Question

Galaxy B moves away from galaxy A at 0.501 times the speed of light. Galaxy C moves away from galaxy B in the same direction at 0.783 times the speed of light. How fast does galaxy C recede from galaxy A? Express your answer as a fraction of the speed of light.

Answer #1

Consider a spiral galaxy that is moving directly away from Earth
with a speed V = 3.040×105 m/s at its center, as shown in the
figure(Figure 1). The galaxy is also rotating about its center, so
that points in its spiral arms are moving with a speed v =
6.650×105 m/s relative to the center.
If light with a frequency of 8.213×1014 Hz is emitted
in both arms of the galaxy, what frequency is detected by
astronomers observing the arm...

Imagine a photon coming from the Andromeda Galaxy 2.5 million
light years away and hitting your eyeball (fun fact: the Andromeda
Galaxy is the farthest object that a human can see with unaided
eyes!). How much time does the photon experience during its trip?
Explain.

A spaceship is traveling at a speed of 0.720 times the speed of
light, as measured from earth, when it jettisons a load of trash.
If the captain of the spaceship sees the trash fall behind the ship
at a speed of 0.420 times the speed of light, what speed (as a
fraction of c) does an Earth observer measure for the
trash?

Show all calculations and formulas used.
The closest star to earth is 4.253 light years away. How far is
that in miles?
The fastest space probe ever designed has a speed of about
58,000 km/h. How long would it take it to cross the length of the
milky way galaxy?
If the parallax angle of a star is 0.000075% then how far away
is that star?
What is the relative brightness of the Sun as seen from Saturn
as compared...

In an attempt to reduce the extraordinarily long travel times
for voyaging to distant stars, some people have suggested traveling
at close to the speed of light. Suppose you wish to visit the red
giant star Betelgeuse, which is 430 lyly away, and that you want
your 20,000 kgkg rocket to move so fast that you age only 38 years
during the round trip.
A) How fast (vv) must the rocket travel relative to earth?
Express your answer as a...

In an attempt to reduce the extraordinarily long travel times
for voyaging to distant stars, some people have suggested traveling
at close to the speed of light. Suppose you wish to visit the red
giant star Betelgeuse, which is 430 ly away, and that you want your
20,000 kg rocket to move so fast that you age only 38 years during
the round trip.
A.) How fast (v) must the rocket travel relative to earth?
Express your answer as a...

A proton moves with a speed of 0.88c. Find the speed of an
electron that has the same momentum and kinetic energy. (Express
the answer as the quantity of one minus a number times c.)

A proton moves with a speed of 0.66c. Find the speed of an
electron that has the same momentum and kinetic energy. (Express
the answer as the quantity of one minus a number times c.)
same momentum (1- answer) x c
same kinetic energy (1-answer) x c
answer is where the answer would be plugged in, thank you!

A proton moves with a speed of 0.66c. Find the speed of an
electron that has the same momentum and kinetic energy. (Express
the answer as the quantity of one minus a number times c.) same
momentum (1- answer) x c
same kinetic energy (1-answer) x c
answer is where the answer would be plugged in, thank you!
Please show all work and steps for thumbs up

. The speed of light is measured 64 times by a new procedure.
The measurements are recorded, and show no trend or pattern. The
investigators work out the average and SD of the 64 numbers; the
average is 299,789km/s and the SD is 10 km/s .
a) The speed of light is estimated as _____; this estimate is
likely to be off by ____ or so
b) Find an approximate 95%-confidence interval for the speed of
light, showing your work....

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