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holtadit:
2007 winter paper 6

Question 1 c  i


Please explain the answer - MS is useless

haris94:
yes, answer does support the theory

at the start, the temperature of the water is 68
suppose room temperature is 25
the difference is 43

now in the final minute, the temperature of the water is 29
the difference in temp between the water and room temperature is now only 5

your answers of t1 and t2 in b part prove the above

so the theory "rate of cooling of the hot water at any time depends on the difference between the temperature of the water at that time and room temperature" is right according to the answer

SEL123:
So you know that room temperature is about 27 C right?
At 0 seconds, the temperature is 68, then at 20 its 53
There's a temperature difference of 15 degrees
68 degrees is very far from the room temperature, so the change in the next 30 seconds is very large

But as the temperature gets closer to room temperature, the change is less.Eg:

At 270 seconds, the temperature was 28.5
At 300, its at 28
The increase is only 0.5

holtadit:

--- Quote from: haris94 on May 10, 2010, 07:03:39 am ---yes, answer does support the theory

at the start, the temperature of the water is 68
suppose room temperature is 25
the difference is 43

now in the final minute, the temperature of the water is 29
the difference in temp between the water and room temperature is now only 5

your answers of t1 and t2 in b part prove the above
so theory is right according to the answer

--- End quote ---

So the greater the difference between room temp. and the temp. of the water the GREATER THE RATE OF COOLING ?

thenewkid™:

--- Quote ---Alright I'm trying it now..


Can you re-explain that?
I didn't reallly get it...
--- End quote ---

hope this is correct

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