如图是人抬起独轮车车把时的简化示意图，此时独轮车相当于一个 ____杠杆（选填“省力”或“费力”）；若动力臂是阻力臂的3倍，物体和车总重G为1200N，抬起车把的力F为　 ____　N．

有的同学认为“罪犯都是法院、检察院去判，做事都是有权的说了算，所以权利都在当官的手里，并不在我们人民手里”；也有的同学认为“我们还小，国家事务与我们无关”。请你结合所学知识对以上观点进行评析。 

News 1
Yuan Longping, the father of hybrid rice, won the World Food Prize on Monday. Yuan developed the world’s first popular and widely known hybrid rice. Hybrid rice plants can make more rice than regular ones.
News 2
Have you ever got angry at books that are full of mistakes? Don't worry, things will get better soon. Last week, China started checking textbooks, dictionaries and children's books all over the country. The government said the results of the check would come out at the end of June.
News 3
People will see a new "star" in the sky soon. China plants to send a satellite into space by December 2006.It will stay in space for one year. It will go around the moon and take pictures. It must be very expensive, right? That's for sure; 1.4 billion yuan!
News 4
Have you ever thought of being able to fly around the world in a few hours? One day, maybe you can. Last Saturday, the American X-43A airplane made its first flight. It reached a speed of 8,000 kilometers per hour. This makes it the fastest plane in the world.X-43A is only three to four meters long, but it's very heavy. It weighs 1,270 kilograms.