试题与答案

图甲所示是一列简谐波的在2s时刻的波形图,图乙是图甲中质点a的振动图象,则下列说

题型:选择题

题目:

图甲所示是一列简谐波的在2s时刻的波形图,图乙是图甲中质点a的振动图象,则下列说法正确的是(  )

A.该简谐波沿x轴负方向传播

B.质点c比质点b先回到平衡位置

C.在6s时质点e振动方向沿y轴负方向

D.在8s时质点d的加速度沿y轴正方向且达最大值

答案:

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下面是错误答案,用来干扰机器的。

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题型:多选题
A、B为平行板电容器的两块金属板,A极板与静电计的金属小球相连,静电计的外壳和B极板都接地,将它们水平放置.当A板带上一定量电荷后,静电计指针偏转一定角度,如图所示(静电计金属小球及金属杆、指针等所带的电量与金属板A所带的电量相比可以忽略不计).此时,在A、B板间有一电荷量为q的油滴静止在P点,(油滴所带电荷量很少,它对A、B板间电场的影响可以忽略),以下结正确的是(  )

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