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如图所示,斜面的倾角为30°,物块A、B通过轻绳连接在弹簧测力计的两端,A、B重力分别为10N、6N,整个装置处于静止状态,不计一切摩擦,则弹簧测力计的读数为( )
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高三下学期物理《》真题及答案
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如右图所示粗糙斜面的倾角为30°轻绳通过两个滑轮与
相连,轻绳的另一端固定于天花板上,不计轻绳与滑轮的摩擦。物块A.的质量为m,不计滑轮的质量,挂上物块
后,当滑轮两边轻绳的夹角为90°时,A.B.恰能保持静止且A.所受摩擦力沿斜面向下,则物块B.的质量为( )A.
B.
m
2m
一轻弹簧两端连接着质量均为m的AB两物块A通过轻绳固定于光滑斜面的挡板上.用沿斜面的力F使B向上缓慢
B两物块,A通过轻绳固定于光滑斜面的挡板上.用沿斜面的力F使B向上缓慢移动一段距离后静止,此时弹簧处于压缩状态,轻绳仍处于伸直状态,如图所示.现撤去F,在B下滑过程中,以下说法正确的是(弹簧始终处在弹性限度内)( )
A.物块A始终保持静止
绳的拉力不可能为零
弹簧恢复原长时B的速度最大
弹簧弹性势能先减小后增大
如图所示质量分别为mAmB的
B.两物块用轻线连接放在倾角为θ的斜面上,用始终平行于斜面向上的拉力F.拉A.,使它们沿斜面匀加速上升,A.
与斜面的动摩擦因数均为μ,为了增加轻线上的张力,可行的办法是 ( ) A.减小A.物的质量 B.增大B.物的质量
增大倾角θ
增大动摩擦因数μ
如图所示斜面的倾角为30°物块
B.通过轻绳连接在弹簧测力计的两端,A.
重力分别为10N、6N,整个装置处于静止状态,不计一切摩擦,则弹簧测力计的读数为A.1N B.5N
6N
11N
如图所示
B.两物块用一根轻绳跨过定滑轮相连(不计滑轮的质量和摩擦) ,静止于斜面体两个光滑斜面上的相同高度处,两斜面的倾角分别为α=60°和β=30°。现剪断轻绳,A.
沿斜面下滑且斜面体保持静止,则从剪断轻绳到两物块着地的过程中( ) A.地面对斜面体的静摩擦力为零 B.地面对斜面体有向右的静摩擦力
A.B.两物块的重力势能的变化量相同
物块A.的重力做功的平均功率大于物块B.的重力做功的平均功率
如图所示在光滑斜面上有两个用轻质弹簧相连接的物块A.B.它们的质量均为2m弹簧的劲度系数为kC.为一
如图所示斜面的倾角为30°物块
B.通过轻绳连接在弹簧测力计的两端,A.
重力分别为10N、6N,整个装置处于静止状态,不计一切摩擦,则弹簧测力计的读数为 A.1N B.5N
6N
11N
如图所示斜面的倾角为30°轻绳通过两个滑轮与A相连轻绳的另一端固定于天花板上不计轻绳与滑轮的摩擦.
如图所示斜面的倾角为30°轻绳通过两个滑轮与A相连轻绳的另一端固定于天花板上不计轻绳与滑轮的摩擦.
如图所示一长为6L的轻杆一端连着质量为m的小球另一端固定在铰链O.处轻杆可绕铰链自由转动.一根不可伸
8分如图所示在倾角为θ的斜面上一物块可视为质点通过轻绳牵拉压紧弹簧.现将轻绳烧断物块被弹出与弹簧分离
8分如图所示在倾角为θ的斜面上一物块可视为质点通过轻绳牵拉压紧弹簧.现将轻绳烧断物块被弹出与弹簧分离
如图所示在光滑斜面上有两个用轻质弹簧相连接的物块A.B.它们的质量均为2m弹簧的劲度系数为kC.为一
如图所示
B.两物块用一根轻绳跨过定滑轮相连(不计滑轮的质量和摩擦) ,静止于斜面体两个光滑斜面上的相同高度处,两斜面的倾角分别为α=60°和β=30°。现剪断轻绳,A.
沿斜面下滑且斜面体保持静止,则从剪断轻绳到两物块着地的过程中 A.地面对斜面体的静摩擦力为零 B.地面对斜面体有向右的静摩擦力
A.B.两物块的机械能的变化量相同,重力势能的变化量不同
物块A.的重力做功的平均功率大于物块B.的重力做功的平均功率
如图所示放在粗糙斜面上的物块A和悬挂的物块B均处于静止状态轻绳AO绕过光滑的定滑轮与轻质弹簧的右端及
如图所示在光滑斜面上有两个用轻质弹簧相连接的物块A.B.它们的质量均为2m弹簧的劲度系数为kC.为一
如图所示质量分别为mAmB的
B.两物块用轻线连接放在倾角为θ的斜面上,用始终平行于斜面向上的拉力F.拉A.,使它们沿斜面匀加速上升,A.
与斜面的动摩擦因数均为μ,为了增加轻线上的张力,可行的办法是 A.减小A.物的质量 B.增大B.物的质量
增大倾角θ
增大动摩擦因数μ
如图所示等腰三角形斜面固定在水平面上一足够长的轻绳跨过斜面顶端的光滑滑轮轻绳两端系着质量分别为M.m
)斜面倾角小于θ时,两物块所受摩擦力的大小可能相等 (
)斜面倾角大于θ时,两物块所受摩擦力的大小可能相等 (
)M.不可能相对斜面向上滑动 (
)m不可能相对斜面向上滑动
如图3所示光滑斜面倾角为30°轻绳一端通过两个滑轮与
相连,另一端固定于天花板上,不计绳与滑轮的摩擦及滑轮的质量.已知物块A.的质量为m,连接A.的轻绳与斜面平行,挂上物块
后,滑轮两边轻绳的夹角为90°,A.B.恰保持静止,则物块B.的质量为 ( )
图3 A.m B.m
m
2m
如图所示倾角为θ的固定光滑斜面底部有一垂直斜面的固定档板C.劲度系数为k1的轻弹簧两端分别与挡板C.
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