WGU C165 Section 3: Earth and Sky Questions with
verified answers
According to Newton's law of universal gravitation, which types of objects does
gravity act to produce a force on? Ans✓✓✓-Between every pair of objects
As you travel through the spiral galaxy, you pass by a star with several planets
orbiting it. Suppose the force of gravity between the planets and their star was
suddenly turned off. Which of the following BEST describes the motion of the
planets in the absence of any gravitational force? Ans✓✓✓-They would move in
a straight line.
As your spacecraft passes Jupiter and approaches Mars and Earth, you narrowly
avoid a collision with a rocky object about 30 kilometers across. What would this
object be classified as? Ans✓✓✓-An Astroid
At the time of your observations, the Northern Hemisphere is experiencing the
summer season. How is this hemisphere tilted with respect to the sun? Ans✓✓✓-
Tilted toward the sun
Axis of rotation Ans✓✓✓-the imaginary line from the North Pole to the South
Pole on which a planet rotates
Because of Earth's tilt and spherical shape, light from the sun strikes the Northern
Hemisphere of Earth at a different angle than it strikes the Southern Hemisphere.
Thus, the different hemispheres are heated unequally by the sun. When the
Northern Hemisphere experiences the season of fall, which season does the
Southern Hemisphere experience? Ans✓✓✓-Spring
, formula for universal gravitation Ans✓✓✓-Fg = (Gm1m2)/(d)^2
Galaxy Ans✓✓✓-a collection of hundreds of billions of stars that are clustered
together by gravity.
Newton's first law of motion says that planets continue to move in a straight line
in the same direction until an outside force acts on them. Newton's law of
universal gravitation says that planets are attracted to the sun by gravity. To obey
both laws, what must planets do? Ans✓✓✓-Move in a circular or elliptical orbit
Nuclear Fusion Ans✓✓✓-A process that occurs when hydrogen and other small
nuclei form larger nuclei, releasing large amounts of energy in the process.
On your journey, you encounter a cloud of gas particles. As the force of gravity
pulls these particles closer together, which of the following properties of the gas
also increases? Ans✓✓✓-Pressure, density, temperature
Orbit Ans✓✓✓-When gravity causes one celestial body to move around another
in a nearly circular path
Star Ans✓✓✓-A celestial body that is held together by its own gravity and that
releases visible light and other forms of radiant energy generated by nuclear
fission.
Suppose some regain of space happened to have a greater density of matter than
another. Which of these describes the expected effect of gravity acting on matter
in the early universe? Ans✓✓✓-Gravity would cause matter to attract an tend to
be pulled toward regions where there is already more matter.
verified answers
According to Newton's law of universal gravitation, which types of objects does
gravity act to produce a force on? Ans✓✓✓-Between every pair of objects
As you travel through the spiral galaxy, you pass by a star with several planets
orbiting it. Suppose the force of gravity between the planets and their star was
suddenly turned off. Which of the following BEST describes the motion of the
planets in the absence of any gravitational force? Ans✓✓✓-They would move in
a straight line.
As your spacecraft passes Jupiter and approaches Mars and Earth, you narrowly
avoid a collision with a rocky object about 30 kilometers across. What would this
object be classified as? Ans✓✓✓-An Astroid
At the time of your observations, the Northern Hemisphere is experiencing the
summer season. How is this hemisphere tilted with respect to the sun? Ans✓✓✓-
Tilted toward the sun
Axis of rotation Ans✓✓✓-the imaginary line from the North Pole to the South
Pole on which a planet rotates
Because of Earth's tilt and spherical shape, light from the sun strikes the Northern
Hemisphere of Earth at a different angle than it strikes the Southern Hemisphere.
Thus, the different hemispheres are heated unequally by the sun. When the
Northern Hemisphere experiences the season of fall, which season does the
Southern Hemisphere experience? Ans✓✓✓-Spring
, formula for universal gravitation Ans✓✓✓-Fg = (Gm1m2)/(d)^2
Galaxy Ans✓✓✓-a collection of hundreds of billions of stars that are clustered
together by gravity.
Newton's first law of motion says that planets continue to move in a straight line
in the same direction until an outside force acts on them. Newton's law of
universal gravitation says that planets are attracted to the sun by gravity. To obey
both laws, what must planets do? Ans✓✓✓-Move in a circular or elliptical orbit
Nuclear Fusion Ans✓✓✓-A process that occurs when hydrogen and other small
nuclei form larger nuclei, releasing large amounts of energy in the process.
On your journey, you encounter a cloud of gas particles. As the force of gravity
pulls these particles closer together, which of the following properties of the gas
also increases? Ans✓✓✓-Pressure, density, temperature
Orbit Ans✓✓✓-When gravity causes one celestial body to move around another
in a nearly circular path
Star Ans✓✓✓-A celestial body that is held together by its own gravity and that
releases visible light and other forms of radiant energy generated by nuclear
fission.
Suppose some regain of space happened to have a greater density of matter than
another. Which of these describes the expected effect of gravity acting on matter
in the early universe? Ans✓✓✓-Gravity would cause matter to attract an tend to
be pulled toward regions where there is already more matter.
