如图所示为一列横波在某时刻的波动图象,此波中d质点到达波谷的时间比e质点早0.0

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问题:

如图所示为一列横波在某时刻的波动图象,此波中d质点到达波谷的时间比e质点早0.05s.

(1)求此列波的传播方向和波速是多大?

(2)△t=1.5s内a质点通过的路程是多少?

(3)画出从图示时刻起x=3m处质点的振动图象.

考点:简谐运动的图像横波与纵波波长、频率和波速
题型:问答题

如图所示,是小军在泸州市科技创新大赛中制作的一种简易电子台秤原理图,称量时台面上的压力压缩弹簧使金属滑动片P在变阻器R2上滑动.已知R2的最大阻值是电阻R1阻值的4倍,电源电压恒定.未称量时,滑片P刚好位于R2的最上端a点,当称量的重物变重时,电流表的示数将    (选填“变大”、“变小”或“不变”).当台面上放最大称量重物时,滑片P刚好位于变阻器R2的最下端b点,此时电流表的读数为0.6A,则该电子台秤未称量时电流表的示数为    A.

题型:问答题
一个物体被竖直向上抛出后,则(  )

A.在上升过程中,物体不受力的作用

B.在下降过程中,物体受到的重力较大

C.物体上升到最高点时,所受重力为零

D.物体在整个运动过程中,所受重力的大小和方向不变

题型:问答题

女性生殖器尖锐湿疣错误的治疗是()

A.冷冻治疗

B.激光治疗

C.微波治疗

D.口服红霉素治疗

E.50%三氯醋酸治疗

题型:问答题

A typical (11) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless’ values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (12) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (13) results during expression evaluation stored at the discretion of the language implementation, and effecting parameter (14) and (15) operations through value copying.

A.assignment

B.design

C.value

D.dispatch

题型:问答题

整齐怎样区分?

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