Conglomeration of Random Questions

[BlasianAsian]

Oh. I thought you meant the TI-84. Nvm...

[Shawn]

[BlasianAsian]

Ok. I got a question asking me to multiply 2 - 2 by 2 matrices together, and finding the determinant of that.

That sounds like that's gonna take at least 5 min...

Any tips to speed up the process?

EDIT: 2010 Invatational Test B

47) Moore's Law predicts that the number of transistors on a circuit board doubles every two years. In 1971, the count was 2300. In 1981, it was 100,000; in 1990 it was 1000000; in 2008 it was 1.5 billion. Based on this data, what is the actual time for doubling the number of transistors?

Answer: [unparseable or potentially dangerous latex formula]

I know how to do Best-Fit lines and stuff, but I feel that last sentence threw me off...

[Shawn]

[BlasianAsian]

Yeah, but the variables were in the matricies, and they were asking to find what the variable was if the determinant of the multiplied together matrix was 25.

Anyways....

Mas Problemas:

2009 District Week 2 Test

17) Don breathes 22 times every minute, and his rest pulse is 64 beats per minute. How long does it take for his heart to beat 1000 times more than the number of breaths he took in the same time interval?

Answer: [unparseable or potentially dangerous latex formula] HOURS

36) In an egg toss, a strategy is to throw the egg with the lowest possible velocity, but still cover the distance to the catcher. If the catcher is 25 ft from the thrower, what is this velocity?

Answer: [unparseable or potentially dangerous latex formula]

38) During a footrace, a fast runner runs at a 6 min/mi pace, and a slow runner runs at a 7 min/mi pace. The fast runner passes the slow runner. After a 2 sec delay, the slow runner initiates an acceleration, catching up with the fast runner in 968 ft. What is this acceleration?

Answer: [unparseable or potentially dangerous latex formula] ft/sec

[Shawn]

Ok, so what I would suggest if 89 is just add equation solve to that, if not than you can still do it by hand, and just use systems. On 84 can you get an algebraic result? I will answer some more tommorrow.

[007math]

[FabensMath]

17. 22x=64x-1000 solve, giving you x=23.8095min=.397hr.

[FabensMath]

38 is from the study list, check the thread on a previous topic.

[007math]

[BlasianAsian]

Oh my god oh my god oh my god. I think I just figured out why I miss like 3/4 of these physics problems. They imply things? Like the 45 degree maximum angle thing?

I KNOW the formula. It's like INGRAINED into my head. But there's always that one thing... *ARRRRRRRRRRRRRRRRRRGGGGGGG* *cries*

Ok, are there ANY constants and implyed things that you HAVE TO KNOW, such as the 45 degree thingamabob.

Ok, I'll check the study list!

Thanks!

Wow...why does everything look so much easier after I put it up... must be the giant txt block on those old tests...yes...I blame it there...

[007math]

I really do feel seeing a bunch of text is intimidating, since I feel the same as you. Argh, I wish I could answer the questions like I am now on the actual contest...I fail in competition.

[BlasianAsian]

LoL I know right? I look back at my Distric Test now and I'm just like, seriously?

BTW, do you have any tips for dealing with physics problems? I'm not in physics...that's probably the root of the problem, lol.

[007math]

Honestly, I skip pretty much all the physics problems. Only now, while doing them here, do I realize they are not bad at all. I assume all physics problems are time consuming.....

If you don't know physics, then I wouldn't worry about them unless the other questions you cannot do are just insanely hard. Then again, that's my opinion...

[BlasianAsian]

Oh...ok. I gotta remember that 45 degree angle thing...

[Shawn]

2009 D2
38)
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
I guess I did something wrong, I don't know what though. Or the key is wrong.

[BlasianAsian]

IDK. The 1st half of your explanation makes sense. After that, though, you lost me. Or maybe I gave the wrong answer... Lemme go check...