ASTRO 101 QUIZ 6 - BOLD ANSWERS

1. A straight line has an eccentricity of:
 a. 0
 b. 1 
c. greater than 0 and less than 1
d. greater than 1

2. If you decrease the masses of two bodies while keeping their distance of separation the same, the gravitational attraction
 between them will:
 a. increase b. decrease c. remain the same d. create chaos and dogs will start marrying cats

3. T – F All of the Major planets in our solar system are accelerating.

4. Imagine two planets, planet A and planet B. Planet A has a mass of one earth and a radius of 3 earths. Planet B has a mass
 of one earth and a radius of 6 earths. Which planet would exert the least amount of gravitational pull on an object sitting on
 the surface ?
 a. Planet A b. Planet B c. They would be the same

5. In order to create an orbit two motions are required. The two motions are ________________and ________________.
 (choose two answers)
 a. acceleration due to gravity c. elliptical conformity
 b. tangential velocity d. parallel motion

6. In simple language, Kepler's second law states:
 a. a planet moves more slowly when near the Sun than when farther away.
 b. planets close to the Sun have shorter orbital periods than those farther away.
 c. the Sun is at the center of planetary orbits.
 d. slowly moving planets are close to the Sun.

7. Which of the following is a statement of Kepler's first law?
 a. planets move in perfect circles with the Sun at the center
 b. planets move along an elliptical path with the Sun at the center 
 c. planets move along an elliptical path with the Sun at one of the foci 
 d. planets move along an elliptical path with the Earth at one of the foci

8. Newton’s 3rd law
a. states that in order to accelerate a mass you must apply a force.
b. states an object in motion always travels in a straight line.
c. states that for very action has an equal reaction. 
d. describes the force of gravity.

9. Newton’s 2nd law
a. states that in order to accelerate a mass you must apply a force. 
b. states an object in motion always travels in a straight line.
c. states that for very action has an equal reaction.
d. describes the force of gravity.

10. According to Newton's First Law of Motion, if the sun's gravity were suddenly disappear, the planets would
a. continue to orbit in circular paths.
b. continue to orbit in elliptical paths.
c. move in a straight line.
d. Newton's First Law does not deal with gravity, so there would be no affect