# Science

istance of a planet from sun is four times the distance of the planet frpm earth.How many years will the planet take to complete one revolution of sun?

1. recall Kepler's 3rd law:

P^2/a^3 is constant

Now we have to interpret your statement. As it is, it is rather ambiguous. Read it carefully.

Assuming the most convenient meaning, I'll say that if we substitute 4a for a, we have to find P' such that

P'^2/(4a)^3 = P^2/a^3
P' = 8P

so, the period is 8 times as long.

posted by Steve

## Similar Questions

1. ### physics help 3!! **

Based on the following data about planet X (which orbits around the Sun): Planet X's distance from Sun = 3.6*1012 m Planet X's radius = 2*106 m Planet X's mass = 8.2*1022 kg a.) Find gx, the size of the acceleration due to gravity
2. ### earth

planet is in circular orbit around the Sun. Its distance from the Sun is 2.9 times the average distance of Earth from the Sun. What is the period of this planet, in Earth years?
3. ### Physics

1. Planet X orbits the sun with a mean orbital radius that is 6200 times that of earth. Its diameter is twice that of earth, and its mass is 8 times that of earth. A) Calculate the year of the planet X. B) Calculate the
4. ### physics

The mean distance of the planet Neptune from the Sun is 30.05 times the mean distance of Earth from the Sun. a.) Determine how many Earth-years it takes Neptune to orbit the Sun. b.) The mass of the Sun is 1.99 x 10^30 kg, and the
5. ### 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:
6. ### Science

What distance was used to define the astronomical unit (AU) A. the average distance across the sun, its diameter B. the average distance from the sun to mercury, the closest planet C. the average distance from the sun to earth,
7. ### physics

Imagine a planet that orbited the sun at a distance three times that of Earth. What would the period of that planet be in Earth years?
8. ### college

A spaceship lands on the planet whose radius is 5 times that of planet earth and whose mass is 25 times that of planet earth. Find the apparent weight of the astronaut on the second planet if the astronaut weighs 150lbs on planet
9. ### help help help

The asteroid belt between Mars and Jupiter consists of many fragments (which some space scientists think came from a planet that once orbited the Sun but was destroyed). (a) If the center of mass of the asteroid belt is about 2

Okay I am really stuck on this question Tip: ^ = exponent Example: 6x10^7 7 is exponent Question: Venus is the second planet from the sun. Earth is the third planet from the sun. The distance from Venus to the sun is 6.72x10^7 and

More Similar Questions