Thermodynamics B/C

Locked
User avatar
JoeyC
Member
Member
Posts: 299
Joined: November 7th, 2017, 1:43 pm
Division: C
State: TX
Has thanked: 219 times
Been thanked: 29 times

Re: Thermodynamics B/C

Post by JoeyC » February 12th, 2019, 6:58 pm

Make sure to label! (almost lost points on that soon)
Ohayo!
Dynamic Planet, Protein Modeling, Fast Facts, Thermodynamics
Dynamic Planet, Machines, Ornith
1 Corinthians 13:4-7
Scientia Potentia Est
Has Gotten Coronavirus: No

RishithR
Member
Member
Posts: 3
Joined: December 9th, 2018, 2:22 pm
Has thanked: 0
Been thanked: 0

Re: Thermodynamics B/C

Post by RishithR » February 13th, 2019, 7:31 pm

Does K stay constant with a specific box?

UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 1523
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Has thanked: 0
Been thanked: 1 time

Re: Thermodynamics B/C

Post by UTF-8 U+6211 U+662F » February 13th, 2019, 7:49 pm

pigeon wrote:Does K stay constant with a specific box?
More or less

User avatar
CookiePie1
Member
Member
Posts: 372
Joined: February 15th, 2018, 5:05 pm
Division: C
State: NJ
Location: Am I here? Or there? Or both...?
Has thanked: 35 times
Been thanked: 10 times

Re: Thermodynamics B/C

Post by CookiePie1 » February 13th, 2019, 8:06 pm

UTF-8 U+6211 U+662F wrote:
pigeon wrote:Does K stay constant with a specific box?
More or less
Not really - devices don't retain heat as well when volumes are altered, so k-values for lower volumes are generally worse than those for higher volumes. k-values should only be compared within their own volume ranges.
South Brunswick High School Captain '22
2020 Events: Protein Modeling, Ping Pong Parachute, Wright Stuff, Sounds of Music

Reality is merely an illusion, albeit a very persistent one.
-Albert Einstein

Check out my userpage!

builder83
Member
Member
Posts: 178
Joined: September 7th, 2017, 4:41 pm
Has thanked: 0
Been thanked: 0

Charts

Post by builder83 » February 15th, 2019, 6:51 am

Just making sure I am getting my chart score perfect after reading this thread. I want to submit 4 or more time vs temp charts that can include 1 or more data series with 10 different temp readings per series. Label with units.

Also include a labeled picture diagram of box.

Question 2: Do you include a data series like at 56 or 58 degrees? (Assuming a 60 degree bath is used and the heat loss before I take my first reading.) Similarily do you bother with 75 degrees? (Division B)

User avatar
Crimesolver
Member
Member
Posts: 106
Joined: July 31st, 2018, 2:07 pm
Division: B
State: CA
Has thanked: 0
Been thanked: 0

Re: Charts

Post by Crimesolver » February 17th, 2019, 10:31 pm

builder83 wrote:Just making sure I am getting my chart score perfect after reading this thread. I want to submit 4 or more time vs temp charts that can include 1 or more data series with 10 different temp readings per series. Label with units.

Also include a labeled picture diagram of box.

Question 2: Do you include a data series like at 56 or 58 degrees? (Assuming a 60 degree bath is used and the heat loss before I take my first reading.) Similarily do you bother with 75 degrees? (Division B)
Is the first one a question or a clarification?????? Yeah those are the parameters. To your second question, yes. You have to start whenever the thermometer hits the water and start timing from there. For 75 degrees, you would just heat the water to 75 degrees, then pour it in the beaker and measure for how long you need to.
cerritos/great oak/SOLVI/poly/wilson/r/s(!) (well this sucks)
detector: 1/2/1/12/27/1/
machines: 13/10/9/10/3/10/
sounds: 26/15/13/12/3/7/
gravity: 11/8/3/6/9/8/
circuits: 12/2/9/12/6/10/
Keep on going :)

User avatar
Crimesolver
Member
Member
Posts: 106
Joined: July 31st, 2018, 2:07 pm
Division: B
State: CA
Has thanked: 0
Been thanked: 0

Re: Thermodynamics B/C

Post by Crimesolver » February 17th, 2019, 10:35 pm

Science Olympiad wrote:Heat Score (HS) = 20 x (lowest k of all teams)(the k value closest to zero of all teams) / k, where k is from Newton’s law of cooling: k = - (1 / cooling time) x ln((start water temp - room temp) / (final water temp - room temp))
Has anyone noticed this clarification? Just figured this out today. Does anyone know if recent competitions have been using this questions instead of the previous one?
cerritos/great oak/SOLVI/poly/wilson/r/s(!) (well this sucks)
detector: 1/2/1/12/27/1/
machines: 13/10/9/10/3/10/
sounds: 26/15/13/12/3/7/
gravity: 11/8/3/6/9/8/
circuits: 12/2/9/12/6/10/
Keep on going :)

chalker
Member
Member
Posts: 2104
Joined: January 9th, 2009, 7:30 pm
Division: Grad
State: OH
Has thanked: 1 time
Been thanked: 40 times

Re: Thermodynamics B/C

Post by chalker » February 19th, 2019, 4:41 pm

Crimesolver wrote:
Science Olympiad wrote:Heat Score (HS) = 20 x (lowest k of all teams)(the k value closest to zero of all teams) / k, where k is from Newton’s law of cooling: k = - (1 / cooling time) x ln((start water temp - room temp) / (final water temp - room temp))
Has anyone noticed this clarification? Just figured this out today. Does anyone know if recent competitions have been using this questions instead of the previous one?
This doesn't really impact anything. The official spreadsheet was already calculating this correctly. We previously said 'smallest', but due to the fact k is negative smallest technically is 'most negative'. However, anyone running the event would obviously know the objective it to retain the MOST heat, not LOSE the most heat, which is what you'd have to do to get a really large negative k value.

Student Alumni
National Event Supervisor
National Physical Sciences Rules Committee Chair

User avatar
JoeyC
Member
Member
Posts: 299
Joined: November 7th, 2017, 1:43 pm
Division: C
State: TX
Has thanked: 219 times
Been thanked: 29 times

Re: Thermodynamics B/C

Post by JoeyC » February 20th, 2019, 12:01 pm

Yeah, as long as the ES's know how the k value correlates with heat retention, it should be fine.
Ohayo!
Dynamic Planet, Protein Modeling, Fast Facts, Thermodynamics
Dynamic Planet, Machines, Ornith
1 Corinthians 13:4-7
Scientia Potentia Est
Has Gotten Coronavirus: No

mjcox2000
Member
Member
Posts: 121
Joined: May 9th, 2014, 3:34 am
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Thermodynamics B/C

Post by mjcox2000 » February 20th, 2019, 12:41 pm

It seems to me like it's not an issue of retaining vs. losing heat, but rather an issue of the range of scores. Supposing the worst team had a k of 1.0 and the best had a k of 0.01: under the rules as written, the worst team would get 20 points and the best team 2,000, while the clarification makes it so the worst team gets 0.2 points and the best team 20. In both cases, the best team gets more points and the worst team gets fewer. It's just a question of whether scores should be in the range (0 .. 20) or the range (20 .. infinity).
MIT ‘23
TJHSST ‘19
Longfellow MS

See my user page for nationals medals and event supervising experience.

Locked

Return to “Thermodynamics B/C”

Who is online

Users browsing this forum: No registered users and 3 guests