Galaxy a is moving away from us with a speed of 0.85c relative to the earth. galaxy b is moving away from us in the opposite direction with a relative speed of 0.55c. assume that the earth and the galaxies are inertial reference frames. how fast is galaxy a moving according to an observer in galaxy b?

The speed of the galaxy A moving according to an observer in galaxy B is 0.95c.

Explanation:

Given that,

Speed = 0.85c

Let is the velocity of galaxy A relative to galaxy B, is velocity of galaxy A relative to Earth and velocity of Earth relative to galaxy B.

Let’s assume that galaxy A is moving to the right,along the +x direction, so its velocity relative to earth is

Galaxy B is moving along the–x axis with a speed of 0.55c relative to earth, so its velocity is

Using velocity additional formula

We need to calculate the velocity of the galaxy A relative to galaxy B

Using formula of relative velocity

Hence, The speed of the galaxy A moving according to an observer in galaxy B is 0.95c.

the amount of current in the coil

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force