【简答题】一横波在沿绳子传播时的波动方程为 . (1) 波的振幅_______m、波速______m/s、频率_______Hz、波长______m; ( 2 ) 求绳上质点振动时的最大速度________m/s(保留2位小数)。 (本填空题全部用小数填写)
【简答题】一列横波在沿绳子传播时的波动方程为y=0.20cos(2.5πt—πx)(SI),(1)求波的振幅、波速、频率及波长;(2)求绳上质点振动时的最大速度;(3)分别画出t=1s和t=2s时的波形,并指出波峰和波谷.画出x=1.0m处质点的振动曲线并讨论其与波形图的不同.
【单选题】对平板玻璃进行流通加工,玻璃利用率可从60%左右提高到85%~95%,体现了流通加工的什么作用?
【单选题】对平板玻璃进行流通加工,可以使玻璃利用率从60%左右提高到()。
【判断题】滞纳金是税务机关对未按规定期限缴纳税款的纳税人(包括扣缴义务人)按比例附加征收的金额,是对纳税人没有按期缴纳税款的一种行政处罚。
【简答题】10-9 一横波在沿绳子传播时的波动方程为 ,式中y和x的单位为m,t的单位为s. (1)求波的振幅、波速、频率及波长; (2)求绳子上的质点运动振动时的最大速度.
【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
A.
He had his son after eleven years of marriage.
B.
His son is from his wife's previous marriage.
C.
He enjoys becoming his son's close friend.
D.
His son made him talk the way a father should.
【简答题】I left eleven years later, with my school leaving certificate, and a ___(scholar) to study at Oxford.