Question

A certain star is 79.3 lightyears away. How many years would it take a spacecraft traveling .929c to reach that star from earth, as measured by observers on earth?

Answer 1

Answer:

t = 85.36 years

Explanation:

given,

distance of star = 79.3 lightyears

speed of the space craft = 0.929 c

time = ?

we know,

distance = speed x time

$t = \dfrac{d}{v}$

$t = \dfrac{79.3\times \dfrac{9.461\times 10^{15}\ m}{1 \ light year}}{0.929 \times 3 \times 10^8}$

t = 269.199 x 10⁷ s

$t = \dfrac{269.199\times 10^7}{365\times 24 \times 60 \times 60}$

t = 85.36 years

time taken by the space crafty to reach star is equal to 85.36 years.