physics

Planets A and B orbit the same star. Planet B is four times further from the star than planet A and has twice the mass of planet A. The gravitational force of the star on planet B is ____ the force on planet A.

  1. 👍 0
  2. 👎 0
  3. 👁 189
  1. The force is proportional to M/R^2

    F(B)/F(A) = M(B)/M(A) * [R(A)/R(B)]^2
    = 2*(1/4)^2 = 1/8

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    The weight of an object is the same on two different planets. The mass of planet A is only forty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.

  2. science/astronomy

    4. Which of the following is a common feature among the four inner planets? (1 point) atmosphere composition distance from the sun rocky surfaces**** temperature range 5. Which of the following is the smallest terrestrial planet?

  3. Astronomy

    Suppose that future observations with a new telescope reveal a planet about 16 AU from a star whose mass is the same size as our sun's. How long does it take the planet to orbit the star?

  4. physic

    Planet A and planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than is planet B. What is the ratio of their speeds vA/vB?

  1. Science help ms sue.

    Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the

  2. Science

    What describes the current model of the atom? A)That electrons and protons move randomly around a nucleus. B)Electrons travel as waves in the electron cloud that surrounds the nucleus. C)Electrons orbit the nucleus like planets

  3. Astro

    A newly discovered planet orbits a distant star with the same mass as the Sun at an average distance of 118 million kilometers. Its orbital eccentricity is 0.5. A.Find the planet's orbital period. B.Find the planet's nearest

  4. physics

    Scientists want to place a 3100 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.9 times the radius of Mars above the surface of the planet. Here is some information that will help

  1. science

    if all of the following imaginary planets were the same distance from the sun, which would experience the strongest force of gravity due to the sun? planet a: mass 3,500 kg planet b: mass 50,000 kg planet c: mass 750 kg planet d:

  2. Science

    Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the

  3. Astronomy

    1. What size are most exosolar planets that have been detected? A. Small like the moon B. Same size as earth C. More massive than Jupiter D. More massive than the sun 2. Which NASA space mission, launched in 2009, has the goal of

  4. college physics

    new planet is discovered orbiting a distant star. Observations have confirmed that the planet has a circular orbit with a radius of 21 AU and takes 118 days to orbit the star. Determine the mass of the star. State your answer with

You can view more similar questions or ask a new question.