100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete Solutions 100% Verified $14.99
Add to cart
Quickly navigate to
Preview
  2.  
  3. Astro 7n
  4.  
  5. Astro 7n

Exam (elaborations)

Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete Solutions 100% Verified

 0 purchase
  • Course
  • Astro 7n
  • Institution
  • Astro 7n

Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete Solutions 100% Verified Newton's First Law Correct answer-An object at rest, or in motion in a straight line at a constant speed, will remain in that state unless acted upon by a force Ex) If the Sun suddenly disappeared, the Earth would ...

[Show more]

Preview 3 out of 29  pages

Document information

  • August 9, 2024
  • 29
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

Written for

  • Astro 7n
  • Astro 7n

Seller

avatar-seller
GOLDTUTORS

Reviews received

Content preview

Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete
Solutions 100% Verified
Newton's First Law Correct answer-An object at rest, or in motion in a straight line at a
constant speed, will remain in that state unless acted upon by a force

Ex) If the Sun suddenly disappeared, the Earth would continue in the direction that it was
traveling in its orbit at that time




Newton's Second Law Correct answer-The acceleration of a body due to a force will be in
the same direction as the force, with a magnitude directly proportional to its mass

-Force = Mass * Acceleration

-(A smaller mass will move faster, if the same force is applied to it.)




Newton's Third Law Correct answer-For every action, there is an equal and opposite
reaction

-The Sun exerts force on planets, and they orbit it -- the planets exert equal force on Sun, but it
only moves slightly because of its very large mass relative to the planets




The strength of gravity, g, on the surface of a planet is given by: Correct answer-g=M/R^2

where M is the mass of the planet and R is its radius




What does more mass mean? Correct answer--More gravity

If the mass of a planet were twice that of another, but they had the same radius, the gravity felt
on the surface of the more-massive one would be twice as strong

, Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete
Solutions 100% Verified
What does larger separation mean? Correct answer--Less gravity

If the radius of a planet were twice that of another, the gravity is 1/(2)^2 = 1/4 as strong



Figure out the surface gravity of Mars, relative to the Earth

Mars has 1/10 the mass of the Earth and 1/2 the radius of Earth. So for Mars, Correct
answer-g= (1/10)/(1/2)^2 = (1/10)/(1/4) = 4/10

-Mars has a surface gravity 4/10 that of Earth




Newton's Universal Law of Gravitation Correct answer-This law gives the force of gravity
between any two objects in the Universe. The force of gravity is proportional to (Mass of object
1) * (Mass of object 2) divided by the distance between the two objects squared:

F ∝ M1 x M2 / d^2



If the objects were moved 2 times closer (or, to half of their initial distance between) ...
Correct answer-F ∝ M1 x M2 / (1/2)^2 = M1 x M2 / (1/4) = 4 (M1 x M2) so the
gravitational attraction would because 4 times as great




What causes day and night? Correct answer-Rotation of the Earth on its axis




How does the Sun appear to move in the sky in the course of a day? Correct answer-East
to West, because of Earth's rotation. The stars and planets move in the same way from our
point of view, also, because of Earth's rotation

, Astro 7n Exam 1 (Unit 1 & 2) Questions with Complete
Solutions 100% Verified
What happens to the Earth in one year? Correct answer-It orbits the Sun, once




Why do we have seasons? Correct answer-The tilt of the Earth's axis of rotation, with
respect to the plane of its orbit around the Sun (The tilt is about 23 degrees)



How is the Earth's axis tilted when we have summer in the Northern hemisphere?
Correct answer-With the North pole toward the Sun




What season is it in the Southern hemisphere when it is summer in the Northern hemisphere?
Correct answer-Winter




When does Winter begin and what does that mean? Correct answer-On or about
December 21 = in the Northern hemisphere, the nights are longer than days




When does Spring begin and what does that mean? Correct answer-On or about March
21 = days and nights have equal length




When does Summer begin and what does that mean? Correct answer-On or about June
21 = days longer than nights in the North




When does Fall begin and what does that mean? Correct answer-On or about September
21 = days and nights have equal length

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller GOLDTUTORS. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $14.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$14.99
  • (0)
Add to cart
Added