# Search results

1. ### Number of Loops in a Solenoid

Homework Statement A solenoid has a radius of 10 cm and a length of 50 cm. What I need to know to begin the problem is the number of loops ion the solenoid. Homework Equations The Attempt at a Solution One turn will have a length of 2(pi)r. I need to know the thickness of the wire...
2. ### Spherical Solenoid

Homework Statement A large number, N, of closely spaced turns of wire are wound in a single layer upon the surface of a wooden sphere of radius a. The planes of the sphere are perpendicular to the axis of the sphere (take axis to be horizontal), and turns are uniformly spaced per unit...
3. ### Synthesize propyne

I would like to know how to synthesize propyne from propane. I know there is a better answer (much better) than the one I put on my test. I said that propane should be exposed to a bromine solution in the presence of ultra violet light to create 2,2-dibromopropane. I then said to take this...
4. ### Planck's law for longer wavelengths

I was just working on a problem that asked me to show that Plank's Law for black body radiation is approximately equal to Rayleigh-Jeans Law, which expresses the energy density of black body radiation as a function of wavelength. I was to show that this relation is only true at high wavelengths...
5. ### Double integral with a circle connecting the two

I'm trying to figure out what this one symbol was I saw. I also have a guess that I would like to see if is correct. I saw a double integral with a circle connecting the two. What does this mean? Here is my guess. Is it used when dealing with Stoke's Theorem? Since ∫F°dS =∫∫ curl(F)°dS (Both...
6. ### Aluminum and iron(III) reaction

I was not expecting there to be a reaction between aluminum metal and a solution of iron chloride. I thought the aluminum would be oxidized and the iron reduced. What is the reaction that is occurring that is creating hydrogen gas on the surface of the aluminum? I know it has to do with...
7. ### How to calculate the Ksp

My lab group and I are a bit confused. We are doing a lab where we need to calculate the Ksp of calcium hydroxide in pure water and then in different concentrations of calcium chloride and potassium chloride to analyze the diverse and common ion effect. I was absent one day but my lab partner...
8. ### Enthalpy Of reaction

Im going to try my best to write out this chemical equation. Also I'm gonna write a forward arrow but it's really it should be the equilibrium arrows. [Co(H2O)6]2+ + 4Cl- --> [CoCl4]2- + 6H2O Sorry for that, I don't know how to use the math font or whatever it's called. The...
9. ### Dissolving silver carbonate

This is my last question on a prefab and I want to make sure this answer is correct. The question states; On the basis of LeChatelier's principal, explain why silver carbonate dissolves when nitric acid is added. I said it was because mixing nitric acid and silver carbonate will produce...
10. ### Activation Energy

So we just completed an experiment and we are now expected to calculate the activation energy of the reaction we ran using our data. The reaction was between crystal violet and sodium hydroxide. The reaction was performed under pseudo order conditions (sodium hydroxide concentration did not...
11. ### Adult Swim China IL equation

I'm not sure how many of you watch a show on Adult Swim called China IL but I have a question about it. The school wins the math competition and to celebrate they go out and destroy the town. Towards the end of the video someone spray paints an equation that is equal to anarchy and I'm not...
12. ### Prove if sin(1/x) diverges or converges

I want to prove if sin(1/x) diverges or converges as x approaches infinity. I know the answer is diverge because the function oscillates. I want to prove it more rigorously though, for my own well being and for the exam coming up. I am having trouble with the ratio test and I rewrote the...
13. ### Graph for helium

I'm looking for a graph that shows me the root mean velocity as a function of temperature for helium gas. Does anyone know where I can find this? Thanks.
14. ### Mass of Cu(UO2)2(PO4)2*8H2O required to contain 1.05g of P

Homework Statement Mass of Cu(UO2)2(PO4)2*8H2O required to contain 1.05g of P. I will just call that long mineral X. Homework Equations The Attempt at a Solution I have no idea what is wrong. (1.05 gP)*(1 molP/30.97 gP)*(1 molX/2 molP)*(873.68 gX/1 molX)= 14.8 gX What...
15. ### Percent copper in post-1982 pennies

% copper in post-1982 pennies Homework Statement The total mass of each penny is 2.500g, the density of copper is 8.96g/ml, the density of zinc is 7.14g/ml and the mass of a penny if it was 100% copper would be 3.11g. Homework Equations The Attempt at a Solution I am not too...
16. ### What the cosecha-transmisiones are?

