TV Tropes Org

Forums

search forum titles
google site search
Total posts: [1,427]  1  2
3
 4  5  6  7  8 ... 58

Let's make a homework help thread!:

 51 Deboss, Thu, 19th Nov '09 12:43:41 AM from Awesomeville Texas
I see the Awesomeness.
Start with the angles. Once you have all the angles filled in, you can start applying the law of sines to get the distances. The angles determine the shape of the object and the ratios of the sides lengths, after that side m just gets you the scale. If you still have the issue tomorrow after noon, I'll try and add some stuff to help you along.

edited 19th Nov '09 1:13:39 AM by Deboss

 52 Ironeye, Thu, 19th Nov '09 2:29:59 AM from SoCal Relationship Status: Falling within your bell curve
Cutmaster-san
The issue in question is that there are not enough angle measurements (or, rather, not enough of the right ones) in order to determine the shape up to similarity (before we factor in the lengths). The angles we know are enough to determine triangle QRS, but they only give us one angle of PQS, which isn't enough to determine the angles of that triangle. Getting any one angle more (other than angle RQS or angle PSQ—or of the angles that are obviously 180 degrees, of course) would actually give us enough information. So would some of the side lengths. As it stands, though, these for pieces of information are not enough to determine a unique quadrilateral.
I'm bad, and that's good. I will never be good, and that's not bad. There's no one I'd rather be than me.
 53 Deboss, Thu, 19th Nov '09 5:04:16 AM from Awesomeville Texas
I see the Awesomeness.
I looked at in depth, and I'm going to have to agree. I only pulled another two angles out of it PSQ, and SQR. Unfortunately I'd need at least one more piece of data to finish this. I've done part of it, so if you want partial credit, I'll upload a shot of the scratch. Judging by the way it's asking for angle R when it gives us SRQ and the weirdness of the question I'm guessing they rearranged some of it and left a bit out. One more piece of data would make this solvable, any distance or an angle we don't have and that would be it.

Notes

edited 19th Nov '09 5:05:57 AM by Deboss

 54 Madrugada, Thu, 19th Nov '09 7:48:12 AM Relationship Status: In season
Zzzzzzzzzz
Are you supposed to presume that the angles at T are all right angles? and what's angle R? R and what other two points? Some piece of information is missing.
...if you don’t love you’re dead, and if you do, they’ll kill you for it.
 55 Deboss, Thu, 19th Nov '09 9:53:24 AM from Awesomeville Texas
I see the Awesomeness.
Yeah, that's what we noticed. Since it's asking for the upper angle T it's not right angles. We need another bit of data to pin the object down.
ALMSIVI
When I went into class today, I found out that she had indeed forgotten to give us an angle. Once I got it, it was so much easier. Thanks for trying to help, though.
I'm so sorry
So it's the teacher's fault. HAHA!
If you want me, i am still here. ElTheDaze@yahoo.com

ALMSIVI
Which is actually odd, because she's a pretty good teacher. Doesn't typically make mistakes like that.
I'm so sorry
I just like poking fun at teacher mistakes.tongue
If you want me, i am still here. ElTheDaze@yahoo.com

ALMSIVI
Ah. Yeah, I can understand that. I do that too, when it's a bad teacher.
I'm so sorry
I do it to my English teacher.

On another note, i have an essay due monday. Can anyone think of common themes between Psycho, The Birds, and Vertigo?
If you want me, i am still here. ElTheDaze@yahoo.com

ALMSIVI
Sorry, I haven't seen Psycho recently enough to talk about it and I've only seen the end of the Birds. And it was in Spanish.
I'm so sorry
ah, oh well.
If you want me, i am still here. ElTheDaze@yahoo.com

 64 Deboss, Thu, 19th Nov '09 2:25:12 PM from Awesomeville Texas
I see the Awesomeness.
She Failed a Spot Check, it happens. I haven't found a teacher yet who won't forget something or another. The principle was sound, yes?

Moving fast are we? The only thing I can think of between the three is that they're horror. You might want to look into why they're horror.

edited 19th Nov '09 2:27:01 PM by Deboss

ALMSIVI
If by that you mean I could figure it all out quite nicely with Law of Sines and Cosines once I had the angle, then yes.
 66 Deboss, Thu, 19th Nov '09 2:27:30 PM from Awesomeville Texas
I see the Awesomeness.
Yay, we were helpful.
 67 blackcat, Thu, 19th Nov '09 3:41:59 PM Relationship Status: A cockroach, nothing can kill it.
@ el the daze: Look at Wikipedia's article on Hitchcock for some ideas of where to start.
Love extends the boundaries of what people can accept, but don't depend on it.
 68 Schitzo, Fri, 20th Nov '09 11:45:36 PM from Akumajou Dracula Relationship Status: LA Woman, you're my woman
TvT
I'm now writing my essay on how physics apply to electric and acoustic guitars.

