题目

Mr. Hutman owns a restaurant.  One day, one ofhis two cooks ran away with some money.  Mr. Hutman was sad and worriedbecause the next day was Saturday, and the restaurant 19. verybusy then.  So that night he called his friends, but could not find anyoneto help. On Saturday, many people came tothe restaurant for lunch.  20. cook got so busy that he wanted to leave,too.  21. ,one of the waiters, Henry, told Mr. Hutman that he could help in thekitchen.  People who had lunch in the restaurant that day enjoyed thefood Henry cooked. Mr.Hutman was very happy and made Henry a new cook of the（8分）中子星的质量大约与太阳的质量相等，为2Kg，其半径为10Km.（已知G=6.67N·m2/Kg2，要求结果保留两位有效数字）求： （1）此中子星表面的自由落体运动的加速度？ （2）绕中子星做圆周运动的小卫星的最大运行速度是多少？