Aspace traveler moving at a speed of 0.70c with respect to the earth makes a trip to a distant star that is stationary relative to the earth. he measures the length of this trip to be 6.5 light-years. what would be the length of this same trip (in light-years) as measured by a traveler moving at a speed of 0.90c with respect to the earth?

d2 = 3.97 light years.

Explanation:

speed of the first traveler (V1) = 0.7 c

distance if the star (d1) = 6.5 light years

speed of the second traveler (V2) = 0.9 c

applying the formula , where 'd' is the distance between the earth and the star measured by an observer from earth,

we can get the value of 'd' and subsequently get  the length for the second traveler

d =

d = 9.1 light years

the distance from an observer on earth is 9.1 light years

now the length of the second traveler would be

d2 = 3.97 light years.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.