高校问答弥勒出世传奇电影:请教几道高一物理题目~!
来源：百度文库 编辑：高校问答 时间：2024/04/28 21:52:48
(1)一轻弹簧竖直放在地面,上端为O点,将质量为m的物块放在O点处,使其缓缓下落到了A处,放手后物块平衡,此过程中物块克服人的作用力做的功为W,若将物块从距弹簧O点H的高处释放,物块自由落下,落到O点后继续下落将弹簧压缩,则物块将弹簧压缩到A处时候物块速度多大?(不计能量损失)
(2)某物从倾角37度的斜面底端A沿斜面上滑,物与斜面摩擦系数为0.5,当到B时动能为E,到最高点C又滑到AB的中点D时动能也是E,已知向量AB=10m,求BC长
C／
B／
／
D／
／
A∠___________
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````C／
````````B／
````````／
````D／
````／
A∠___________
(2)某物从倾角37度的斜面底端A沿斜面上滑,物与斜面摩擦系数为0.5,当到B时动能为E,到最高点C又滑到AB的中点D时动能也是E,已知向量AB=10m,求BC长
C／
B／
／
D／
／
A∠___________
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````C／
````````B／
````````／
````D／
````／
A∠___________
(1)W= mgh
mg(H+h)-W= mv2
v= √gH
mgH=mv2