Summary
Summary AST201 Exam Review Notes
- Course
- AST201 (AST201)
- Institution
- University Of Toronto (U Of T )
Exam Review notes for the AST201 class that highlights the key points
[Show more]
Seller
Follow
Content preview
AST201 Exam NotesLecture 2
-We can only measure motion relative to give and frame of reference
Ex: a plane is moving 900 km/h .A passenger throws a ball going 10 km/hr:
1. How fast is the ball moving to someone on the ground?
900+10 = 910 KM/H
2. How fast is the ball moving relative to the passenger?
10 km/hr
3. Who is right?
Both of them. It's all relative
Now doing the same thing with light:
1. Lights always travels at c (in a vacuum)
2. No object with mass can exceed the speed of light
Note: . all observers measure the same speed of light. It's invariant which means it's constant.
Always c
Foundations of special relativity
1. Speed of light is invariant
2. We can only measure speeds of objects relative to one another
Ex : Perspective of a guy throwing a ball up IN the train
- he says the ball went up 1 m, came down 1 m in one second for speed of 2m/sec
Perspective of someone standing outside looking at same situation
- he says the ball went diagonally 2metres came down diagonally 2metres in one second
for speed of 4M/S
What do observers agree on?
- The time it takes for event to happen
How about with light?
- The speed of the light ray
Note: Since the distance = Speed x time and because the two observers MUST agree about the
speed of light they must disagree about the time
Time flows at different rates for any two people in a motion relative to one another
If someone is moving relative to you:
-their clock appears to run SLOWER (time dilation)
-their lengths will all appear SHORTER to you (length contraction)
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 cookixxmonster. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.08. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53022 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now