A man turns with an angular velocity on a rotating table, holding two equal masses at arms’ length. If he drips the two masses without moving his arms, will his angular velocity be changed?
A man turns with an angular velocity on a rotating table, holding two equal masses at arms’ length. If he drips the two masses without moving his arms, will his angular velocity be changed?
• 不会 -92168- ♀ (0 bytes) () 11/14/2020 postreply 01:28:00
• 坐等。-:) -有言- ♂ (0 bytes) () 11/14/2020 postreply 01:47:13
• 角动量守恒嘛 -宝马奔驰- ♂ (152 bytes) () 11/14/2020 postreply 02:52:18
• you mean drops? -borisg- ♂ (0 bytes) () 11/14/2020 postreply 03:31:04
• 两球沿着切线方向飞出并保持各自的角动量,故人的角动量及角速度不变。 -jlmil- ♀ (0 bytes) () 11/14/2020 postreply 04:23:36
• 球脱手的刹那是算守恒的时刻,什么都不变啊 -眼镜- ♂ (0 bytes) () 11/14/2020 postreply 07:00:37
• 谁说的,球在脱手时再也没有向心力维持它转圈了,就只能做直线运动只有动量没有角动量 -宝马奔驰- ♂ (38 bytes) () 11/14/2020 postreply 07:16:10
• 向心力是垂直于角速度的,对角速度没有影响。 -千里一盏灯- ♂ (0 bytes) () 11/14/2020 postreply 07:20:04
• 球没有角速度是关键,你对,人应该转的更快了 -眼镜- ♂ (0 bytes) () 11/14/2020 postreply 07:26:02
• 但是线速度还在呀。 -千里一盏灯- ♂ (0 bytes) () 11/14/2020 postreply 07:31:53
• 如果考虑直线系统,两个同样球速度相反,动量守恒,互相抵消,没毛病 -眼镜- ♂ (0 bytes) () 11/14/2020 postreply 07:36:40
• 角速度不变 -田园景色1230- ♀ (0 bytes) () 11/14/2020 postreply 07:46:57
• 别忘了直线和旋转两个系统的动量分别守恒,不能搅和在一起 -眼镜- ♂ (0 bytes) () 11/14/2020 postreply 07:49:28
• 人角速度保持不变。球角速度开始不变,然后逐渐变慢。总体角动量守恒 -POTPRC- ♂ (0 bytes) () 11/14/2020 postreply 10:22:30
• 除了摩擦力,没有加速度。 -霞女- ♀ (0 bytes) () 11/14/2020 postreply 16:49:02