皮皮学，免费搜题
登录
搜题
【单选题】
如图所示，一个小物体，置于一光滑的水平桌面上，一绳其一端连结此物体，另一端穿过桌面中心的，物体原以角速度w在距为R的圆周上转动，今将绳从小缓慢往下拉。则物体【图片】A.
动能不变，动量改变
B.
动量不变，动能改变
C.
角动量不变，动量不变
D.
角动量不变，动量、动能都改变
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Foreign Adoptions Madonna, as you might have heard, is in the process of adopting a baby from Malawi. The one-year-old boy named David was flown last month to London. The American pop music star and h...
A.
Y
B.
N
C.
NG
【单选题】听力原文：M: Jane, have you got time this evening? W: Not really, I'm afraid. But I'll be free tomorrow. M: Well, I'll be busy then. Maybe another time, I'll ring up to see if you are not engaged in anythi...
A.
They will meet later.
B.
They will not be able to see each other.
C.
The woman has got something to do.
【单选题】－Why have you decided on the countryside for your holiday? －Because we are there is lots of clear, fresh air there.
A.
so many
B.
much
C.
many
D.
several
【单选题】-How can I make friends in a new school? -Say hello to __________ to you today, and you can have a friend tomorrow. [ ]
A.
new someone
B.
someone new
C.
new anyone
D.
anyone new
相关题目：
参考解析：
知识点：
题目纠错 0
发布