Yeah, yeah, soundwaves and vibrations and all that garbage. can anyone put it in layman's terms for me? I'm feeling kinda stupid right now.

@ El The Daze: for some odd reason, Hitchcock was a sucker for Blonds.

edited 20th Nov '09 11:46:55 PM by Schitzo

ALL CREATURE WILL DIE AND ALL THE THINGS WILL BE BROKEN. THAT'S THE LAW OF SAMURAI.
 69 Tzetze, Fri, 20th Nov '09 11:47:58 PM from a converted church in Venice, Italy
DUMB
  1. Pluck the string.
  2. String vibrates.
    • Depending on which fret, the length of the string that can vibrate increases or decreases.
  3. String causes air to vibrate.
    • Longer string (higher fret) = lower frequency = lower note, shorter string (lower fret) = higher frequency = higher note
  4. I know jack about amps
  5. Ear stuff

yeah tired whatever

edited 20th Nov '09 11:48:17 PM by Tzetze

Speaking of Sine and Cosine...

"Find the exact value of each expression. Do not use a calculator."

"csc 37° sec 53° - tan 53° cot 37°"

And "Express the exact value of each function as a single fraction. Do not use a calculator."

"If f(Θ)= 2 cos Θ - cos 2Θ, find f(π/6)."

This is the one time the book failed to explain anything it was asking... It doesn't even tell you how to figure out what the sin/cos/tan/etc. of a degree or radian is without using a calculator...

edited 21st Nov '09 8:25:28 AM by Miijhal

 
 71 Tangent 128, Sat, 21st Nov '09 1:23:04 PM from Virginia Relationship Status: I LOVE THIS DOCTOR!
dy/dx
For the first one, I'd start by just trying to simplify it...

Secant was 1/cosine, right? Then cosecant is 1/sine, I'm sine/cosine, and cotangent is cosine/sine.

edited 21st Nov '09 1:24:01 PM by Tangent128

Conversation is a contact sport.
 72 Tzetze, Sat, 21st Nov '09 1:24:21 PM from a converted church in Venice, Italy
DUMB
Well, tan x * cot x = 1, but I don't know how that works with different values.

And hell if I remember the half-angle identities. Damn those things.

[1]

edited 21st Nov '09 1:25:13 PM by Tzetze

 73 Ironeye, Sat, 21st Nov '09 4:18:54 PM from SoCal Relationship Status: Falling within your bell curve
Cutmaster-san
Alright, let's get you started with the unit circle. The x-coordinate correspond to the cos and the y-coordinate corresponds to the sin. If you have to evaluate any trigonometric function at one of the angles on the circle, write that function in terms of sin and cos, then plug in the values you get from the circle.

With the unit circle, the second question should be easy. In the first question, on the other hand, none of the angles correspond to those on the unit circle, so we'll have to perform some simplifications first.

First, go ahead and write all of the functions in terms of sin and cos, then write the entire expression one fraction. One thing we can notice is that 37=90-53, so we can write all of the functions that have 37 degrees in terms of (90-53) degrees. Since we know the double angle formulas for sin and cos, we can use those to get rid of all terms with 37 degrees. Remember to use the unit circle to evaluate sin(90) and cos(90)! At that point, your entire expression will be in terms of sin(53) and cos(53). Using some basic trig identities, (such as the Pythagorean identities), you should be able to reduce the expression into something that does not depend on sin(53) or cos (53) (since we don't know how to evaluate those, after all).

edited 21st Nov '09 4:19:19 PM by Ironeye

I'm bad, and that's good. I will never be good, and that's not bad. There's no one I'd rather be than me.
 74 Deboss, Sat, 21st Nov '09 8:08:12 PM from Awesomeville Texas
I see the Awesomeness.
^That looks like it, the only other thing I could add would be to remember SOH CAH TOA if you want to take it to x, y, r. But I don't think you'd need to go that far.
 75 Schitzo, Sat, 21st Nov '09 8:15:57 PM from Akumajou Dracula Relationship Status: LA Woman, you're my woman
TvT
Thank You, Tzetze. now i know how to structure my paragraphs.
ALL CREATURE WILL DIE AND ALL THE THINGS WILL BE BROKEN. THAT'S THE LAW OF SAMURAI.
Total posts: 1,427
 1  2
3
 4  5  6  7  8 ... 58


TV Tropes by TV Tropes Foundation, LLC is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Permissions beyond the scope of this license may be available from thestaff@tvtropes.org.
Privacy Policy