Ch 13 Prelecture
Which of the following statements are true
A satellites motion is independent of its mass The launch speed of a satellite determines the shape of its orbit around earth
Earth's orbit around the Sun is slightly elliptical. Thus, Earth actually gets closer to the Sun during part of the year. What happens to Earth's orbital speed when it is closer to the Sun?
Earth's orbital speed is greater when it is closer to the Sun than when it is farther from the Sun.
A hypothetical planet has a mass one-third of and a radius three times that of Earth. What is the acceleration due to gravity on the planet in terms of g, the acceleration due to gravity on Earth?
The acceleration due to gravity is g/27.
Which of the following statements are true
The gravitational force between two objects is inversely proportional to the square of the distance between the two objects The gravitational force between two objects is proportional to the product of the masses of the two objects
Two objects attract each other gravitationally. If the distance between their centers decreases by a factor of 2, how does the gravitational force between them change
The gravitational force increases by a factor of 4.
Two objects attract each other gravitationally. If the mass of each object doubles, how does the gravitational force between them change
The gravitational force increases by a factor of 4.
Two planets, planet A and planet B, have the same surface gravity. However, planet B has twice the radius of planet A. How does the mass of planet B compare to the mass of planet A?
The mass of planet B is four times the mass of planet A.
A planet is discovered to orbit around a star in the galaxy Andromeda at the same distance from the star as earth from the sun. If that star has 4 times the mass of our Sun, how does the orbit period of the planet compare to earths orbital period
The orbital period will be one half earths orbital period
Which of the following statements are true
The path of the planets around the sun is elliptical in shape The sun is located at one of the foci of the planets elliptical orbits
Why does a satellite in a circular orbit travel at a constant speed?
There is no component of force acting along the direction of motion of the satellite.
