有没有英语好物理又好的达人帮我看看题目怎么做?For an isolated system,the centre of mass1.always moves with constant acceleration regardless of the motion of the individual particles.2.always moves with constant velocity regardles

有没有英语好物理又好的达人帮我看看题目怎么做?For an isolated system,the centre of mass1.always moves with constant acceleration regardless of the motion of the individual particles.2.always moves with constant velocity regardles
有没有英语好物理又好的达人帮我看看题目怎么做?
For an isolated system,the centre of mass
1.always moves with constant acceleration regardless of the motion of the individual particles.
2.always moves with constant velocity regardless of the motion of the individual particles.
3.always remains at rest regardless of the motion of the individual particles.
Does an inelastic collision conserve mechanical energy?
a.Yes b.No.
On a 'merry-go-round' .one child sits near the central axis,while another sits on the outer edge or perimeter of the disk.Which child will have the larger angular velocity?
a.The first child at the centre?
b.The child on the outer edge or perimenter?
c.They both have the same angular velocity?
A solid cylinder,a solid sphere,and a thin hoop or ring are made of three different materials such that they all have the same outer radius and same total mass.Which will have the larger moment of inertia?
a.The cylinder?
b.The sphere?
c.The hoop or ring?

有没有英语好物理又好的达人帮我看看题目怎么做?For an isolated system,the centre of mass1.always moves with constant acceleration regardless of the motion of the individual particles.2.always moves with constant velocity regardles
一个物体,无论其内部如何远动,只要不受外部作用,它的质心总是不会变的.→ 所以第一题选3.
碰撞过程中物体往往会发生形变,还会发热、发声.因此在一般情况下,碰撞过程中会有动能损失,即动能不守恒,这类碰撞称为非弹性碰撞.→ 所以第二题选b.
旋转木马是一个圆形吧,所以在这个圆上的每个点角速度都是一样的.但线速度不一样,外面的大一点.→ 第三题选c.
不过表示central axis在这题里面是什么意思不太清楚……
moment of inertia 我查了一下,惯性矩啊……
= =没学过……不好意思~
好奇一下~这个是SATⅡ的物理吗?

有没有英语好物理又好的达人帮我看看题目怎么做?
我来了，但是没题做。

有啊…可是题目在哪里？

只能意会，不能言传？

无图无题。。无真相。

冰激凌_Ice 回答得比较不错，第一个问题 应该选2，一个物体在不受外力的情况下保持静止或者匀速运动状态。
2，3两个问题 冰激凌_Ice 基本正确。
4问题我也不知道，这个要计算，但忘记怎么算了。如果猜的话，就猜球体把，呵呵！