Its pretty expensive and can't be replaced immediately and some source like nuclear energy produces nuclear waste which produce radioisotope that is harmful for all living beings
Answer:
<h2>In a vacuum, light travels at 670,616,629 mph (1,079,252,849 km/h). To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).</h2>
Answer:children burn calories to being a student
Explanation:That mean when a children getting ready to go to high school
Answer:
More damage is done and more life is endangered in a head-on collision of two cars, each traveling at 30 mph, than in a car crashing into a brick wall at 30 mph because the relative velocities of the head-on collision are the sum of the two velocities.
Explanation:
Car crashing to a brick wall at 30 mph is less dangerous than two cars travelling in opposite direction at 30 mph each.
This is because, for one car, the other is at a relative speed of 30+30 = 60 mph.
