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AST (Special Relativity)
AST (Special Relativity)
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relativity special relativity einstein
Flashcards
12 cards
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Practice quiz
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Questions
12
Answers
1
A star is
25 ly
away according to earth-based obs. Jen travels @
0.8c
towards star. How far does
Jen
say she travels?
less than 25 ly
more than 25 ly
25 ly
2
What is the approximate value of the
gamma factor
for an object traveling at
0.87c
?
2.5
2.9
1.7
2.0
3
Bob makes a
5 year
roundtrip, according to his clock, @
0.9c
. How much time has passed
on Earth
during Bob's journey?
8.2 years
26.3 years
11.5 years
15.8 years
4
What are Einstein's
two postulates
of special relativity?
Laws of physics are the same for all observers moving at constant vel
The laws of physics are different depending on reference frame
The speed of light is constant for all observers
The speed of light depends on how you move
5
A star is
25 ly
away according to earth-based obs. Jen travels @
0.8c
towards star. How far does
Jen
say she travels?
15 ly
11 ly
21 ly
9 ly
6
A table is measured to be
10 ft
in length when moving
0.8c
. What is the
length
of the table when at
rest
?
less than 10 ft
more than 10 ft
10 ft
7
As measured by
moving
observers, the
distance
b/t any two points is ______ than for
stationary observers
.
longer
the same
shorter
8
A table is measured to be
10 ft
in length when moving
0.7c
. What is the
length
of the table when at
rest
?
19.6 ft
18.3 ft
11.8 ft
14.0 ft
9
As measured by
you
, a classroom meter stick
moving
(transversely) past you is ________.
longer than a meter
equal to a meter
shorter than a meter
10
Bob makes a
5 year
roundtrip, according to his clock, @
0.9c
. How much time has passed
on Earth
during Bob's journey?
more than 5 years
less than 5 years
5 years
11
As measured by
you
,
moving
clocks run _______ than your own.
away
slower
at the same rate
faster
12
The
gamma factor
Ƴ is always
< 1
= 1
≤ 1
≥ 1
