If astronaut a(90kg) and astronaut b(110kg) are linked by 9.5m of rope and the centre of mass is 5.2m from astronaut a. what is the velocity of the 2 astronauts?

current flows in a wire

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.