# Search results

1. ### Finding simplest radical form of a 4th root?

I haven't taken math in years and am having trouble understanding how to find simplest radical form of a 4√(x14). I said x4√x10. I realize I have 3 x4ths and x2 but I'm not sure if I can pull out more xs. What are the rules for this? Ideas, insight?
2. ### Gravitational force problem: finding r

Doc, I think I misinterpreted what you said... The r2 goes under the mE. The (d-r)2 goes under the ms I did it this way and got the correct answer.
3. ### Gravitational force problem: finding r

Different attempt. Also, how can the mass of the ship cancel out if there's only one of them in the numerator and 2 in the denominator? My algebra is rusty. Edit: I didn't get the correct answer using this method. I don't know if its the calculations or if I didn't isolate properly.
4. ### Gravitational force problem: finding r

Negative. Yeah, I have no idea.
5. ### Gravitational force problem: finding r

Oooooo, I think I have it..... Sec.
6. ### Gravitational force problem: finding r

Sorry, office with scanner in it is occupado. Had to take a crappy photo. I haven't learned how to use the forum sqrt thingies and such yet. Will get on that later. Edit: WOW, worser quality than I thought. d√(Gmsmship) - r√(Gmsmship) = r√(GmEmship)
7. ### Gravitational force problem: finding r

Can't I cross multiply to get rid of the denominators?...
8. ### Gravitational force problem: finding r

I see what you're saying now. So, what I'm actually looking for is d and not r? I will multiply it out in a few min. Also, does it matter which is the r and which is the d-r? Or can I attach it to either expression? :P And, will the denominator be (d-r)2 OR (d-r2)2? :uhh:
9. ### Gravitational force problem: finding r

Hi Tim! :) I was hoping to avoid using the quadratic because we haven't used it this semester, nor does he encourage it. I will be a few moments...
10. ### Gravitational force problem: finding r

Hey there :) I was browsing online for solutions. Google, yahoo, youtube, everywhere and I found alternatives of it solved as a quadratic but those don't help me either and I'd rather not go there :rofl: I see what you did there now! But I still can't begin to imagine how r is isolated. I've...
11. ### Gravitational force problem: finding r

Hi PF, this problem came up in my homework assignment 2 months ago and the assignment online shows a solution that includes the correct formula. However, I still don't understand how to do the problem or how the formula is derived. A similar question is also on one of my worksheets and the...
12. ### Do not understand the question: Projectile motion (got correct answers)

So Vfy will be zero because the ball briefly stops before it comes down. And Viy is what we initially found for the y component (42sin60). I'm just confused as to why we're not using 42m/s as our Vi instead of the y component. Ughhh :grumpy:
13. ### Do not understand the question: Projectile motion (got correct answers)

I had no idea that a=0 for projectile motion. Thanks for that bit of info. So you're saying that if I had a time for H, I could plug that in to find H? I need to rephrase my own question.. :blushing: Why is 42sin60 Viy? Is Viy same as H? Or same as Diy? I wasn't sure what I was finding there...
14. ### Conservation of momentum theory question

Lol, okay, thanks very much for your help :)
15. ### Conservation of momentum theory question

How do we end up with people/objects going in different directions upon collision then? I've done those types of questions too. Sometimes I get the correct answer and sometimes I don't. I'd like to know a way of recognizing the problem.
16. ### Do not understand the question: Projectile motion (got correct answers)

So I got the correct answers for this question but I don't understand how. I don't understand the breakdown of the components. I don't understand where what variables should be. Homework Statement A rock is projected at a cliff with initial speed of 42m/s, at 60deg above the horizontal...
17. ### Conservation of momentum theory question

True. But when is it reversed? How do I know when it is reversed? Edit: Just based on the fact that momentum is conserved? In that case, how do I know when it's conserved? I assumed it always is.
18. ### Conservation of momentum theory question

Hi, I was wondering how one could know when velocity would be in the opposite direction in a momentum question. For example, two skaters are skating together (as one) at the same speed. Skater A pushes skater B and B moves at 13m/s. Find the speed of skater A. I found it and it's the...
19. ### Gravitational force problem: finding r

The -1 was a +1 on the other side when it was the spacecraft?... Is this a quadratic?
20. ### Gravitational force problem: finding r

Then take the sqrt of the whole thing?.... Not yet. Edit: I need a step by step..
21. ### Gravitational force problem: finding r

How was this formula derived? Gravitational stuff... This is embarrassing but I need to understand it. I'm trying to understand how to solve a problem but I don't understand how one of the variables was isolated for and I was hoping someone here could explain it please. It's seemingly basic...
22. ### What is total equivalent resistance and power dissipated?

I learned more from you today than I did from my prof this entire semester. And I honestly don't know where I'd be if you'd hadn't shown me how to do these problems. Still pulling my hair most likely :rofl: I'm gonna try to find more similar problems and work on those as well because I need...
23. ### What is total equivalent resistance and power dissipated?

Yes, they did, but what I mean is, from my lack of understanding of this unit, I would assume that the 10ohm resistor would mess with the 33ohm resistor power dissipated etc.. but you said they have the same current passing through them.. How would I do this the other way?
24. ### What is total equivalent resistance and power dissipated?

Success. .1672 x 33. What boggles my mind is why I would use one of the resistors (the 33) because they both interfere with the current. Good god. Edit: moreover, our formula sheet doesn't even have that formula. And I couldn't derive it.
25. ### What is total equivalent resistance and power dissipated?

This is truly mind blowing and my least favorite unit as of now. The total current was 0.239 and it divides into the 43 and 100 branches. Unevenly. Itot x Rblock = V block = 7.18 or 7.2V 7.2V/Rbranch = Ibranch 7.2/43 = .167 in the branch.
26. ### What is total equivalent resistance and power dissipated?

I got it! Part of it! 2.39V for each 10. and 7.18343V for the block entirely. 10.277V for the portion of the block with 33. 23.9V for the 100ohm branch of the block.
27. ### What is total equivalent resistance and power dissipated?

If V=IR and V is given as 12V, then we already have the potential drop? V/R = I, current 12/30.06 (for that block) = .399 A Or, 12/43 = 0.279 A 12/100 = 0.12 A for each branch of that block.:uhh:
28. ### How to find applied force when given force of friction (constant velocity)

Tried it that way. Doesn't work out right either.
29. ### What is total equivalent resistance and power dissipated?

Mostly helpful. I feel horrible having to interrogate you like this though. Failure at it's most pathetic. You're right. It's 50.06. I was looking at the wrong, partial solution I scribbled on the page. V/R=I 12V/50.06ohms= 0.239 A How do I get the 33 isolated?! :grumpy: I suspect having...
30. ### How to find the magnitude of the electric field?

You are a saint. It's been a long frickin day. I've been at this for the past 7 hours. Thank you and I am forever grateful for all of your explanations and for your seemingly endless patience. Oh me.. :rolleyes: