Machines B/C

Test your knowledge of various Science Olympiad events.
User avatar
JoeyC
Member
Member
Posts: 269
Joined: November 7th, 2017, 1:43 pm
Division: C
State: TX

Re: Machines B/C

Post by JoeyC » September 29th, 2019, 5:42 am

Given that a #7-32-5 (UNF) screw is being turned with a 5 inch long wrench, what is the IMA of the action?
Ohayo!
Dynamic Planet, Protein Modeling, Fast Facts, Thermodynamics
Dynamic Planet, Machines, Ornith
1 Corinthians 13:4-7
Scientia Potentia Est

User avatar
viditpok
Member
Member
Posts: 12
Joined: August 31st, 2018, 2:29 pm
Division: C
State: FL

Re: Machines B/C

Post by viditpok » October 9th, 2019, 7:11 pm

JoeyC wrote:
September 29th, 2019, 5:42 am
Given that a #7-32-5 (UNF) screw is being turned with a 5 inch long wrench, what is the IMA of the action?
I don't understand the #7-32-5 thing, as when I was looking it up, most results showed 7/32-5/8" or something close to it. Could you please describe what it means?
Orlando Science High School '22
2017-18 Events: Thermodynamics, Crime Busters, Hovercraft, Optics
2018-19 Events: Circuit Lab, Fermi Questions, Forensics, Mission Possible
2019-20 Events: Circuit Lab, Machines, Codebusters

User avatar
JoeyC
Member
Member
Posts: 269
Joined: November 7th, 2017, 1:43 pm
Division: C
State: TX

Re: Machines B/C

Post by JoeyC » October 10th, 2019, 5:16 pm

This can help
https://www.hunker.com/12420308/how-to-read-screw-sizes
The #7-32-5 is a unified screw read out, and works like this-
diameter - number of threads per inch - length of screw
Because it's in unified, all units are in inches, and importantly the diameter has an octothorpe (#) in front of it.
This means that the diameter is not 7 inches, but dictated by this formula,
.06+.013*n, where n is the number. So the diameter is .151 inches, there are 32 threads per inch, meaning pitch (important for screw IMA) is .03125, and the screw is 5 inches long.
Using this information, I can use the Screw IMA equation ; IMA = 2pir/p, or IMA = circumference of total effort arm over pitch, the effort arm being 5 inches because my wrench, effort arm, is 5 inches long, and pitch being 1/32, or .03125.
IMA = 1005.30964915
Ohayo!
Dynamic Planet, Protein Modeling, Fast Facts, Thermodynamics
Dynamic Planet, Machines, Ornith
1 Corinthians 13:4-7
Scientia Potentia Est

User avatar
viditpok
Member
Member
Posts: 12
Joined: August 31st, 2018, 2:29 pm
Division: C
State: FL

Re: Machines B/C

Post by viditpok » October 11th, 2019, 7:05 am

Oh, that makes so much more sense
Thank you so much for the help!
Orlando Science High School '22
2017-18 Events: Thermodynamics, Crime Busters, Hovercraft, Optics
2018-19 Events: Circuit Lab, Fermi Questions, Forensics, Mission Possible
2019-20 Events: Circuit Lab, Machines, Codebusters

AlfWeg
Member
Member
Posts: 96
Joined: July 22nd, 2019, 7:52 am
Division: C
State: MI

Re: Machines B/C

Post by AlfWeg » October 13th, 2019, 6:03 pm

Who's next? @JoeyC
Last&SeventhYearOlympian
NorView/CenterVille/UMICH/r/s:
Machines: 2/4/1
DP: 1/1/7
Code:X/16/9
GeoMap:X/9/8
Protein: 2/X/X
It's kinda Dull -->AlfWeg's Userpage

User avatar
JoeyC
Member
Member
Posts: 269
Joined: November 7th, 2017, 1:43 pm
Division: C
State: TX

