Physics

posted by .

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33e9 Joules.

I found moment of inertia by .5xMRe2

How do you find angular velocity?

  • Physics -

    The moment of inertia of a uniform sphere is NOT (1/2) M R^2. Try that part again.
    http://scienceworld.wolfram.com/physics/MomentofInertiaSphere.html

    What you want to calculate is
    Rotational KE = (1/2) I w^2

    w is the angular velocity for ROTATION in radians per second, and equals 2 pi divided by the number of seconds in a sidereal day (23 hours, 56 minutes)

    The circular path assumption does NOT have to be made. They are either trying to confuse you or the teacher who assigned the question is not well trained.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United …
  2. Physics- drwls please help

    (a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United …
  3. physics

    Assume that the earth is a uniform sphere and that its path around the sun is circular. (a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United …
  4. Physics

    Assume that the earth is a uniform sphere and that its path around the sun is circular. a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United …
  5. physics - please help

    Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year …
  6. Physics

    Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, …
  7. Physics

    Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, …
  8. Physics

    Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, …
  9. PHYSICS

    Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, …
  10. Physics

    Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, …

More Similar Questions