If the Sun is located at one focus of Earth’s elliptical orbit, what is the other focus?

1
If the Sun is located at one focus of Earths
elliptical orbit, what is the other focus?

• A. Earth
• B. The Moon
• C. Nothing
• D. This is a trick question. An ellipse has only
  one focus

2
The time it takes a planet to complete one full
orbital revolution is known as its

• A. Period
• B. frequency
• C. orbital domain
• D. Velocity

3
Keplers law can be expressed mathematically as

• A. PA
• B. PA2
• C. P2A3
• D. P3A2

4
Suppose a planet has a semimajor axis of 4AU. How
long does it take for this planet to orbit once
around the Sun in terms of Earth years

• A. 2 Earth-years
• B. 4 Earth-years
• C. 8 Earth-years
• D. 16 Earth-years

5
By measuring the motion of the small moon around
Saturn we can find theapproximate mass of

• a. Saturn
• b. the moon
• c. neither object
• d. Sun.

6
Consider a basketball player dribbling a ball.
Which of the following statements is not true

• a. The ball bounces because the court floor
  pushes up on it every time it hits
• b. The floor experiences no acceleration due to
  the dribbling ball because its mass is so
• large compared to that of the ball.
• c. The ball exerts a force on the player's hand
  each time the two connect
• d. The player's hand exerts an equal force each
  time the two connect.

7
Which of the following properties of an
astronaut changes when she is standing on the
Moon, relative to when the astronaut is standing
on Earth?

• a. Weight
• b. Mass
• c. Inertia
• d. All of the above

8
If your weight on the Earth is 100lbs, how much
would you weight on the surface of a planet with
the same radius, but twice the mass?

• a. 400lbs
• b. 200lbs
• c. 50 lbs
• d. 150lbs.

9
Two objects of different mass are dropped from a
window. They have the same

• a. acceleration
• b. force of gravity on them
• c. both a and b
• d. neither of the above.

10
In a spaceship orbiting Earth, astronauts want to
measure the mass of a mouse. How can they easily
do this if they are in free fall?

• a. Place the mouse on a spring-loaded scale and
  weight it.
• b. Measure the graviational attraction between
  the mose and a steel ball of known mass.
• c. Drop the mouse from the top of the shuttle to
  its bottom.
• d. Push on the mouse with a known force and
  measure its acceleration.

11
If we increase the orbital distance of the Hubble
Space Telescope from the Earth, we also

• a. increase its orbital speed
• b.increase its weight.
• c. decrease its weight
• d. decrease its orbital speed.

12
As a blackbody object becomes hotter, it also
becomes ____________ and _____________

• a. more luminous, redder
• b. more luminous, bluer
• c. less luminous, redder
• d. less luminous, bluer

13
Compare two blackbody objects, one at 200K and
one at 400K. How much larger is the flux from the
400K object, compared to the flux from the 200K
object?

• a. Twice as much
• b. Four times as much
• c. Eight times as much
• d. Sixteen times as much

14
Star A and star B appear equally bright in the
sky. Star A is twice as far away from Earth as
star B. How do the luminosities of stars A and B
compare?

• a. Star A is 4 times as luminous as star B
• b. Star A is 2 times as luminous as star B
• c. Star B is 2 times as luminous as star A
• d. Star B is 4 times as luminous as star A

15
Which of the following factors does not
directly influence the temperature of a planet?

• a. The luminosity of the Sun
• b. The distance from the planet from the Sun
• c. The albedo of the planet
• d. The size of the planet

16
Star C and star D are equally luminous. Star C is
twice as far away from Earth as star D. How do
the brightness level of stars C and D compare?

• a. Star C appears 4 times as bright as star D
• b. Star C appears 2 times as bright as star D
• c. Star D appears 2 times as bright as star C
• d. Star D appears 4 times as bright as star C

17
The speed of light in vacuum is _____________

• a. 300,000 m/s
• b. 300, 000mph
• c. 300, 000 km/s
• d. 300, 000, 000 mph

18
The light year is a unit of

• a. time
• b. distance
• c. speed
• d. energy

19
How do the wavelength and frequency of red light
compare to those of blue light

• a. Red light has a longer wavelength and higher
  frequency than those of blue light
• b. Red light has a longer wavelength and lower
  frequency than those of blue light
• c. Red light has a shorter wavelength and higher
  frequency than those of blue light
• d. Red light has a shorter wavelength and lower
  frequency than those of blue light

20
If absorption lines are seen in the spectrum of
an object, what are we seeing?

• a. A gas in front of a source of continuum
  radiation.
• b. We are seeing the glow from a gas by itself.
• c. A source of continuum radiation is in front of
  a gas.
• d. We are seeing the glow from a continuum souce
  by itself.