Recent content by callieferg

  1. callieferg

    Equation Demonstration -- Comparing a pendulum's motion to an LC circuit

    (1) The general form for the natural frequency ##ω_0## (or at least the way I learned it) is: ##ω_0=\sqrt\frac{k}{m}## (2) Look at the differential equations for Newton's second law and Kirchoff's second rule for circuits. If you can find the differences in the coefficients for each of these...
  2. callieferg

    Find the time when the projectile runs into the hill (with air resistance)

    The first step will be looking at the vertical motion of the projectile. You need to find the time where the velocity in the y direction becomes zero - if you double that, that will give you the time it takes for the projectile to reach the ground (if the incline weren't there). Also, you need...
  3. callieferg

    Need help with 2 Kinematics questions (New to forum and physics)

    Hints for Problem #2: It is given that the spacecraft traveled a distance of 32 au (the distance between Earth and its closest approach point to Pluto). The first thing we need to do is convert 32 au into kilometers, since the speed of light is given in units of km/s. ##32 \text{ au} = 1.50...
  4. callieferg

    What's the use of unit vectors?

    Every vector has both a direction and a magnitude. For example, the "x" is the scalar quantity that tells you the magnitude of the x component of r, and the x with the ^ tells you the scalar points in the x direction. So, for a vector r, it has a magnitude of "r" multiplied by the r with the ^...
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