©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
AST 101 Exam #3 Questions With Correct
Answers.
Recall that 1 foot = 12 inches. Therefore, 1 square foot = - answer✔144 square inches
Recall that 1 centimeter = 10 millimeters. Therefore, 1 cubic centimeter = - answer✔1000 cubic
millimeters
The surface area of a small moon is 50,000 square kilometers, which is equivalent to: -
answer✔50,000 x 1000^2 square meters
A large boulder has a volume of 1000 cubic meters and a mass of 3,200,000 kilograms. What is
the density of the boulder, in grams per cubic centimeter? - answer✔3.2 g/cm^3
In the Introduction to Parallax animation, notice that the parallax is greater (the apparent
movement is larger) for the person than for the trees, and that the mountains do not appear to
shift at all. Why? - answer✔The amount of parallax depends on an object's distance, with greater
parallax for nearer objects.
Which statement best summarizes why stellar parallax occurs? - answer✔We view nearby stars
from different positions in Earth's orbit at different times of year.
, ©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
If the ancient Greeks had measured stellar parallax, they would have known that their belief in an
Earth-centered universe was wrong. Why didn't the ancient Greeks measure stellar parallax? -
answer✔Even for the nearest stars, parallax angles are too small to measure with the naked eye.
Based on their inability to detect stellar parallax, the ancient Greeks concluded that: -
answer✔Either Earth is the center of the universe or stars are extremely far away
Moreover, as the Parallax Angle animation shows, these measurements allow us to calculate
distances to these relatively nearby stars. If we hope to use parallax to measure distances to even
more-distant stars, which of the following telescopes would be most useful? - answer✔A
telescope that orbits the Sun in the outer solar system
Before we can use parallax to measure the distance to a nearby star, we first need to know: -
answer✔The Earth-Sun distance
Which of the following is a valid way of demonstrating parallax for yourself? - answer✔Hold up
your hand in front of your face, and alternately close your left and right eyes.
What is the cause of stellar parallax? - answer✔Earth's orbit around the Sun.
The more distant a star, the: - answer✔Smaller its parallax angle
Approximately what is the parallax angle of a star that is 20 light-years away? - answer✔0.16
arcsecond
10/10/2024 11:44 AM
AST 101 Exam #3 Questions With Correct
Answers.
Recall that 1 foot = 12 inches. Therefore, 1 square foot = - answer✔144 square inches
Recall that 1 centimeter = 10 millimeters. Therefore, 1 cubic centimeter = - answer✔1000 cubic
millimeters
The surface area of a small moon is 50,000 square kilometers, which is equivalent to: -
answer✔50,000 x 1000^2 square meters
A large boulder has a volume of 1000 cubic meters and a mass of 3,200,000 kilograms. What is
the density of the boulder, in grams per cubic centimeter? - answer✔3.2 g/cm^3
In the Introduction to Parallax animation, notice that the parallax is greater (the apparent
movement is larger) for the person than for the trees, and that the mountains do not appear to
shift at all. Why? - answer✔The amount of parallax depends on an object's distance, with greater
parallax for nearer objects.
Which statement best summarizes why stellar parallax occurs? - answer✔We view nearby stars
from different positions in Earth's orbit at different times of year.
, ©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
If the ancient Greeks had measured stellar parallax, they would have known that their belief in an
Earth-centered universe was wrong. Why didn't the ancient Greeks measure stellar parallax? -
answer✔Even for the nearest stars, parallax angles are too small to measure with the naked eye.
Based on their inability to detect stellar parallax, the ancient Greeks concluded that: -
answer✔Either Earth is the center of the universe or stars are extremely far away
Moreover, as the Parallax Angle animation shows, these measurements allow us to calculate
distances to these relatively nearby stars. If we hope to use parallax to measure distances to even
more-distant stars, which of the following telescopes would be most useful? - answer✔A
telescope that orbits the Sun in the outer solar system
Before we can use parallax to measure the distance to a nearby star, we first need to know: -
answer✔The Earth-Sun distance
Which of the following is a valid way of demonstrating parallax for yourself? - answer✔Hold up
your hand in front of your face, and alternately close your left and right eyes.
What is the cause of stellar parallax? - answer✔Earth's orbit around the Sun.
The more distant a star, the: - answer✔Smaller its parallax angle
Approximately what is the parallax angle of a star that is 20 light-years away? - answer✔0.16
arcsecond
