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.

a is the best answer your welcome

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia