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单选题 电子的静止能量约为0.5 MeV,当其速度为0.99c时,其动能为
学科：大学物理（上）（北京工业大学）
时间：2023-05-08 12:20:20
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题目1单选题
一定量理想气体按pV3=恒量的规律膨胀,则膨胀后理想气体的温度将A. 升高B. 降低C. 不变D. 不能确定
题目2单选题
<img src="https://tihai-oss-cloud.itihey.com/img/39bfa23ee7cc44744a7e891eccd3b166.png">A. 3 mB. 9 mC. 4.5 mD. 6 m
题目3单选题
一列高速火车以速度v驶过车站,停在站台上的观测者观测到,固定在站台上相距2 m的两只机械手,同时在车厢上划出两个痕迹,则车厢上的观测者测出这两个痕迹之间的距离为A. <img src="https://tihai-oss-cloud.itihey.com/img/5713bc7446c2fea21c5ea26015fd5232.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ebe1f8836ef4da3772abef6fc0dbebf2.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/d5dfa2ca580382637e8ad9a22aaca15d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/eb331eae6fdd97265aeea65dc0633559.png">
题目4单选题
1 mol理想气体在T1=500 K的高温热源与T2=400 K的低温热源间作卡诺循环.在500 K的等温线上起始体积为V1=2l,终止体积为V1=10l,则此气体在每一循环中传给低温热源的热量Q2为A. 1.3´103 JB. 3.9´103 JC. 5.4´103 JD. 7.2´103 J
题目5单选题
气缸中有一定量的氦气(视为理想气体),经过绝热压缩,压强变为原来的2倍,则气体分子的平均速率变为原来的 倍A. <img src="https://tihai-oss-cloud.itihey.com/img/e8e92a1005e065951e783a2656caebe3.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/9dfba744fcefad073ae2c9678dcae95b.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/5ead850153cd2f45376a9de075ab5d7e.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/75324fe593c8ea9cd19d6d8a7a978cd8.png">
题目6单选题
电子的静止能量约为0.5 MeV,当其速度为0.99c时,其动能为A. 2.0 MeVB. 2.5 MeVC. 3.0 MeVD. 3.5 MeV
题目7单选题
理想气体的状态变化遵从pV2=B的规律(B为常量),则当体积由V1膨胀至2V1时,气体对外做功A为A. <img src="https://tihai-oss-cloud.itihey.com/img/47c1b25eafe30e59094fe0ae96f46b15.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/8e181bff859a87f63075302dbf09b665.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/ca692a280946d1a91613d72a2af5329e.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/3fa3b75d424a79bcd3dd782034731cda.png">
题目8单选题
<img src="https://tihai-oss-cloud.itihey.com/img/4f525c79860aab48c0cad8e43307c245.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/722b9f6df3aed8cc2e1efd5f0513786b.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/97fcfbee76957d4d3751f37ca0bc5059.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/abcb4056cf1c5b799e66417de02b133b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/37315ede4c9f2cd78ce5fb6fcd7378bd.png">
题目9单选题
细棒静止质量为m0,长度为L0,当它沿棒长方向做高速运动时,测得其长度为L,则其相对论总能量E为A. <img src="https://tihai-oss-cloud.itihey.com/img/12f70104139020f82ba570556ac98869.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/b196b3740a1e11d487d733a11d7e9ce2.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/51ea8f0632f683bd3dc7ce5a624218eb.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/90aed3e93517682b1c119a6150592a05.png">
题目10单选题
芭蕾舞演员可绕通过脚尖的垂直轴旋转,当她伸长两手时的转动惯量为J0,角速度为w0,当她突然收臂使转动惯量减少为J0/2时,其角速度为A. 2w0B. <img src="https://tihai-oss-cloud.itihey.com/img/377c24a42aa957893fad73fada0538e4.png">C. 4w0D. <img src="https://tihai-oss-cloud.itihey.com/img/84012a3454a0839faaf77231a63a8f8d.png">
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