Two planets are never seen at midnight. Which two, and why?

A planet revolves around a certain star. At one point in the planet's orbit, called periapsis, it passes much closer to the star. Which of the following statements about periapsis is true?   The planet's orbital period becomes shorter after every periapsis.   The planet's orbital period becomes longer after every periapsis.   The planet orbits with a slower speed during periapsis.   The planet orbits with a greater speed during periapsis.

I. Directions: Complete the given table by finding the ratio of the planet's time of revolution to its radius. Average Radius of Orbit Times of Planet R3 T2 T?/R3 Revolution Mercury 5.7869 x 1010 7.605 x 106 Venus 1.081 x 1011 1.941 x 107 Earth 1.496 x 1011 3.156 x 107 1. What pattern do you observe in the last column of data? Which law of Kepler's does this seem to support? II. Solve the given problems. Write your solution on the space provided before each number. 1. You wish to put a 1000-kg satellite into a circular orbit 300 km above the earth's surface. Find the following: a) Speed b) Period c) Radial Acceleration Given: Unknown: Formula: Solution: Answer: Given: Unknown: Formula: Solution: Answer: Given: Unknown: Formula: Solution: Answer:

Which of the following is true in our solar system?  1. The planets travel in a circular path, with the sun being in the very center.  2. The planets travel in an elliptical path, with the sun being in the very center.  3. The planets travel in an elliptical path, with the sun at one of the focus points.  4. The planets travel in a helical path, with the sun located along the central axis.

Determine what the period of revolution of the Earth would be if its distance from the Sun were 3.5 AU rather than 1 AU. Assume that the mass of the Sun remains the same. The final unit should be y in the answer.

If the orbital distance to a planet doubles, its period will be a.Half b.Larger, but less than double c.More than double d.less than half e.Double

Determine what the period of revolution of the earth would be if it's distance from the sun were 6.0 AU rather than 1 AU. Assume that the mass of the sun remains the same.

What is the difference between prograde rotation and retrograde rotation?

34.  A geosynchronous satellite appears to “hover” stationary directly above a particular point on the Earth’s equator.  In order to achieve this the period of the orbit must match the sidereal period of Earth’s rotation, which is 23 hours 56 minutes.  Solve for the altitude and speed of such a satellite. (Can only use Newton's 3 laws of motion and the law of gravity where Fg=G(M1M2)/r^2 and g=GM/r^2. You can also use the uniform circular motion formulas for speed and acceleration.)