How long would it take to travel 4 light years

Asked by wiki @ 28/10/2021 in Physics viewed by 679 People

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 5.0 years, as measured by travelers on the spacecraft?
(b) How long does the trip take according to Earth observers?

Answered by wiki @ 28/10/2021

Answer:

a) v = 2,152 10⁸ m / s b) t = 2.71 10⁸ s or t = 85.93 year

Explanation:

a) In this special relativity exercise we have that time is measured in the same ship, so it is the proper time,

v = d / t

Let's reduce the distance to the SI system

d = 4.3 l and (9.46 1015 m / 1ly) = 40.678 10¹⁵ m

t = 5.0 y (365 day / 1 y) (24 h / 1 day) (3600s / 1h) = 1.89 10⁸ s

Let's calculate

v = 40.678 10¹⁵ / 1.89 10⁸

v = 2,152 10⁸ m / s

b) The time seen from the ground for which the ship moves is given by

t = t₀ / √ (1- (v/c)²)

Let's calculate

t = 1.89 10⁸ / √ (1 - (2.152 / 2.998)²)

t = 1.89 10⁸ / 0.6962

t = 2.71 10⁸ s

Let's reduce this time to years

t = 2.71 10⁸ s (1h / 3600s) (1day / 24h) (1 and / 365 d)

t = 85.93 year

Do you know the better answer?

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