Refrigerator problem

Wrong! The question on the site was ... if you have a fridge with it’s door closed in a room -after a long time the temperatures stabilises. If you then open the door and the temperature stabilises will the room be warmer or colder than when the door was closed? The answer that the problem suggests is that the temperature will be the same. (I assume this is because the fridge is pumping heat from the room - to the room.

My answer was that the room will be colder and this was called WRONG. I assume the room is thermally insulated, the fridge closed and let’s say that the fridge was 0 deg C and the room 20deg C and the total volume of the room 10x that of the fridge. With the fridge door open and temperature stabilised the temperature of the room will be 18deg C. .... closed. (20x9) + (0x1) Open. 18x10 This is the first look at - this was Avery simple test - I can understand the concepts. When I find a more challenging test that I don’t fully understand I will not be able to trust the explanations.

I found this site after watching a great Utube vid Called ‘the hardest problem on the hardest test’ -

Note by Cc Usworth
3 years, 6 months ago

No vote yet
1 vote

  Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

  • Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
  • Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
  • Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
  • Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link]( link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 2×3 2 \times 3
2^{34} 234 2^{34}
a_{i-1} ai1 a_{i-1}
\frac{2}{3} 23 \frac{2}{3}
\sqrt{2} 2 \sqrt{2}
\sum_{i=1}^3 i=13 \sum_{i=1}^3
\sin \theta sinθ \sin \theta
\boxed{123} 123 \boxed{123}


There are no comments in this discussion.


Problem Loading...

Note Loading...

Set Loading...