Re: Machines B/C

Post by JoeyC » October 13th, 2019, 6:22 pm

Anyone else I guess?
Alf you can do it if you want.
Ohayo!
Dynamic Planet, Protein Modeling, Fast Facts, Thermodynamics
Dynamic Planet, Machines, Ornith
1 Corinthians 13:4-7
Scientia Potentia Est

AlfWeg
Member
Member
Posts: 96
Joined: July 22nd, 2019, 7:52 am
Division: C
State: MI

Re: Machines B/C

Post by AlfWeg » October 14th, 2019, 3:07 am

JoeyC wrote:
October 13th, 2019, 6:22 pm
Anyone else I guess?
Alf you can do it if you want.
Naw :D
Last&SeventhYearOlympian
NorView/CenterVille/UMICH/r/s:
Machines: 2/4/1
DP: 1/1/7
Code:X/16/9
GeoMap:X/9/8
Protein: 2/X/X
It's kinda Dull -->AlfWeg's Userpage

User avatar
Creationist127
Member
Member
Posts: 69
Joined: August 14th, 2018, 3:21 pm
Division: C
State: IN
Location: The Wild Area

Re: Machines B/C

Post by Creationist127 » October 14th, 2019, 7:05 am

I'll just go.
There is an inclined plane, with a 26.0* angle of incline. On top of it is a 25.0 kg box, on the cusp of moving. What is the coefficient of static friction between the ramp and the box, and what is the force of friction?
2018: Hovercraft, Thermo, Coaster, Solar System
2019: Thermo, Circuit Lab, Sounds, Wright Stuff
2020: Circuit Lab, WIDI, Wright Stuff, Machines

It's not science if you don't glue your hand to it at least three times.

Umaroth
Member
Member
Posts: 189
Joined: February 10th, 2018, 8:51 pm
Division: C
State: CA
Location: Kraemer Room 504, Troy Room 909, or studying at my dining table

Re: Machines B/C

Post by Umaroth » October 14th, 2019, 7:37 am

Creationist127 wrote:
October 14th, 2019, 7:05 am
I'll just go.
There is an inclined plane, with a 26.0* angle of incline. On top of it is a 25.0 kg box, on the cusp of moving. What is the coefficient of static friction between the ramp and the box, and what is the force of friction?
mgsinθ = μmgcosθ
μ = sin26/cos26 = tan26
μ = 0.488

F = μmgcosθ
F = 107N
Troy SciOly 2019-present
The Ambassador
Kraemer SciOly Padre 2018-present
Dank Memes Area Homeschool Juggernaut 2018-present
Kraemer SciOly Pretty-Much Head Coach 2019-present
2020 Tryouts: Circuit, Code, Detector, DP, GeoMaps, Machines
Regionals and GGSO Events: Code, Detector, DP

Umaroth's Userpage

User avatar
Creationist127
Member
Member
Posts: 69
Joined: August 14th, 2018, 3:21 pm
Division: C
State: IN
Location: The Wild Area

Re: Machines B/C

Post by Creationist127 » October 14th, 2019, 9:04 am

Umaroth wrote:
October 14th, 2019, 7:37 am
Creationist127 wrote:
October 14th, 2019, 7:05 am
I'll just go.
There is an inclined plane, with a 26.0* angle of incline. On top of it is a 25.0 kg box, on the cusp of moving. What is the coefficient of static friction between the ramp and the box, and what is the force of friction?
mgsinθ = μmgcosθ
μ = sin26/cos26 = tan26
μ = 0.488

F = μmgcosθ
F = 107N
Correct! Your turn.
2018: Hovercraft, Thermo, Coaster, Solar System
2019: Thermo, Circuit Lab, Sounds, Wright Stuff
2020: Circuit Lab, WIDI, Wright Stuff, Machines

It's not science if you don't glue your hand to it at least three times.

Post Reply

Return to “Question Marathons”

Who is online

Users browsing this forum: No registered users and 1 guest