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单选题 23.几个力同时作用在一个具有固定转轴的刚体上,如果这几个力的矢量和为零,则此刚体( )
学科：默认课程
时间：2026-05-04 21:39:42
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How many days will the woman rent the carA. TwoB. ThreeC. FourD. Five
题目2单选题
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题目3单选题
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题目6单选题
23.几个力同时作用在一个具有固定转轴的刚体上,如果这几个力的矢量和为零,则此刚体( )A. 必然不会转动B. 转速必然不变C. 转速必然改变D. 转速可能不变,也可能改变
题目7单选题
39.花样滑冰运动员绕通过自身的竖直轴转动,开始时两臂伸开,转动惯量为<img src="https://tihai-oss-cloud.itihey.com/img/ccde104b472356a04c44710e568fbe75.jpg">,角速度为<img src="https://tihai-oss-cloud.itihey.com/img/fe36643615ea36f97d1d5ed0c55757e5.jpg"> ;然后将两手臂合拢,使其转动惯量为<img src="https://tihai-oss-cloud.itihey.com/img/9937eb556aadd4b020c5e4a289f8fc6d.jpg"> ,则转动角速度变为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/69ffef5950344c56e99a6385da3b0755.jpg">B. <img src="https://tihai-oss-cloud.itihey.com/img/828b8a99ecd6b9cf24de5c93aad38438.jpg">C. <img src="https://tihai-oss-cloud.itihey.com/img/7e1530066afb092dc22d07dc5d25073f.jpg">D. <img src="https://tihai-oss-cloud.itihey.com/img/058a3d82b6397a9f4c316cd363aa2e56.jpg">
题目8单选题
33.一人站在有光滑固定转轴的转动平台上,双臂水平地举二哑铃.在该人把此二哑铃水平收缩到胸前的过程中,人、哑铃与转动平台组成的系统的( )A. 机械能守恒,角动量守恒B. 机械能守恒,角动量不守恒C. 机械能不守恒,角动量守恒D. 机械能不守恒,角动量也不守恒
题目9判断题
平行于转轴的力对转轴的力矩一定等于零,而垂直于转轴的力对转轴的力矩一定不为零A. 正确B. 错误
题目10判断题
作用在定轴转动刚体上的合力矩为零,刚体转动的角加速度为零A. 正确B. 错误
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