A) A spaceship passes you at a speed of 0.800c. You measure its length to be 31.2 m .How long would it be when at rest? B) You travel to a star 145 light-years from Earth at a speed of 2.90

a

b

Explanation:

From the question we are told that

    The  speed of the spaceship is  

    Here  c is the speed of light with value  

    The  length is  

     The  distance of the star for earth is

     The  speed is

Generally the from the length contraction equation we have that

Now the when at rest the length is  

So  

Considering b  

  Applying above equation

Here

So

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2