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14、BC
15、D
16、A
17、AC
18、B
19、C
20、AD
21、C
22、⑴4.592~4.594
⑵(Ⅰ)电路原理如图。
(Ⅱ)
(Ⅲ)
23、⑴由动量守恒得:
系统损失机械能为:
解得:
⑵M做平抛运动有:
解得:
24、因电流I恒定,导体棒受恒定安培力作用做匀减速运动,平均速度为:
平均感应电动势为:
解得:
负载电阻消耗的平均功率为:
解得:
25、如图,卫星在上运动时发出的信号被遮档
对月球:
对卫星:
解得:
卫星发出的信号被遮档时间为t,应有:
式中,,
由几何关系得:
解得:
或: