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  1. rakeru

    Finding Constants to Solution Given 2nd Order, Nonlinear DE

    Homework Statement Okay, here's the deal: I have been given a second order nonlinear differential equation, and I have also been given the general solution with constants A and B. I am supposed to find the constants A and B. The solution represents a fermion at rest, since the solution does...
  2. rakeru

    Recommendation Moral Dilemma

    Hello! I am wondering if anyone can help me decide what to do about this problem. I'm at a college majoring in physics, and I'm almost done with my two years. I'm applying to different universities,and I have a professor that wishes to write me a recommendation for when I transfer. He asked me...
  3. rakeru

    Is the Derivative of a Function a Differential Equation?

    Is the derivative of a function a differential equation? I guess it would be because it involves a derivative, right? Would the solution to the equation just be the original function? Is solving a differential equation just another way of integrating? Like with finding solutions of separable...
  4. rakeru

    Rolling Ball and Proportionality Between Distance and Time

    Homework Statement A ball starts from rest and rolls down a hill with uniform acceleration, traveling 130m during the second 6.0s of its motion. How far did it roll during the first 6.0s of motion? Homework Equations I guess: v=v(0)+at v^2=v(0)^2+2ay x=x(0)+v(0)t+0.5at^2 The Attempt at...
  5. rakeru

    Two values for m for which a line is tangent to a parabola

    Homework Statement Hi! I am doing some problems to practice for a math competition, and I'm wondering if I did this correctly. I don't really have an answer sheet, so I have no way of knowing whether I'm right. If you would please review it, that would be cool! It reads: There are...
  6. rakeru

    Schools French Universities For Physics

    Hello! I'm wondering if anyone knows any universities in France that have a great physics department. I'm currently in my second year of college getting my associates degree, and I'm looking at options in France for my bachelors. My French professor is always talking about French...
  7. rakeru

    Does it matter if L + epsilon is not in the range of the function?

    Homework Statement Use a graphing calculator to find \delta when 0<|x - \pi/2|<\delta and |sin(x) - 1|<0.2 Homework Equations I don't think there are any other than the format of the previous information: 0<|x-a|<\delta and |f(x)-L|<\epsilon The Attempt at a Solution Okay...
  8. rakeru

    Finding the point where the net electric field is zero

    Homework Statement The question wasn't really written down. It was a question asked after an explanation, and it really wasn't straightforward. I'm going to try to make it into a intelligible thing. If there is a +3 charge and a -1 charge at a distance from one another, where to the right...
  9. rakeru

    Finding a Coefficient in an Expansion (n-j is negative?)

    Homework Statement Find the coefficient of x8 in the expansion of (x2-3)7 Homework Equations This one: (n n-j) an-jxj The Attempt at a Solution Hi! Well, I know that x= x2 a= -3 n= 7 and apparently, j=8. This is what confuses me. n-j is a negative number.. how would...
  10. rakeru

    History of Physics

    Hello! I've recently begun to read a lot of nonfiction books. I'm currently reading a book about stories told by Richard Feynman about his amazing life. It's hilarious and so clever. I would absolutely LOVE to read a book on the history of physics!! I think it's really fascinating. Could...
  11. rakeru

    Tension and Acceleration with a Pulley and Two Masses

    Homework Statement If there is a mass on a frictionless table connected by a string to another mass hanging from a pulley off the side of the table, is the net force on the string zero? Is the force of tension equal on both sides if the system is accelerating? Would both objects accelerate...
  12. rakeru

    Pre-Calculus and Trigonometry

    Hi! I am currently taking a math class called college algebra. Here's the little description thing: MAC1105 - This course introduces the student to the concept of functions and their graphs. Students will graph linear, quadratic, rational, exponential, logarithmic, radical, power, and...
  13. rakeru

    Why do people say that the person would be weightless?

    Homework Statement If someone is in an elevator that is in free fall, why do people say that the person would be weightless? Wouldn't the person weigh mass times the gravitational acceleration?
  14. rakeru

    Finding Gravitational Acceleration from a Slope

    Homework Statement I have a graph of time squared vs. height. It shows the relationship between the height of a ball and how long it takes for it to fall, squared. I don't have this in the form of a question, but I need to use the slope, which is 0.211 s^2/m, and turn it into a value for...
  15. rakeru

    Deriving Projectile Motion Equations

    Homework Statement A projectile is fired from ground level at time t=0, at an angle of θ with respect to the horizontal. It has initial speed V0. Part A Find the time it takes the projectile to reach its maximum height. Express in terms of V0, θ, and g. Part B Find the time at...
  16. rakeru

    Very Vague Graphing Motion Problem

    Homework Statement A stone is thrown upward from the edge of a cliff, reaches its maximum height, and then falls down into the valley below. A motion diagram for this situation is given, beginning the instant the stone leaves the thrower’s hand. Construct the corresponding motion graphs...
  17. rakeru

    Finding Angles in Projectile Motion

    Homework Statement A fire hose held near the ground shoots water at a speed of 6.8 m/s. At what angle(s) should the nozzle point in order that the water land 2.0 m away? Why are there two different angles? ax=0 xo=0 x=2.0 m ay= 9.80 m/s/s y0=0 y= I'm guessing 0, because it lands on...
  18. rakeru

    Chemistry Can I Convert Moles Between Products?

    Homework Statement Hi! I was assigned a problem for chemistry like this: 2 A + B → 2 C + 3 D It asks to find mol of C if you start with 0.320 mol D.. Can I convert between C and D? I know that I can convert between A and B.. but I'm not sure about C and D. Homework Equations...
  19. rakeru

    Should I Take Calculus 3 and Differential Equations at Once?

    Hi! I'm a student at a community college and I'm getting an AA in physics to transfer to a university. I eventually want to apply to medical school with a bachelors degree in physics. I've recently been going over the classes required for medical school and for the physics major. I've...
  20. rakeru

    How do I balance this chemical equation with a fraction?

    Homework Statement Hi! I am currently learning how to balance equations in chemistry but something that I don't understand is using fractions to balance an equation. I have a problem that I can't work out because I'm so confused! The problem says: Complete and balance the acid-base...
  21. rakeru

    Finding Mass of Isotope After Radioactive Decay by Half-Life

    Homework Statement A radioactive sample contains 2.25g of an isotope with a half-life of 3.8 days. How much of the isotope in grams will remain after 11.0 days? Homework Equations The Attempt at a Solution Hi! I've just started college this semester. I'm taking Introductory Chemistry...
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