What is the angular diameter (in arcseconds) of an object that has a linear diameter of 75 cm and a distance of 2 km?

Ptolemy improved the geocentric model by …
Group of answer choice

sadding epicycles and deferents 
adding crystalline spheres
moving the Sun to the center
changing the circles to ellipses

Question 2
What is the angular diameter (in arcseconds) of an object that has a linear diameter of 75 cm and a distance of 2 km?

Question 3
Which ancient astronomer measured the radius of the Earth? 

Aristarchus
Eratosthenes
Aristotle
Pythagoras 

Question 4
According to the small angle equation, if an object at a fixed distance is suddenly shrunk to a smaller size, then the angular size will … 

stay the same
decrease
there’s not enough information to say for sure
increase

Question 5
Ptolemy’s improvements were important because they explained … 

lunar eclipses
retrograde motion
solar eclipses
the motion of the Sun in the sky

Question 6
Copernicus’ heliocentric model was able to predict the location of the planets more accurately than Ptolemy’s geocentric model. 

True
False

Question 7
If the Earth were flat, then the shadows of two towers at two different places on the Earth would …

be different lengths with the one further South being longer
be different lengths with the one further East being longer
be different lengths with the one further North being longer
be the exact same length

Question 8
If it takes a planet 1.2 years to orbit the Sun, how long (in years) will it take the planet to go all the way around our sky once? 

Question 9
One of the main objections to the heliocentric model was that … 

we do not feel the Earth moving
it put some planets closer to the sun and Earth farther away
it was more complex than the geocentric model
it did not explain retrograde motion

Question 101 pts
Copernicus was the first to be able to prove that the Earth orbited around the Sun. 

True
False

Question 11
In Ptolemy’s model, it is possible to have a planetary orbit without retrograde motion. 

True
False

Question 12
If it takes a planet 5 years to orbit the Sun, how long (in years) will it take the planet to go all the way around our sky once? 

Question 13
What is the angular diameter (in arcseconds) of an object that has a linear diameter of 5 meters and a distance of 3 km?

Question 14
What is the linear diameter (in meters) of an object that has an angular diameter of 22 arcseconds and a distance of 1,400 m?

Question 15
What is the linear diameter (in meters) of an object that has an angular diameter of 110 arcseconds and a distance of 25,000 m?

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