Recent content by lcary

  1. L

    Why is there starvation in human populations?

    One factor I'm sure that's a tiny bit involved is the fact that birth control products such as contraceptives and other services are not as available to people of the lower class demographic. I think what's more involved is that for some families the dynamic of parent child roles are difference...
  2. L

    Finding concentration of Permanganate

    Thank you for replying. I wasn't entering in the correct number of significant figures, once I corrected for the error, I got the right answer.
  3. L

    Finding concentration of Permanganate

    Homework Statement Calculate the KMnO4 concentration of the solution in the cuvet. The Solution in the covet was made by mixing 5.00 ml of 1.00 M H2SO4 and 1.00 ml of the stock 2.00x10-3 M KMnO4. Homework Equations m1v1=m2v2The Attempt at a Solution I've tried using the dilution formula...
  4. L

    Calculating Molality of a Sulfuric Acid Solution

    Molality means moles solute over kg solvent but it did not say the solution was aqueous, so do not assume the solvent is water. Assume 77g in 100g solution. 100g-77g=23g solvent. Convert to kg solvent. Last step would be to convert the 77g sulfuric acid to moles using the molecular weight from...
  5. L

    Need advice applying a logistic regression to model school data

    To determine whether schools are increasing the amount of students meeting or exceeding standards, I obtained a MEAP database reporting the amount of students that scored in the met or exceed standards range during years 2005-2009, for grades 3-5. I then graphed the data for using numbers...
  6. L

    Force Homework: Find Force to Move Raft in Desired Direction

    Homework Statement I need help solving this force problem: Two crewmen pull a raft through a lock. One person is pulling from a 45 degree angle above the horizontal and the other is pulling at a 35 degree angle below the horizontal with a force of 130N. the middle of the boat (laying...
  7. L

    Position vs. Time graph equation

    I just completed a lab on the acceleration due to gravity and I have to answer a few questions about my data. Before I share what I am confused about I will give a quick run through of the lab procedures: --First I used a spark timer to mark a strip of paper with a clamp...
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