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判断题 不受外力的系统,机械能一定守恒.
学科：普通物理学
时间：2023-12-07 13:53:58
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题目1单选题
<img src="https://tihai-oss-cloud.itihey.com/img/e91ff2a26c7284b44beeaedfd6278183.webp">、<img src="https://tihai-oss-cloud.itihey.com/img/c1fb449c83441728d0f8823fb7fa3eee.webp">两质点的质量有关系<img src="https://tihai-oss-cloud.itihey.com/img/216f3ee801d35a635d9276a0e77ccc67.webp">,受到相等的冲量作用,则( )A. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">比<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量少B. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">与<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动能增量相等C. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">比<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量大D. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">与<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量相等
题目2单选题
人造地球卫星绕地球作椭圆轨道运动.卫星轨道近地点和远地点分别为<img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">和<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">.用<img src="https://tihai-oss-cloud.itihey.com/img/75c750cc2c8219547a985d04423b1e48.webp">和<img src="https://tihai-oss-cloud.itihey.com/img/1424934950c9627bcca8334da10b2857.webp">分别表示卫星对地心的角动量及其动能的瞬时值,则应有( )A. <img src="https://tihai-oss-cloud.itihey.com/img/7127432232d5869795b787202242a5ec.webp">,<img src="https://tihai-oss-cloud.itihey.com/img/114a18b3f44f9a59a2e5fa8a79a45ff7.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/8f6a6496f9fc050975611bcfbcf96782.webp">,<img src="https://tihai-oss-cloud.itihey.com/img/e17646afd4a91687d9dfd8d76d866910.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/032bf7c1f6ecf1634031f32395f5cbe9.webp">,<img src="https://tihai-oss-cloud.itihey.com/img/52b99739883a436c75e602d9e7965ab9.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/4175bc99f282b8d4dbebcb2e0735fd6c.webp">,<img src="https://tihai-oss-cloud.itihey.com/img/e17646afd4a91687d9dfd8d76d866910.webp">
题目3单选题
一炮弹由于特殊原因在水平飞行过程中,突然炸裂成两块,其中一块作自由下落,则另一块着地点(飞行过程中阻力不计)A. 比原来更远B. 比原来更近C. 仍和原来一样远D. 条件不足,不能判定
题目4单选题
一个质点在某一过程中,所受合外力的冲量为零,则质点的动量( )A. 一定守恒B. 一定不守恒C. 不一定守恒D. 以上都不对
题目5单选题
一圆锥摆,质量为<img src="https://tihai-oss-cloud.itihey.com/img/18b78c44fc9829b53b509ff4988ceba4.webp">小球,在水平面内以角速度<img src="https://tihai-oss-cloud.itihey.com/img/b4e346b67886d07f899a9716790a0380.webp">匀速转动.在小球转动一周的过程中,小球动量增量的大小和小球所受重力的冲量大小分别等于( )A. 0,<img src="https://tihai-oss-cloud.itihey.com/img/81e5289460e3af24a3b51b24ee907d38.webp">B. 0,<img src="https://tihai-oss-cloud.itihey.com/img/a389db86185d83d0b661f0a55478a1c6.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/81e5289460e3af24a3b51b24ee907d38.webp">, 0D. <img src="https://tihai-oss-cloud.itihey.com/img/a75c289be79ef47cb3a4f7ed863015cc.webp">, 0
题目6判断题
势能的引入是以保守力作功为前提的,保守力的功等于系统势能增量的负值.A. 正确B. 错误
题目7判断题
外力对质点不做功时,质点的动能保持不变,而且一定保持静止或作匀速直线运动.A. 正确B. 错误
题目8判断题
不受外力的系统,机械能一定守恒.A. 正确B. 错误
题目9判断题
系统的外力和内力做功的总和等于系统动能的增量.A. 正确B. 错误
题目10单选题
<img src="https://tihai-oss-cloud.itihey.com/img/e91ff2a26c7284b44beeaedfd6278183.webp">、<img src="https://tihai-oss-cloud.itihey.com/img/c1fb449c83441728d0f8823fb7fa3eee.webp">两质点的质量有关系<img src="https://tihai-oss-cloud.itihey.com/img/216f3ee801d35a635d9276a0e77ccc67.webp">,受到相等的冲量作用,则( ).A. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">比<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量少B. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">与<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动能增量相等C. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">比<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量大D. <img src="https://tihai-oss-cloud.itihey.com/img/a389b31794048b545f66ce225c7a6f3e.webp">与<img src="https://tihai-oss-cloud.itihey.com/img/67f387b102bbcaadf675f2f6ede7db92.webp">的动量增量相等
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