# Kepler's Laws - Page 2

Questions

- True or false? -the speed of a planet is different at different positions in it's orbit.
- The greatest distance between Earth and the sun during Earth's revolution is 152 million kilometers. What is this distance in megameters?
- What is the orbital velocity for the Earth as it orbits the Sun?
- What is 'relativity' in physics? Does it mean that a colonist living on the moon will age more slowly than her sister who remains on Earth?
- A satellite in a nearly circular orbit is 2000 km above the earth's surface. The radius of Earth is approximately 6400 km. If the satellite completes its orbit in 12 hours, what is the speed of the satellite in kilometers per hour?
- Which of Kepler's laws gave Newton the idea about gravitational force and how it is related to distance?
- Why are rockets launched eastward at Cape Canaveral?
- What is the period of revolution of a planet in circular orbit around a star of 4.0 solar masses if it is at a distance from the star equal to that of the Earth from the Sun?
- If a small planet is located eight times as far from the sun as Earth (#1.5 * 10^11# #m#), how many years would it take the planet to orbit the sun?
- Why does a sprinter running in a 200 m event lean towards the centre of the curve he is rounding?
- Using newton's law of gravitation prove keplar's third law of planetary motion for circular orbits?
- How is it that a planet doesn't move at a constant speed but is able to cover an equal distance over equal times?
- What is the energy required to launch an m kg satellite from earth's surface in a circular orbit at an altitude of 2R? (R=radius of the earth)
- How do I find the distance #r# separating the spheres given the following...?
- 2 reasons why it takes long for the outer planets to orbit around the sun?