If the Sun is located at one focus of Earth’s 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
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
Kepler’s law can be expressed mathematically as • A. P=A • B. P=A2 • C. P2=A3 • D. P3=A2
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
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.
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.
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
If your weight on the Earth is 100~lbs, how much would you weight on the surface of a planet with the same radius, but twice the mass? • a. 400~lbs; • b. 200~lbs; • c. 50 lbs; • d. 150~lbs.
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.
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.
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.
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
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
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
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
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
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
The light year is a unit of • a. time • b. distance • c. speed • d. energy
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
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.