Astronomy

posted by .

Darwin proposed that the Moon formed far closer to Earth than it is now. Let’s see just how close it could possibly be to Earth and survive. In particular, in the next 4 problems you will find the distance from Earth at which the tidal force due to Earth is sufficient to lift a rock off the lunar surface. To do this, imagine a rock of mass m on the lunar surface. Write an expression for the gravitational force applied by the Moon to the rock, in terms of the lunar mass Mm (input as M_m) and the lunar radius Rm (input as R_m).

  • Astronomy -

    Let the moon rock mass be m

    F = G*m*(M_m)/(R_m)^2
    is the force that hold the rock to the moon. It is the same as its weight.

    Learn the universal law of gravity.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Astronomy

    I have another question. What would an observer on the Moon looking at the Earth see?
  2. science

    The pull of gravity keeps the Moon in orbit around Earth. The distance between the Earth and Moon is about 380,000 kilometers. A crew of astronauts leaves Earth on a Monday and lands on the Moon on a Thursday. They land on the side …
  3. Physics

    The Moon orbits the Earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the Earth and the Moon and that the mass of the Earth is 5.98 x 1024 kg. Find the period for the Moon's motion around the …
  4. Physics

    Consider a space pod somewhere between earth and the moon, at just the right distance so that the gravitational attractions to Earth and Moon are equal. Is this location nearer Earth or Moon?
  5. Physics

    When a spacecraft travels from the Earth to the Moon, both the Earth and the Moon exert a gravitational force on the spacecraft. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's …
  6. science

    why can you never see the far side of the moon from Earth ?
  7. Calculus Physics

    Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line …
  8. Physics

    Just reposting. A spaceship is on a straight-line path between the Earth and the Moon. At what distance from Earth is the net gravitational pull on the probe from the Earth and the moon zero?
  9. Physics

    Many astronomers argue that the Earth and Moon should be considered a double planet,since the gravitational force by the sun on the Moon is approximately as big as that by the Earth on the moon.Using the data below for the Earth and …
  10. Moon Science

    What causes the phases of the moon as observed from the Earth?

More Similar Questions