Solar system and orbital motion：練習問題

A planet is in a stable circular orbit around a star. What is the primary role of the gravitational force in this system?

A scientist is calculating the required orbital speed for a new artificial satellite. Which of the following factors will not affect the speed required for a stable circular orbit at a specific radius \( r \)?

Which of the following correctly describes the main components of our solar system as defined in current scientific models?

Compare a satellite in a geostationary orbit with a satellite in a low polar orbit. Which statement correctly describes their motion?

If an artificial satellite is moved from a low circular orbit to a higher circular orbit further from the Earth, how does its stable orbital speed change?

Compare the orbital speed of a satellite in a low Earth orbit with a satellite in a high geostationary orbit, and identify the force that determines this difference.

Using the concept of centripetal force, explain how the force of gravity maintains the orbital motion of a moon without causing it to crash into the planet it orbits.

Explain why a planet orbiting the Sun is considered to be constantly accelerating, even if it maintains a constant orbital speed.

Artificial satellites are placed in orbit around the Earth to facilitate communications and scientific research.

Explain how the orbital radius of a satellite must change if its orbital speed is increased to maintain a stable circular orbit. In your answer, refer to the role of gravity as a centripetal force.

The solar system consists of many objects with different types of motion.

a) Compare the orbital paths of a planet and a comet orbiting the Sun.
b) Explain how gravity provides the centripetal force required to keep a planet in orbit, and describe how this force affects the planet's velocity and speed.