题目

Mr. White looks out of his window. There is a boy in the street. He is eating a hot dog. There is a very thin dog in the street, too. The boy sees the dog. He says, “Come here, dog. I will give you something to eat.” When the dog comes up, the boy kicks it suddenly. The dog runs away and the boy laughs. Mr. White comes out of the house and says to the boy, “Come here. I will give you a shilling.” The boy is very happy and goes up to Mr. White. But Mr. White doesn’t give him money. Instead, he hits the boy with his stick. The boy cries and says, “Why did you hit me? I don’t ask yo“雪龙号”破冰船执行某次任务时，船体质量为1.8×107kg，匀速前行600m，受到的阻力为1.5×106N。求：（1）“雪龙号”船体受到的重力；（2）“雪龙号”克服阻力做的功。（g取10N/kg）