Physics

posted by .

Mars' moon Phobos has a mass of 1.07x1016 kg and a mean radius
of 11.1 km. Let's say our rocket blasts off from the surface of Phobos
when Phobos is 9500 km from the surface of Mars. Does the rocket have
to work harder to escape from the gravitational pull of Phobos or that of
Mars?

  • Physics -

    The energy per unit mass required to escape the gravitational pull is
    G M/R
    where M is the mass of the planet or moon that is being escaped, and R is the radius (measured from the center) where the launch process starts. Compare the M/R values for Phobos and Mars. You will have to look up the mass of Mars and add the radius of Mars to 9500 km to get the R value for Mars. G is the universal gravity constant, which is the same for both.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. astronomy

    when earth and mars are closest to each other in their orbits the angular separation between mars's moon phobos and the surface of mars is observed to be 22 arc seconds. if phobos orbits mars every .31910 days what is the average density …
  2. Physics

    Mars has a mass of about 6.4 X 10^23 kg, and its moon Phobos has a mass of about 9.6 X 10^15 kg. If the magnitude of the gravitational force between the two bodies is 4.6 X 10^15 N, how far apart are Mars and Phobos?
  3. Physics

    Mars has a mass of about 6.4*10^23 kg, and it's moon Phobos has a mass of about 9.6*10^15 kg.If the magnitude of the grvitational force between the two bodies is 4.6* 10^15 N, how far apart are Mars and Phobos?
  4. PHYSICS- SCIENCE

    . Phobos is the larger and closer of Mars’s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, …
  5. physicsss

    Phobos is the larger and closer of Mars’s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, …
  6. PHYSICS

    Phobos is the larger and closer of Mars’s two moons. It has no atmosphere, a mean radius of 11 km, an albedo of 0.07, and an emissivity of 1.0. (i) Assuming that the radiative temperature of Phobos is 222 K and that it is spherical, …
  7. physics

    Mars has a mass of about 6.8 × 1023 kg, and its moon Phobos has a mass of about 9.5 × 1015 kg. If the magnitude of the gravitational force between the two bodies is 4.66 × 1015 N, how far apart are Mars and Phobos?
  8. Physics

    Mars has two moons, Phobos and Deimos. It is known that the larger moon, Phobos, has an orbital radius of 9.4 106 m and a mass of 1.1 1016 kg. Find its orbital period.
  9. Physics

    Mars has a mass of about 6.09x10^23 kg and it's moon Phobos has a mass of about 9.4 x10^15N how far apart are mars and Phobos?
  10. Physics

    phobos, a moon of mars has maas of 1.08 x 10^16 kg, and an average radius of 1.35x10^4 m. calculate the gravitational field strength at the surface of phobos

More Similar Questions