一弹簧振子作简谐运动,当位移为振幅的一半时,其动能为总能量的
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举一反三
- 电磁场量的法向边界条件为()。 未知类型:{'options': ['[img src="http://img0.ph.126.net/EsIkaXjnKukiyimHp6dYpQ==/6630400362140980911.png"]', '[img src="http://img1.ph.126.net/Qvas15HCDc_RrWbLruYPRw==/6619063297747523047.png"]', '[img src="http://img0.ph.126.net/DRI9k3pVjDPeDmngiOgT3Q==/6630279415861923459.png"]', '[img src="http://img2.ph.126.net/IiW1SDf3LX-s_IKSk4Vpvg==/6619471216561427789.png"]'], 'type': 102}
- 若描述某二阶连续时间LTI系统的微分方程为[img=339x26]1802d5413e2ba6f.png[/img]则该系统单冲激响应[img=31x25]1802d5414638f67.png[/img]的形式为( ) 未知类型:{'options': ['[img src="http://img0.ph.126.net/XriexnI8llLzMaGU4DnpMw==/6631896797465841618.png"]', '[img src="http://img0.ph.126.net/RJfus-4_W0aDlayaOOy6Iw==/6631874807233285998.png"]', '[img src="http://img2.ph.126.net/A3EL-huCLtby0oFPywaK-A==/6631853916512358077.png"]', ''], 'type': 102}
- 一质点沿 y 方向作简谐运动,振幅为0.02m, 周期为 2s ,平衡位置在原点,且 t =0 时刻质点位于 y =0 处,且向 y 正方向运动。以此振动质点为波源,发生的横波波长为 1m ,则沿 x 轴负方向传播的横波的波函数为 未知类型:{'options': ['[img src="http://img1.ph.126.net/rJPr3shE1QCxL-9FgtWzfw==/6608188028237664985.jpg"]', '[img src="http://img1.ph.126.net/nDzihqErCaODT9kYBV08Ig==/3670715171384146372.jpg"]', '[img src="http://img0.ph.126.net/SAOGBRU23Nmx_ojIjSjX2A==/6619274403979030755.jpg"]', '[img src="http://img0.ph.126.net/CYbTNhyAdspG2l03UslKHQ==/6608804854259708727.jpg"]'], 'type': 102}
- 设[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_067016aa-77f2-4aff-bd36-e3fa5f1bd893.png"],[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_358ab06c-7f19-4ae6-ba82-424c72bd4d18.png"],则[img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2b561af0-b65d-4e5e-936b-72b15b4f0f56.png"][img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_92284d1b-6fe3-4dc1-a732-618796cd01a4.png"] A: 6 B: 10 C: 8 D: 4
- 完成反应[img src="http://nos.netease.com/edu-image/cdd304ce2b3441dc957c95dc97f8ebbf.gif"] 未知类型:{'options': ['[img src="http://nos.netease.com/edu-image/cde7e0ce62c347789314cc3c6102269d.gif"]', '[img src="http://nos.netease.com/edu-image/ba72b1e4f37e4f9ba2135b9594a37d66.gif"]', '[img src="http://nos.netease.com/edu-image/91c10f2fa69045eb8ee9e764f7ecb315.gif"]', '[img src="http://nos.netease.com/edu-image/ab1b998771134fa8b3861a4b6ce42a6d.gif"]'], 'type': 102}