Question

Alpha Centauri is 4.4 light-years away. You travel there in a spaceship at 99.9% the speed of light. The distance between you and Alpha Centauri length contracts to:

A. 2.4 light-months

B. 9.4 light-months

C. 11 light-months

D. 4.4 light-years

E. 21 light-years

Answer #1

A spaceship is moving toward Alpha Centauri, the
closest star
system located 4.2 light-years away, at a speed of 0.98c.
a) How much time does the trip last as measured from an astronaut
onboard?
b) How much time does the trip last as measured from an observer on
earth. Assume
the distance between the earth and Alpha Centauri remain the
same.
c) What is the distance between the earth and Alpha Centauri as
seen from an
astronaut onboard the spaceship?

: A spaceship is moving toward Alpha Centauri, the closest star
system located 4.2 light-years away, at a speed of 0.98c. a) How
much time does the trip last as measured from an astronaut onboard?
(4 points) b) How much time does the trip last as measured from an
observer on earth. Assume the distance between the earth and Alpha
Centauri remain the same. (3 points) c) What is the distance
between the earth and Alpha Centauri as seen from...

Alpha Centauri A lies at a distance of 4.4 light-years and has
an apparent brightness in our night sky of 2.7×10−8 2.7 × 10 − 8
watt/m2 w a t t / m 2 . Recall that
1light−year=9.5×1012km=9.5×1015m 1 l i g h t − y e a r = 9.5 × 10
12 k m = 9.5 × 10 15 m. Suppose you have a light bulb that emits
200 watts w a t t s of visible light....

alpha centauri has an apparent magnitude of zero.
alpha centauri is 4.2 light years (1.3 pc) away from our solar
system. if you were to replace the sun with alpha centauri, how
much more luminous, compared to the sun would that star appear from
earth?

Sam is on a spaceship that travels from Earth to Proxima
Centauri at 70% the speed of light, or 0.7c, relative to Earth.
Erma is an observer on Earth. From Sam's perspective, 1.35 x
108 seconds passed between when the Earth was near him
and when Proxima Centauri is near him
First we consider velocity and time: How fast in m/s is Sam
moving as measured in the rest frame of the rocket?
How fast in m/s is Erma moving...

1/ Alpha Centauri A is a star that is remarkably like
our Sun...indeed, we can think of it as the Sun’s stellar twin.
Alpha Centauri A lies at a distence of 4.4 light-years from Earth,
and it has a luminosity of 5.88 x 10^26 W.
Calculate the apparent brightness of Alpha Centauri
A
Suppose you have a light bulb that emits 100 W of
visible light. How far away from you would you need to put that
light bulb in...

The nearest star to Earth is Proxima Centauri, 4.3 light-years
away.
A:
At what constant velocity must a spacecraft travel from Earth if
it is to reach the star in 5.5 years, as measured by travelers on
the spacecraft?
B:
How long does the trip take according to Earth observers?

I
have 6 questions
1) a spaceship passes you at a speed of 0.8c you measure its
length to be 25.4m how long would it be when at rest
2) a certain type of elementary particle travels at a speed of
2.73x10^8m/s at this speed the average life-time is measured to be
4.67x10^-6s what is the particles lifetime at rest
3) if you were to travel to a star 81 light-years from earth
at a speed of 2.8x10^8m/s what would...

26.4/5
1. A spaceship passes you at a speed of 0.760c. You measure its
length to be 26.6 m. How long would it be when at rest?
2. If you were to travel to a star 112 light-years from Earth at
a speed of 2.59×108 m/sm/s , what would you measure this
distance to be?

An observer on Earths sees spaceship 1 fly at 0.80c. 9 years
later according to the observer on Earth, spaceship 2 flies by
Earth at 0.80c, traveling in the same direction as the first. Both
spaceships continue to travel with constant velocities.
1) An observer in spaceship 1 observes Earth to pass spaceship 2
________ years after Earth passed spaceship 1.
a)7.2
b)10
c)12
d)15
e)20
An observer in spaceship 1 observes spaceship 2 to be ______
light-years away.
a)7.2...

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