2019年全国卷Ⅱ理综物理高考试题(含答案)

2019-09-22 22:10 来源: 高考学习网 本文影响了:437人

15.太阳内部核反应的主要模式之一是质子-质子循环,循环的结果可表示为,已知的质量分别为1u=931MeV/c2c为光速。在4转变成1的过程中,释放的能量约为

A8 MeV                   B16 MeV                         C26 MeV    D52 MeV

16.物块在轻绳的拉动下沿倾角为30°的固定斜面向上匀速运动,轻绳与斜面平行。已知物块与斜面之间的动摩擦因数为,重力加速度取10m/s2。若轻绳能承受的最大张力为1 500 N,则物块的质量最大为

A150 kg     B kg       C200 kg      DeqWmf183GmgAAAAAAAOADAAIBCQAAAADwXwEACQAAA60BAAAHAJUAAAAAAAUAAAACAQEAAAAFAAAAAQL/ //8ABQAAAC4BGQAAAAUAAAALAgAAAAAFAAAADAIAAuADCwAAACYGDwAMAE1hdGhUeXBlAAAwABIA AAAmBg8AGgD/////AAAQAAAAwP///6r///+gAwAAqgEAAAgAAAD6AgAAAAAAAAAAAAIEAAAALQEA AAUAAAAUAkwBGgIFAAAAEwI5ATsCBQAAABMCvwGOAgUAAAATAl4A5gIFAAAAEwJeAJMDBwAAAPwC AAAAAAACAAAEAAAALQEBAAgAAAD6AgUAAQAAAAAAAAAEAAAALQECABoAAAAkAwsAGAJIAUQCLwGO Ap8B4QJWAJMDVgCTA2YA7AJmAJYCvwGGAr8BMwJDAR0CUQEEAAAALQEAAAUAAAAJAgAAAAIFAAAA FAKgARYAHAAAAPsCsP4AAAAAAACQAQAAAAAAAgAQVGltZXMgTmV3IFJvbWFuAP7///+zGgquAAAK AAAAAAAEAAAALQEDAA0AAAAyCgAAAAAEAAAAMTAwM6gAqACGAaAClQAAACYGDwAgAUFwcHNNRkND AQD5AAAA+QAAAERlc2lnbiBTY2llbmNlLCBJbmMuAAUBAAYJRFNNVDYAARNXaW5BbGxCYXNpY0Nv ZGVQYWdlcwARBVRpbWVzIE5ldyBSb21hbgARA1N5bWJvbAARBUNvdXJpZXIgTmV3ABEETVQgRXh0 cmEAE1dpbkNoaW5hABEGy87M5S1QVUEAEgAIIQpfJ/JfIY8hL0dfQVDyHx5BUPQVD0EA9EX0JfSP Ql9BAPQQD0NfQQD0j0X0Kl9I9I9BAPQQD0D0j0F/SPQQD0EqX0RfRfRfRfRfQQ8MAQABAAECAgIC AAIAAQEBAAMAAQAEAAUACgEAAgCIMQACAIgwAAIAiDAAAwAKAAABAAIAiDMAAAsBAQAAAAoAAAAm Bg8ACgD/////AQAAAAAACAAAAPoCAAAAAAAAAAAAAAQAAAAtAQQABwAAAPwCAAAAAAAAAAAEAAAA LQEFABwAAAD7AhAABwAAAAAAvAIAAACGAQICIlN5c3RlbQAALgCKAAAACgB8FmYLLgCKAP////+Q 2BkABAAAAC0BBgAEAAAA8AEDAAMAAAAAAA== kg

17.如图,边长为l的正方形abcd内存在匀强磁场,磁感应强度大小为B,方向垂直于纸面(abcd所在平面)向外。ab边中点有一电子发射源O,可向磁场内沿垂直于ab边的方向发射电子。已知电子的比荷为k。则从ad两点射出的电子的速度大小分别为

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