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1. Conservation Of Energy Problem

So this is the quaiton that i have problem w/: A 4kg bundle starts up a 30 degree incline with 128J of kinetic energy. How far willl it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.3? Because E_initial + Work = E_final and the Work done in the...
2. An gas molecule problem

Yes, I have fixed up on the equation. THx
3. An gas molecule problem

I am stuck in this gas problem: You are given a 10.00 gram solid mixture of Ca(ClO_3)_2 and Ca(ClO)_2. When this mixture is heated, both componds decomplse, releasing oxygen gas and leaving behind solid CaCl_2 When this 10.00gram mixture is sealed in a 10.0-Liter evacuated vessel and heated...
4. Finding the resulant from the product

I am new to Chem, and I don't quite understand how to solve this problem: Component of citrus fruits is the bitter compound limonin, which contains only carbon, hydrogen, and oxygen. When a 1.000-gram sample of limonin is subjected to complete combustion, 2.432 grams of CO_2 and 0.574 grams...
5. Wave nature of light problem

I see, so D sin (90) = (1) \alpha, which is the first minimum, and D has to be equal to the wavelength \alpha.
6. Wave nature of light problem

that sin of zero degrees is 0
7. Wave nature of light problem

Given a wavelength length \alpha, what is the maximum Width (D) of a single slit, which would have no diffraction minima? It seems like a proof problem to me and I am trying to get a head start. should I use D * sin (\theta) = m \alpha ?
8. Water wave

I find the angle to be 14.48 degree, but I didn't use the 2 meters that the question provdied. Am I missing something? I use d sin (\theta) = (m + \frac {1}{2} )(0.025m) where d = 0.05m, and m = 0 to find \theta.
9. Water wave

distance from crust to crust, gottcha
10. Water wave

how can i find the wavelength of the water wave? Is it simply just 1/2.5cm or 40m?
11. Water wave

This question is related to the wave nature of light from Giancoli: Water waves having parallel crests 2.5cm apart pass through two openings 5cm apart in a board. At a point 2.0m beyond the board, at what angle relative to the "straight-through" direction would there be little or no wave...
12. Magnetic Force

But how can i solve for l in order to calculate the Force by using F = I l B sin \theta ?
13. Magnetic Force

Ok, this problem shows up on my test today and I was wondering how you can solve it: A circular coil of wire has a diameter of 20 cm and contains 10 loops, internal resistance of 8 ohms, and the coil is placed in a 2.00T external magnetic field. When 1 volt is applied to the coil, determine...
14. Thin len problem

Oh, ray B travels in the shortest path but it takes the longest time because it stays more time in the len !
15. Thin len problem

But in this question, we have air- len (glass)(very short distance) - air, so the index of refraction doesnt affect much to the distance right
16. Thin len problem

the index of refraction
17. Thin len problem

Yes, Ray B is obvioulsy travelling in the shortest distance. But as we know that light is traveling at the speed of 3 * 10^8 m/s, what is significant about this problem? ;-)
18. Thin len problem

does the picture that i have attached interpert the question? I think this is a nice question to check my understanding of the topic :)
19. Thin len problem

This is a true of false question from my homework: Three light rays start out from a candle flame at the same time. To the right of the candle there is a lens, and to the right of the lens there is a screen. Ray A goes through the edge of the lens. Ray B goes through the center of the lens...
20. Converging lens

AHAHHAHHAHAHA. I feel myself really stupid now....can't even find the coeiffient term of a quadratic equation!
21. More Geometric optics

I dont know how the light would travel after entering the second len, the attachment shows where the rays are after the first len. It is drawn in scale, and I should expect the final image, which is inverted, have the same size as the original (becasue I got the mangification to be -1), and...
22. More Geometric optics

So when we are using the sign conversion, we only concern where the light is coming from in relative to the beginning right?
23. Converging lens

for i to be real and have two solutions, \sqrt{S^2 - 4Sf} must be greater than 0. So, s^2 - 4sf > 0 s^2 > 4sf s > 4f and we set s = i + o before, so we get the answer for the first two questiosn. But I don't know how you can get i = \frac{S \pm \sqrt{S^2 - 4Sf}}{2}, from i^2 +...
24. Converging lens

after \frac{1}{f} = \frac{1}{i} + \frac{1}{S-i} , I have f = \frac{si - i^2}{s} , and then i set the equation equals to zero: i^2 + fs - si = 0 , but i dont get how you can solve for i from i = \frac{S \pm \sqrt{S^2 - 4Sf}}{2}.
25. Converging lens

A bright object is placed on one sid eof a converging lens of focal length f, and a white screen for viewing the image is on the opposite side. The distance d_T = d_i + d_0 between the object and the screen is kept fixed, but the lens can be moved. Show that if d_t > 4f , there will be two...
26. More Geometric optics

now i have \frac{1}{-5} + \frac{1}{d_i} = \frac{1}{-10} and after calculation, i have d_i = 10cm it means that the final position of the image is 10 cm behind of the second len right? (when i say behind it, i mean the image would be in between the first and second len), and it is also a real...
27. More Geometric optics

so when I am loooking for the image position from the first len, i can basically ignore the existence of the second len. Is that what you mean?
28. More Geometric optics

Two lenses, one converging with focal length 20cm and one diverging with focal length -10cm, are placed 25cm apart. An object is placed 60cm in front of the converging lens. Determine (a) the position and (b) the magnification of the final image formed. I have a problem with this becasue...

Got it, thx
30. Another geomatric optics

hohoho nvm. you are right -3 and 3 will produce a different d_0, so if the two students are placing the obejct at exactly those location, then the magnification would be 3, even though one of them may be inverted. Thx