ASTRO 1 (PSU) EXAM 2 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
Copernicus - CORRECT ANSWER Had idea of sun centered universe (heliocentric)
Keplers 1st law - CORRECT ANSWER Planets revolve around the sun in elliptical orbits
w/ sun at the focus
What best describes orbit of earth around the sun - CORRECT ANSWER Ellipse that is
close to a circle
Keplers 2nd law supports idea that when a plant is closer to the sun its speed is greater - True or
False - CORRECT ANSWER True
How did Kepler originally state the 2nd law - CORRECT ANSWER A line joining a plant
and sun sweeps out equal areas in equal intervals of time
Keplers 3rd law - CORRECT ANSWER The square of a time period for an orbit of a planet
is proportional to the cube of its average distance from the sun. ( P^2 = A^3)
Saturn is 10 times as far from the sun as earth, how many times does earth orbit the sun in time
Saturn does once - CORRECT ANSWER 30 times (30 years)
Besides discovery of moons orbit Jupiter, what else did Galileo find to prove earth wasn't at
center of universe? - CORRECT ANSWER Phases of Venus
,ASTRO 1 (PSU) EXAM 2 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
What does "P" represent in Kepler's 3rd law - CORRECT ANSWER Orbital period
Of the 4 Galilean moons which is closer to Jupiter? - CORRECT ANSWER "IO"
Which moon of Jupiter is believed to have liquid beneath ice? - CORRECT ANSWER
"Europa"
Which moon of Jupiter is largest? - CORRECT ANSWER "Ganymede"
Mass of Jupiter relative to earth - CORRECT ANSWER 340 earth masses
Nearest planet to the sun? - CORRECT ANSWER Mercury
Temp of Mercury - CORRECT ANSWER 80 kelvin (-290 F)
How long is a day on Mercury? - CORRECT ANSWER 176 times as long as an earth day
(Rotation is slow)
Gravity formula - CORRECT ANSWER G = M/R^2
, ASTRO 1 (PSU) EXAM 2 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
G = gravity
M = Mass
R = Radius
Density formula - CORRECT ANSWER D = M/V
D = Density
M = Mass
V = Volume
Volume of sphere - CORRECT ANSWER V = (4/3)(pi)(r^3)
Density of water - CORRECT ANSWER 1 g per cubic cm (most gases are much less)
Venus temperature
and more facts - CORRECT ANSWER 1. 735 K (880 F)
2. Has slow rotation
3. a day/night cycle is longer than an earth year
4,. Venus is closer to the sun than earth
WITH COMPLETE SOLUTIONS
Copernicus - CORRECT ANSWER Had idea of sun centered universe (heliocentric)
Keplers 1st law - CORRECT ANSWER Planets revolve around the sun in elliptical orbits
w/ sun at the focus
What best describes orbit of earth around the sun - CORRECT ANSWER Ellipse that is
close to a circle
Keplers 2nd law supports idea that when a plant is closer to the sun its speed is greater - True or
False - CORRECT ANSWER True
How did Kepler originally state the 2nd law - CORRECT ANSWER A line joining a plant
and sun sweeps out equal areas in equal intervals of time
Keplers 3rd law - CORRECT ANSWER The square of a time period for an orbit of a planet
is proportional to the cube of its average distance from the sun. ( P^2 = A^3)
Saturn is 10 times as far from the sun as earth, how many times does earth orbit the sun in time
Saturn does once - CORRECT ANSWER 30 times (30 years)
Besides discovery of moons orbit Jupiter, what else did Galileo find to prove earth wasn't at
center of universe? - CORRECT ANSWER Phases of Venus
,ASTRO 1 (PSU) EXAM 2 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
What does "P" represent in Kepler's 3rd law - CORRECT ANSWER Orbital period
Of the 4 Galilean moons which is closer to Jupiter? - CORRECT ANSWER "IO"
Which moon of Jupiter is believed to have liquid beneath ice? - CORRECT ANSWER
"Europa"
Which moon of Jupiter is largest? - CORRECT ANSWER "Ganymede"
Mass of Jupiter relative to earth - CORRECT ANSWER 340 earth masses
Nearest planet to the sun? - CORRECT ANSWER Mercury
Temp of Mercury - CORRECT ANSWER 80 kelvin (-290 F)
How long is a day on Mercury? - CORRECT ANSWER 176 times as long as an earth day
(Rotation is slow)
Gravity formula - CORRECT ANSWER G = M/R^2
, ASTRO 1 (PSU) EXAM 2 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
G = gravity
M = Mass
R = Radius
Density formula - CORRECT ANSWER D = M/V
D = Density
M = Mass
V = Volume
Volume of sphere - CORRECT ANSWER V = (4/3)(pi)(r^3)
Density of water - CORRECT ANSWER 1 g per cubic cm (most gases are much less)
Venus temperature
and more facts - CORRECT ANSWER 1. 735 K (880 F)
2. Has slow rotation
3. a day/night cycle is longer than an earth year
4,. Venus is closer to the sun than earth
