您所在的当前位置：高中物理试题 >

动量定理

> 如图，一垒球以25m/s的水平速度向左飞向球棒，被球棒打击后以40m/s的速度反向水平飞回，设球棒与垒球的作用时间为0.01s，（设向左为正方向），则垒球的速度变化量为______，其加速度为______．

问题：

发布时间：2024-09-11

如图，一垒球以25m/s的水平速度向左飞向球棒，被球棒打击后以40m/s的速度反向水平飞回，设球棒与垒球的作用时间为0.01s，（设向左为正方向），则垒球的速度变化量为，其加速度为．

参考答案：

提问用户：yh***K12

可能感兴趣的题目：

1 北京时间2013年12月2日凌晨，中国在西昌卫星发射中心成功将嫦娥三号月球探侧器送入太空。如图所示，嫦娥三号在A点经制动进入环月圆轨道I，然后再次在A点制动将轨道I变为椭圆轨道II，使其近月点B点距月球表面大约15公里。下列说法正确的是（） A．嫦娥三号在轨道I的A点势能大于在轨道II的B点势能 B．嫦娥三号变轨前后的机械能相等 C．嫦娥三号在轨道I上的速度大于月球的第一宇宙速度 D．嫦娥三号在轨道II上A点的加速度大于在轨道I上A点的加速度
2 在△ABC中，角A、B、C所对的边分别为a、b、c，且 cosA= 1 3 ．（1）求 sin2 B+C 2 +cos2A的值；（2）若b=2，BC边上的中线AD= 3 2 求c．
3 在学校附近有如图所示的禁止鸣笛标志，目的是为了减弱噪声．这种减弱噪声的措施属于 A.在声源处减弱 B.在人耳处减弱 C.在传播过程中减弱 D.控制噪声无效
4 一物体做匀加速直线运动，加速度为4m/s 2，这就是说 ( ) A．物体速度变化量是4m/s B．每经过一秒物体的速度都增大4m/s C．任意一秒内的末速度均为初速度的4倍 D．任意时刻的瞬时速度是4m/s
5 已知函数 f(x)=sinx( 3 sinx+cosx) （1）求f（x）；（2）的最小正周期；（3）求f（x）；（4）在区间 [ π 2 ，π]（5）上的最大值和最小值．
6 完形填空。 Some years ago I was offered a writing assignment that would require three months of travel through Europe. I had been 1 a couple of times, but I could hardly 2 to know my ways around the continent. 3 , my knowledge of foreign languages was 4 to a little college French. I 5 . How would I, unable to speak the language, 6 familiar with local geography or transportation systems, conduct interviews and do 7 ? It seemed impossible, and with considerable 8 I sat down to write a letter rejecting the 9 . Halfway through, a 10 ran through my mind: you can"t learn if you don"t try. So I 11 the assignment. There were some bad 12 . But by the time I had finished the trip, I was an experienced traveler. And ever since, I have never hesitated to head for even the most 13 places, without guides or 14 advanced bookings, confident that somehow I will 15 . The point is that the new, the different, is almost by definition 16 . But each time you try something, you learn, and as the learning 17 , the World opens to you. I"ve learned to ski at 40, and flown up the Rhine River in a(n) 18 . And I know I"ll go on doing such things. It"s not because I"m braver or more daring than others. I"m not. But I"ll accept worry as another name for 19 and I believe I can 20 wonders. ( )1. A. aboard ( )2. A. claim ( )3. A. Somehow ( )4. A. accustomed ( )5. A. resigned ( )6. A. only too ( )7. A. operations ( )8. A. regret ( )9. A. request ( )10. A. reaction ( )11. A. accomplished ( )12. A. exchanges ( )13. A. remote ( )14. A. still ( )15. A. do ( )16. A. astonishing ( )17. A. comes up ( )18. A. airplane ( )19. A. goal ( )20. A. work B. abroad B. declare B. However B. added B. hesitated B. more than B. experiments B. doubt B. job B. thought B. received B. conditions B. accessible B. ever B. manage B. frightening B. shows up B. motorboat B. opportunity B. own C. away C. hope C. Instead C. limited C. trembled C. apart from C. research C. terror C. trust C. meaning C. accepted C. trips C. interesting C. even C. make C. fascinating C. piles up C. surfboard C. struggle C. win D. out D. deny D. Moreover D. suited D. suspected D. far from D. business D. disappointment D. assignment D. conflict D. resisted D. experiences D. crowded D. yet D. fit D. exciting D. steps up D. balloon D. challenge D. achieve
7 通常，人们会从噪声的产生、传播及接收三个环节控制噪声，下列措施中，属于在传播环节控制噪声的是 A.临街的房屋安装隔音玻璃 B.在医院附近禁止汽车鸣笛 C.在办公室里不能大声交谈 D.在公路两侧种植树木和花草
8 已知地球半径为R，质量为M，自转角速度为w，万有引力恒量为G，地球同步卫星距地面高度为h则 A．地面赤道上物体随地球自转运动的线速度为wR B．地球同步卫星的运行速度为wh C．地球近地卫星做匀速圆周运动的线速度为 D．地球近地卫星做匀速圆周运动的周期大于
9 我国土地资源构成中比例最大的是 A.耕地 B.林地 C.草地 D.内陆水域
10 在指定环境中，下列各组离子可以大量共存的是 [ ] A．无色溶液中：[Ag(NH 3) 2] +、K +、H +、NO 3 - B．滴加酚酞试液仍无色的溶液中：CO 3 2-、K +、ClO -、AlO 2 - C．在c(H +)/c(OH -)=1×10 13的溶液中：NH 4 +、Ca 2+、Cl -、K + D．加入铝粉后产生大量氢气的溶液中：NH 4 +、Na +、NO 3 -、 SO 4 2-

如图，一垒球以25m/s的水平速度向左飞向球棒，被球棒打击 后以40m/s的速度反向水平飞回，设球棒与垒球的作用时间为0.01s，（设向左为正方向），则垒球的速度变化量为______，其加速度为______．

可能感兴趣的题目：

如图，一垒球以25m/s的水平速度向左飞向球棒，被球棒打击后以40m/s的速度反向水平飞回，设球棒与垒球的作用时间为0.01s，（设向左为正方向），则垒球的速度变化量为，其加速度为．