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【单选题】
一根弹性长绳沿x轴放置,左端点位于坐标原点,A点和B点分别是绳上x 1 =2 m,x 2 =5 m处的质点.用手握住绳的左端,当t=0时使手开始沿y轴做振动,在t=0.5 s时,绳上形成如图所示的波形.下列说法中正确的是( )A.
此列波的波长为 1 m,波速为4 m/s
B.
此列波为横波 ,左端点开始沿y轴正方向运动
C.
当 t=2.5 s时,质点B开始振动
D.
在 t=3.5 s后,A,B两点的振动情况总相同
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【判断题】Torque is the term used to describe a rotating force that must be result in motion.
A.
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B.
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A.
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【单选题】A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed vo. The constant horizontal force applied by the woman
A.
has the same magnitude as the weight of the box
B.
is greater than the weight of the box.
C.
has the same magnitude as the total force that resists the motion of the box
D.
is greater than the total force that resists the motion of the box
E.
is greater than either the weight of the box or the total force that resists its motion.
相关题目：
【判断题】Torque is the term used to describe a rotating force that must be result in motion.
A.
正确
B.
错误