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by windu34
September 18th, 2019, 8:57 pm
Forum: Alumni
Topic: Test writing
Replies: 20
Views: 2452

Re: Test writing

If I'm writing fossils, I generally take forever because I'll be combing our fossil collection for unique/interesting specimens to write questions on. Otherwise, 10-15 hours for a decent test is pretty standard. For higher-tier invites/competitions, I will generally take more time to double check t...
by windu34
September 18th, 2019, 9:00 am
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

You could also use springs and store the additional energy in that. Is there a way to use a spring to slow down the progress of the wingnut across the threaded rod without locking it up? I'm just thinking, if you don't use two springs, or even if you do, one is bound to be marginally stronger than ...
by windu34
September 15th, 2019, 5:09 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

So yes, if you look at the Vehicle as a closed system, at the end of the run, kinetic energy has to be 0. If you haven't stored any of that kinetic energy in something (like elastic or gravitational potential), then it all must have been dissipated as heat by your brakes. Actually, magnets might (e...
by windu34
September 15th, 2019, 12:01 am
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

This brings up an interesting point of discussion: would it be possible to move the center of mass during the run of your vehicle? In the ready to run position, Id estimate wanting about 90% of the mass in the rear, but after the vehicle has descended down the ramp, it is more advantageous to have ...
by windu34
September 11th, 2019, 9:43 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

I don't know if this is appropriate to put here but I wanted to get other's opinions on this: Why would they make the distance so long? 12 meters?!?! This may be unique to my situation but the way our team does building events is the kids do it 99% at home. Most building and testing time is done on...
by windu34
September 11th, 2019, 8:02 am
Forum: Lab Events
Topic: Circuit Lab B/C
Replies: 21
Views: 1880

Re: Circuit Lab B/C

I have a few questions regarding the Circuit Lab test for C division. What types of capacitors will we need to know about? Is it just parallel plate capacitors or also cylindrical, spherical, etc.? What do we need to know regarding AC Circuits? Will we be asked to do calculations on AC Circuits reg...
by windu34
September 10th, 2019, 5:51 pm
Forum: Regionals & States
Topic: Florida 2020
Replies: 8
Views: 687

Re: Florida 2020

First of all, good luck everyone this year. It will be an exciting year with all the changes. As for OSS Invitationals, we will have two Division B competitions as well as a Division C invitational. Dates for Div B are October 19th and December 14th Date of Div C Invitational is November 14th. Stat...
by windu34
September 10th, 2019, 5:51 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

What's the legality on this, given the phrase in 3.g. "All parts of the Vehicle must move as a whole"? That's a curious phrase - "move as a whole" isn't very well defined. The next clause talks about no anchors or tethers, so I'd interpret that to mean "everything has to stay with the car" but I wo...
by windu34
September 9th, 2019, 6:56 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

This brings up an interesting point of discussion: would it be possible to move the center of mass during the run of your vehicle? In the ready to run position, Id estimate wanting about 90% of the mass in the rear, but after the vehicle has descended down the ramp, it is more advantageous to have ...
by windu34
September 8th, 2019, 11:09 pm
Forum: Gravity Vehicle C
Topic: Gravity Vehicle C
Replies: 122
Views: 5589

Re: Gravity Vehicle C

Do you think there is any best size for the car to be? Old pictures seem to indicate a wide variety of dimensions. Some covered the whole ramp and others were probably not even 25 cm long. I believe any size vehicle has the ability to work out well, but personally I think bigger cars are the way to...

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