If the oort cloud contains 1012 comets, and ten new comets are discovered coming close to the sun each year, what percentage of the comets have been “used up” since the beginning of the solar system?

4.57 %

Explanation:

The age of the solar system in years is about

Each year 10 new coments enter the solar system, so the total number of comets "used up" since the beginning of the solar system is

The number of comets contained in the Oort cloud is

Therefore, the percentage of comets that have been "used up" is

the answer is 46 mls because when you add the speed per second it increses the speed

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.