A1000.-kilogram roller coaster goes down a hill that is 90. meters tall. its speed at the bottom is 40. m/s. a. what is the efficiency of the roller coaster? assume it starts from rest at the top of the hill., b. what do you think happens to the “lost” energy? ,c. use the concepts of energy and efficiency to explain why the first hill on a roller coaster is the tallest

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?