Answer:
a) 35 s
b) 39 s
Explanation:
Initial temperature Ā Tā= 20 Ā°C
Final temperature Tā= 90 Ā°C
Temperature rise rate = 2 Ā°C/s
To solve the problem we can use the formula Tā + t * 2Ā°C/s = Tā
Where t is the time, in seconds.
We solve for t :
20Ā°C + t * 2Ā°C/s = 90Ā°C
t * 2Ā°C/s = 70Ā°C
t Ā = 35 s
- We use the same formula in order to solve the second question, keeping in mind that in this case Tā= 98 Ā°C:
20Ā°C + t * 2Ā°C/s = 98Ā°C
t * 2Ā°C/s = 78Ā°C
t Ā = 39 s
