## Lesson 10: Part 9 (Problem Solving Cooldown)

BusyBeeh
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### Lesson 10: Part 9 (Problem Solving Cooldown)

Hello,

I noticed one of the questions in the problem solving cool-down (Question#23, pg 278 in coursebook) was not addressed in the video rather another question regarding q=mCdelta(T) was. Here's the question:

23. A research team wishes to investigate the nighttime temperatures on both cloudy nights and clear nights. The data are expected to show:
a. temperatures recorded on cloudy nights will be higher
b. temperatures recorded on clear nights will be higher
c. temperatures recorded will be random
d. the temperatures recorded will be the same.

I chose answer C. Can someone please elaborate on what the correct answer is along with an explanation?

Thank you.
"Develop success from failures. Discouragement and failure are two of the surest stepping stones to success." ~Dale Carnegie
NS_Tutor_Andrew
Posts: 520
Joined: Mon May 23, 2016 1:47 pm

### Re: Lesson 10: Part 9 (Problem Solving Cooldown)

Hi BusyBeeh,

Thanks for the question - we'll definitely plan on fixing the course book to make it agree with the video. The reason why we swapped out this question is that it tests the same concept that is tested on Q23 -- namely that a cloud layer at night provides a layer of insulation. A simple explanation of this can be found here. Therefore, the correct answer to this question will be A. (To clarify, the wording is designed to imply that this is an average measurement -- obviously some cloudy nights will be cooler than some clear nights, especially if you have measurement points in different seasons, but overall, clouds will tend to insulate the ground and prevent heat loss).

Hope this helps!
Andrew D.
Content Manager, Next Step Test Prep.
BusyBeeh
Posts: 42
Joined: Sun Apr 09, 2017 4:47 pm
Location: SoCal
Contact:

### Re: Lesson 10: Part 9 (Problem Solving Cooldown)

Makes sense, thank you Andrew!

NS_Tutor_Andrew wrote:Hi BusyBeeh,

Thanks for the question - we'll definitely plan on fixing the course book to make it agree with the video. The reason why we swapped out this question is that it tests the same concept that is tested on Q23 -- namely that a cloud layer at night provides a layer of insulation. A simple explanation of this can be found here. Therefore, the correct answer to this question will be A. (To clarify, the wording is designed to imply that this is an average measurement -- obviously some cloudy nights will be cooler than some clear nights, especially if you have measurement points in different seasons, but overall, clouds will tend to insulate the ground and prevent heat loss).

Hope this helps!
"Develop success from failures. Discouragement and failure are two of the surest stepping stones to success." ~Dale Carnegie
NS_Tutor_Andrew