I was watching a video by Boards of Canada and in the comments the cosecha-transmisiones were brought up. Does anyone know what the cosecha-transmisiones are? They said that the song contained a second password for the cosecha-transmisiones hidden in it (I can't even judge this statement...
17. ### This dimensional analysis problem.

Homework Statement The diameter of metal wire is often referred to by its American wire-gauge number. A 16-gauge wire has a diameter of 0.05082 in. What length of wire, in meters, is found in a 1.00-lb spool of 16-gauge copper wire? The density of copper is 8.92g/cm3. Homework...
18. ### Areas Bounded by Trigonometric Functions.

I will do my best to describe the problem I am working on. The problem is not from a textbook or anything but something I am working on independently to strengthen my first year calculus knowledge. What I did is I took sin(x) and -sin(x) and graphed them together. Sin(x) and -sin(x)...
19. ### The True Story

My professor has been driving the class nuts by not telling us how Tycho Brahe really died. I'm having trouble with the internet because the sites I have looked at tell me exactly what my teacher tells us there is more to. Does anyone have a good link or the story of how Tycho really died...
20. ### Schools Community college student at El Camino college

I currently am a community college student at El Camino college (it's a community college, I was late to liking school, especially the subjects involving math and science). I have kept a 4.0 for the three semesters I have been there. I have been taking "college" courses. I really want to go...
21. ### My Own Problem

My friend was doing an analytical geometry problem and a shape appeared that I wanted to find the area of with my new knowledge of integrals. I found the area and i'm now working to find an equation for the nth area as the size of the shape changes for all integers. After doing the math I come...
22. ### Using Rolle's theorem to prove at most one root

Homework Statement show that the equation x^3-15x+C=0 has at most one root on the interval [-2,2] Homework Equations The Attempt at a Solution I know I need to use Rolle's theorem but i'm not sure how to find the answer. Thanks.
23. ### Probably an easy answer

I'm only a first year calculus student so I don't feel too bad asking this probably really dumb question. I noticed in my textbook that the definition of a differential equation was an equation involving the derivatives of a function. Soooo wouldn't that mean that any equation where you can...
24. ### What is u equal to?

Homework Statement ∫(x^7/(1+x^16)dx Homework Equations The Attempt at a Solution I feel like it's so simple. I have tried making u equal to 1+x^16 and then trying to find some sort of chain I can use to make the equation work but no luck. When i saw that arctan was in the correct...
25. ### Whats the History of the Integral?

For some reason I thought it would be easy to find but i'm trying to find a history of the integral. I'm not really looking for Wikipedia because I know that anyone with a computer can go and change the content so i'm not sure how true it is. Does anyone know of a good source I can look at...
26. ### Curve Sketching

Homework Statement I need to find an x-intercept for this trigonometric equation, f(x)=(x/2)-sin(x). I already know that one of the intercepts in (0,0) because that is a y-intercept. I figure i could use Newton's method but this problem is in a section before Newton's method is introduced...
27. ### Working on a Little Personal Project

I enjoy learning things and then working on my own personal studies. I'm loving calculus right now and am working with it as much as possible in between my other classes. The problem I have set out for myself right now is to find a limit that represents ∏. Before I go on can someone please...
28. ### A Pendulum

Homework Statement If a pendulum is shortened, does its frequency increase or decrease? What about its period? Homework Equations The Attempt at a Solution I think that the frequency will increase because the length of the string will now be shorter. As far as the period I...
29. ### Pot Design

Homework Statement If you want a pot that will got hot as quick as possible and have a cooking surface that stays as hot as possible when heated what should the pot look like? Homework Equations The Attempt at a Solution I said that the pot should have a black exterior because...
30. ### Airplane Windows

Homework Statement Why are the windows on a commercial jet so small? Homework Equations The Attempt at a Solution I said because the smaller the window the less force that will be applied on it due to pressure differences. But since F=AP and the pressure stays the same the...