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Question 02 (a) 

FullSolution Problems. In questions 28, justify your answers and show all your work. If a box is provided, write your final answer there. Simplification of answers is not required unless explicitly requested. When an apple is taken from a refrigerator, its temperature is . After 30 minutes in a room, its temperature is . Assuming that the temperature of the apple satisfies Newton's Law of Cooling, write the differential equation satisfied by the temperature of the apple at time t. 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

What's the only differential equation you know from this course? 
Checking a solution serves two purposes: helping you if, after having used the hint, you still are stuck on the problem; or if you have solved the problem and would like to check your work.

Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. This one you just have to know by heart for the exam.
