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质点沿x轴运动的v﹣t图象如图所示,规定向右为正方向,t=0时,质点位于x=2m的位置,则t=8s时质点位于 ( )
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质点做直线运动的v---t图象如图所示规定向右为正方向则该质点在前8s内平均速度的大小和方向分别为
0.25 m/s 向左
0.25 m/s 向右
1 m/s 向右
1m/s 向左
如图所示位于原点O.处的波源在t=0时刻从平衡位置在x轴上开始沿y轴正方向做周期为T.的简谐运动该波
质点P.开始振动的方向沿y轴正方向
质点P.振动周期为T. ,振动速度的最大值为v
若某时刻波源在波谷,则质点P.也一定在波谷
若某时刻质点P.在波峰,则波源在也一定在波峰
如图所示是一列简谐波在t=0时刻的波动图象已知这列波是沿x轴正方向传播波速为20m/s则下列说法正确
质点P.做简谐运动的振幅是8cm
在t=0.126s时刻,质点P.的速度方向沿y轴正方向
在t=0.15s时刻,质点P.的速度正在减小
在t=0.15s时刻,质点P.的加速度正在减小
一质点沿x轴做直线运动其v﹣t图象如图所示.质点在t=0时位于x=5m处开始沿x轴正向运动.当t=8
x=3m
x=8m
x=9m
x=14m
质点做直线运动的v-t图象如图所示规定向右为正方向则该质点在前8s内平均速度的大小和方向分别为
0.25 m/s 向右
0.25 m/s 向左
1 m/s 向右
1 m/s 向左
一质点自x轴原点O.出发沿正方向以加速度a运动经过t0时间速度变为v0接着以-a加速度运动当速度变为
质点一直沿x轴正方向运动
质点在x轴上原点O.两侧往复运动
质点运动过程中离原点的最大距离小于v
0
t
0
质点最终静止时离开原点的距离一定大于
v
0
t
0
如图所示两列简谐横波分别沿x轴正方向和负方向传播两波源分别位于x=-0.2m和x=1.2m处两列波的
=2cm.图示为t=0时刻两列波的图象(传播方向如图所示),此刻平衡位置处于x=0.2m和x=0.8m的P.、Q.两质点刚开始振动.质点M.的平衡位置处于x=0.5m处,关于各质点运动情况判断正确的是
A.t=1s时刻,质点M.的位移为-4cm
t=1s时刻,质点M.的位移为4cm
t=0.75s时刻,质点P.、Q.都运动到M.点
质 点P.、Q.的起振方向都沿y轴正方向
如图所示两列简谐横波分别沿x轴正方向和负方向传播两波源分别位于x=-0.2m和x=1.2m处两列波的
=2cm。图示为 t=0时刻两列波的图象(传播方向如图所示),该时刻平衡位置位于 x=0.2m 和 x=0.8m 的 P.、Q 两质点刚开始振动,质点 M 的平衡位置处于 x=0.5m 处。关于各质点运动情况的判断正确的是( )
A. t=0 时刻质点 P.、Q 均沿 y 轴正方向运动
t=1s 时刻,质点 M 的位移为-4cm
t=1s 时刻,质点 M 的位移为+4cm
t=0.75s 时刻,质点 P.、Q 都运动到 x=0.5m
—质点沿x轴做直线运动其v-t图像如图所示质点在t=0时位于x=3m处开始沿x轴正方向运动当t=7s
x = 3.5m
x= 6.5m
x = 9m
x=11.5m
质点做直线运动的v-t图象如图所示规定向右为正方向则该质点在前8s内平均速度的大小和方向分别为
0.25m/s,向右
0.25m/s,向左
1m/s,向右
1m/s,向左
某质点做直线运动的v~t图象如图所示规定向右为正方向则该质点在前8s内平均速度的大小和方向分别为
0.25m/s 向右
0.25m/s 向左
1m/s 向右
1m/s 向左.
质点做直线运动的vt图象如图所示规定向右为正方向则该质点在前3s内平均速度的大小和方向分别为
0.25 m/s 向右
0.25 m/s 向左
1 m/s 向右
1 m/s 向左
质点做直线运动的v—t图象如图所示规定向右为正方向则该质点在前8s内平均速度的大小和方向分别为
0.25m/s 向右
0.25m/s 向左
1m/s 向右
1m/s 向左
一质点沿x轴做直线运动其v﹣t图象如图所示.质点在t=0时位于x=5m处开始沿x轴正向运动.当t=8
x=3m
x=8m
x=9m
x=14m
一质点沿x轴做直线运动其v﹣t图象如图所示.质点在t=0时位于x=8m处开始沿x轴正方向运动.当t
x=4m
x=14m
x=24m
x=34m
质点做直线运动的v-t图象如图所示规定向右为正方向则该质点在前8s内位移和路程分别为
位移大小为2m,方向向右,路程为5m
位移大小为2m,方向向左,路程为8m
位移大小为3m,方向向左,路程为8m
位移大小为3m,方向向右,路程为5m
质点做直线运动的v-t图象如图所示规定向右为正方向则该质点在前8s内位移和路程分别为
;位移大小为2m,方向向右,路程为5m
;位移大小为2m,方向向左,路程为8m
;位移大小为3m,方向向左,路程为8m
;位移大小为3m,方向向右,路程为5m
如图所示是一列沿着x轴正方向传播的横波在t=0时刻的波形图已知这列波的周期T=2.0s下列说法正确的
这列波的波速v=2.0 m/s
在t=0时,x=0.5m处的质点速度为零
经过2.0s,这列波沿x轴正方向传播0.8m
在t=0.3s时,x=0.5m处的质点的运动方向为y轴正方向
一质点自x轴原点出发沿正方向以加速度a加速经过t0时间速度变为v0接着以-a加速度运动当速度变为-v
质点一直沿x轴正方向运动
质点将在x轴上一直向前运动
质点最终静止时离开原点的距离一定大于v
0
t
0
质点运动过程中离原点的最大距离为v
0
t
0
一列简谐横波沿x轴传播t=0时刻的波形如图甲所示此时质点P.正沿y轴负方向运动其振动图象如图乙所示则
沿x轴负方向,60 m/s
沿x轴正方向,60 m/s
沿x轴负方向,30 m/s
沿x轴正方向,30 m/s
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