You are at mission control on the moon, in charge of launching a moon-orbiting communications satellite. If you want your satellite at an altitude of 100 km, what orbital velocity is required? The radius of the moon is 1.74x106 m. The mass of the moon is 7.26 x 1022 kg.
1620 m/s
2.78 x 106 m/s
1670 m/s
2.63 x 106 m/s
Question 2
2.
The earth is 1 Astronomical Unit from the sun and its period of revolution is 1 year. If a planet is 36 Astronomical Units from the sun, what is its period of revolution?
11 years
216 years
3,175 years
46,656 years
The table below shows gravitational data for a planet traveling in an elliptical orbit around a star. The table shows the relative gravitational force between the star and this planet at eight positions in the orbit (letters A through H). Higher numbers indicate stronger gravitational attraction.
Which diagram best represents the positions of the planet in its orbit that would produce the gravitational forces shown in the data table?
Which diagram shows a planet with the least eccentric orbit?
The diagram below represents the position of Earth in its orbit and the position of a comet in its orbit around the Sun.
Which inference can be made about the comet's orbit, when it is compared to Earth's orbit?
Earth's orbit has a greater distance between foci than the comet's orbit.
The comet's orbit has a greater distance between foci than Earth's orbit.
The comet's orbit has one focus, while Earth's orbit has two foci.
Earth's orbit and the comet's orbit have the same distance between foci.
In order for a satellite to remain in orbit, the satellite must have reached the required orbital
momentum
acceleration
velocity
displacement
The data table shown gives the mean radius of orbit R and the period T of some planets orbiting the Sun. Which ratio is constant for these planets?
R2/T2
R/T
R3/T2
R2/T
The diagram below shows a comet in an elliptical orbit around a star.
Which arrow indicates the direction of the gravitational force the star exerts on the comet when the comet is in the position shown?
1
2
3
4
Which statement describes the motion of Earth around the sun?
The speed of Earth is constant because the distance remains the same between Earth and the sun.
The speed of Earth is constant regardless of its distance from the sun.
Speed increases the closer Earth is to the sun and decreases the farther it is from the sun.
Speed increases the farther Earth is from the sun and decreases the closer it is to the sun.
The accompanying chart gives the mass and orbital period (time it takes to go around the Earth) of each of four satellites, A, B, C, and D, orbiting Earth in circular paths. Which satellite is closest to the Earth?
