Change the chapter
For the experiment that you devised Example 14.1, which variables can be changed, and how should they be changed, so as to shorten the time in which a measurement is made?
  1. Use a smaller quantity of ice (smaller m).
  2. Use containers with greater thickness (larger d).
  3. Use containers with smaller surface areas (smaller A).
  4. Use a lower ambient temperature outside the container (smaller T2).
Question by OpenStax is licensed under CC BY 4.0.
Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 14, Problem 5 (Test Prep for AP® Courses) (1:36)

Sign up to view this solution video!


No votes have been submitted yet.

Quiz Mode

Why is this button here? Quiz Mode is a chance to try solving the problem first on your own before viewing the solution. One of the following will probably happen:

  1. You get the answer. Congratulations! It feels good! There might still be more to learn, and you might enjoy comparing your problem solving approach to the best practices demonstrated in the solution video.
  2. You don't get the answer. This is OK! In fact it's awesome, despite the difficult feelings you might have about it. When you don't get the answer, your mind is ready for learning. Think about how much you really want the solution! Your mind will gobble it up when it sees it. Attempting the problem is like trying to assemble the pieces of a puzzle. If you don't get the answer, the gaps in the puzzle are questions that are ready and searching to be filled. This is an active process, where your mind is turned on - learning will happen!
If you wish to show the answer immediately without having to click "Reveal Answer", you may . Quiz Mode is disabled by default, but you can check the Enable Quiz Mode checkbox when editing your profile to re-enable it any time you want. College Physics Answers cares a lot about academic integrity. Quiz Mode is encouragement to use the solutions in a way that is most beneficial for your learning.

Video Transcript
This is College Physics Answers with Shaun Dychko. The formula for the rate of thermal conductivity through an object is its thermal conductivity of the material times the area of it. And then, times the temperature difference between one end and the other, and divided by the thickness through which this energy is meant to travel. So, we can compare these words with this formula to see which one, which words, correctly describe this formula. So, the rate increases with increased temperature, that's true, because as this difference goes up, then this will go up. And, surface area, yes, that too, eh? If you have area increasing, then you also will increase Q over T. And so, B is the correct answer. Well, I guess we can exclude the other ones if you like. So, the rate decreases with increased surface area. Well, that's the opposite of what we're seeing here. Rate increases with increased thickness, nu-uh. As this D goes up, as the denominator of a fraction increases, the quotient or the result of division decreases. So, having a bigger number in the bottom makes the result smaller. And so, that's the opposite of what this is saying here. The rate decreases with decreased temperature, that's true, actually. And increased surface area. Well, that's not true. So, the rate does not decrease with an increase in surface area. As A goes up, the rate goes up as well. So, B is the only correct answer.