杭州交通信息网交通世界期刊投稿:physics+english
来源：百度文库 编辑：杭州交通信息网 时间：2024/05/01 17:37:16
1。原来悬挂的小球，线断后下落的速度越来越快由于什么？
A.小球受到的重力越来越小
B.小球受到作用，不断改变运动状态
2。Tom,Jim and Emily each have a pet.One has a cat,another has a dog, and the third has a bird.The cat isn't Jim's.Tom doesn't own a cat.The person who owns the bird?
A.小球受到的重力越来越小
B.小球受到作用，不断改变运动状态
2。Tom,Jim and Emily each have a pet.One has a cat,another has a dog, and the third has a bird.The cat isn't Jim's.Tom doesn't own a cat.The person who owns the bird?
1.B(小球受到的重力越来越大，也可近似认为不变）
2.由前几句地cat是emily的，
但条件不够，只能认定bird是tom,jim中一人
1.选B
2.Jim or Tom
Emily owns a cat
1.B,物体受不平衡力的作用作变速直线运动。
2.Emily owns the cat.
The bird blongs to Jim or Tom.