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...bump!
2. ### Least-Squares fit for a line Concept

Homework Statement Prove the following useful fact: the least-squares fit for a line through any set of points (x_1,y_1) ...,(x_N, y_N) always passes through the "center of gravity" (x-bar, y-bar) of the points, where the bar denotes the average of the N values concerned. [Hint: you know...
3. ### Satellite Orbiting

Oh man! I know, I've been stuck on this problem for hours! I think it is lame. I'll give you a heads up if I get anything.
4. ### Satellite Orbiting

OH sorry! Thanks for the info; I solved part A already.
5. ### Satellite Orbiting

Okay, that is what I was stuck on; L. I know L is measured on the surface of the planet, like arclength, and s = rtheta. But I don't know if I can get the r from that since we don't have theta? for the apparent weight, do we use w=Gm_Em/r^2 ?
6. ### Satellite Orbiting

I am having trouble with the first portion of the problem too. Do you think you could lead me in the right direction, Peach? Are you supposed to change L into some form of r, or is L = r? I'm not quite sure what to do. Any help would be great. Thanks in advance.
7. ### Average angular acceleration of a CD

Homework Statement Compact Disc. A compact disc (CD) stores music in a coded pattern of tiny pits 10^-7 m deep. The pits are arranged in a track that spirals outward toward the rim of the disc; the inner and outer radii of this spiral are 25.0 mm and 58.0 mm, respectively. As the disc spins...
8. ### Mass Ratio Question

ok, i got it. thank you =)
9. ### Mass Ratio Question

so is it MR=v_delta/v_exln?
10. ### Mass Ratio Question

Let me do the math really quickly and i'll show you what I got.
11. ### Mass Ratio Question

updated the original question.
12. ### Mass Ratio Question

Yes, it appears that it is starting from rest. How would I go about finding the mass ratio? Also, the log equation? How do I go about finding the mass of the rocket? (is that even the right question to ask)
13. ### Mass Ratio Question

It doesn't say that it has to be which i would assume it shouldn't be. All I know about the question is what you see. So to answer your question, i don't know. I was hoping someone would be able to answer that lol.
14. ### Mass Ratio Question

Homework Statement A single-stage rocket is fired from rest from a deep-space platform, where gravity is negligible. If the rocket burns its fuel in a time of 50.0 s and the relative speed of the exhaust gas is v_ex=2100 m/s, what must the mass ratio m_{0}/m be for a final speed v of 8.00 km/s...
15. ### Elastic Force over Semicircle

is there possibly a different way to write the solution? I've thought about this problem ALOT and although the answer is right, i know I'm missing something stupid.
16. ### Tangential Acceleration of park ride

No need to feel dumb, it took me HELLA long to figure that out lol. It wasn't until my boyfriend pointed that out that I realized what it was ha ha. I always forget not to overlook the obvious things in focus on the complexity
17. ### Tangential Acceleration of park ride

If the car starts at height h = 60.0 m and the radius is R = 15.0 m, compute the tangential acceleration of the passengers when the car is at point C, which is at the end of a horizontal diameter. Take the free fall acceleration to be g = 9.80 m/s^2. That is my question. The Tangential...
18. ### Tangential Acceleration of park ride

Ok, what is the exact definition of Tangential Acceleration? I spent about an hour researching to see if I could find an formula and I found one but when I found the answer I realized it was right under my nose the whole time. *hint: You didn't post all the information in the problem. The...
19. ### Elastic force on an incline

Homework Statement A 2.00-kg package is released on a 53.1 ^\circ incline, 4.00 m from a long spring with force constant 120 N/m that is attached at the bottom of the incline View Figure . The coefficients of friction between the package and the incline are \mu_{s} \;=\; 0.40 and \mu_{k}...
20. ### Compute the tangential acceleration

Got it, nevermind! BUMP
21. ### Compute the tangential acceleration

Homework Statement If the car starts at height h = 60.0 m and the radius is R = 15.0 m, compute the tangential acceleration of the passengers when the car is at point C, which is at the end of a horizontal diameter. Take the free fall acceleration to be g = 9.80 m/s^2. Homework Equations...
22. ### Tangential Acceleration of park ride

it's late lol, soo my mind is working in funky mode. while waiting I did part a lol. Going to do part D now, but might get back to it tomorrow. tired x_x
23. ### Tangential Acceleration of park ride

Hey, how did you get Part A? I have managed to get the other parts except for the Tangential Acc part but I'm working on it and making sure my calculations are right. When i get it i'll tell you how I got it but can you help me with the first part?
24. ### Block going up frictionless incline

perfect. thank you sooooo much gabee. HUGE help. it actually makes sense now too lol. thank you again.

26. ### Block going up frictionless incline

.8142m is the answer i got for C .49/sin37 is how i got that.
27. ### Block going up frictionless incline

i got h= .13 m i got .13m from .22sin 37 degrees What do i do from that? And yes, you know me? lol, what a small world haha.
28. ### Block going up frictionless incline

ohh, i got .49m as the distance. But the HW is saying that's wrong. *starting to get frustrated lol*
29. ### Block going up frictionless incline

49.39 is what I got using this calculation: U1 + K1 = U2 + K2, but since K1 and K2 = 0, U1 = U2, being that [U1] 1/2kx^2 = [U2] mgh, so; 1/2 (400n/m)(.22m)^2 = 2(9.8m/s^2)h 968. = 19.6h h = 49.39 m
30. ### Block going up frictionless incline

(Kx^2/2) = mg(.13m) ? Using wrong reference in my notes lol.
31. ### Block going up frictionless incline

So find the E first and that'll tell me the distance right? Should I just plug in a distance to reference when the block stops? I apologize for sounding reallllly stupid or thick-headed, I've been studying allllll day and am kind of having a brain fart. Basically, without telling me the...
32. ### Block going up frictionless incline

HAHAHA, yah...sorry.:rofl: The first part of the question asked how fast was the block moving and I got 3.11 m/s. The second is wondering how far it went up the incline.
33. ### Block going up frictionless incline

Homework Statement A 2.00-kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a frictionless, horizontal surface and then up a frictionless incline with slope 37 degrees Homework...