go from 17 down to 15 and just repeat these until t = 12

[GerrySly]

I dont try to cheat here lol. our SAC already finished. I just want to know if anyone got any idea

That other thread that I posted in you were trying to get answers to your SAC...

[believe_in_you]

lol. i know

[believe_in_you]

dude relax.
although it seems lyk a difficult sac task, im sure nothing like that will be on the exam.
although it would be helpful to know how you would sketch the graph.
is it addition of ordinates?? and then you use the 'T' values given to find specific times on the graph??
[/quote]

LOL, if you wanna know how to work out that question.
I will post it up next term when I have my SAC back
^^