Recent content by Kaxa2000

  1. K

    You dig a hole half way to the center of the earth. You lower an object to the bottom

    Can someone explain the gamma symbol in the gravitation equation ehild posted ?
  2. K

    You dig a hole half way to the center of the earth. You lower an object to the bottom

    What about ignoring all the layers of the earth above the hole and just using the mass left to calculate the gravitational pull of the earth?
  3. K

    Sound and hearing - conceptual question?

    Stars other than our sun normally appear featureless when viewed through telescopes. Yet astronomers can readily use the light from these stars to determine that they are rotating and even measure the speed of their surface. How do you think they can do this?
  4. K

    You dig a hole half way to the center of the earth. You lower an object to the bottom

    I used the "Inside a solid sphere of constant density the gravitational force varies linearly with distance from the center, becoming zero at the center of mass." from the reference to make my previous suggestion and yes I did get intimidated when I scrolled down from there. Can someone...
  5. K

    What happens to the lost energy in these situations?

    Yea that does help...thanks...but what about question c? Was I right about that? When an object falls some of the PE gets translated into KE which slows the object down right?
  6. K

    What happens to the lost energy in these situations?

    What happens to the "lost" energy in these situations? (a) A box sliding across the floor stops due to friction. How did friction take away that KE and what happened to that energy? (b) A car stops when you apply the brakes. What happened to its kinetic energy? (c) air resistance uses up...
  7. K

    A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters?

    After you solve for v you get 200 m/s. Do you set the KE = to the spring equation after that to find distance it goes into pillows? 1/2mv^2 = kX?
  8. K

    A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters?

    Would it be mgh + 1/2mv2 (1kg)(9.8m/s2)(2000m) + (1/2)(1kg)(v)2
  9. K

    A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters?

    A 1 Kg object is dropped from rest from a helicopter at an altitude of 2000 meters. What is the velocity of the object just before it lands upon a thick bed of pillows? The top of the pillow stack is at zero altitude. If the restoring force constant (spring constant) of the stack of pillows is...
  10. K

    You dig a hole half way to the center of the earth. You lower an object to the bottom

    You dig a hole half way to the center of the earth. You lower an object to the bottom of the hole. By what fraction has the force of the Earth’s gravity on the object been reduced relative to that at the surface? Assume that the earth is a sphere and has uniform density
  11. K

    Moment of Inertia

    Does anyone know why I'm getting a negative t? t = (w-w0)/(angular acc.) (0 - 100)/(.0125 rad/s^2) = -8000 s
  12. K

    Moment of Inertia

    I'm getting a negative answer for time? Why is this I used the w - w0 = at formula
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