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习题练习:Centre of mass system

 作者: admin 发布日期: 2024-08-07 17:28   总分: 5分  得分: _____________

答题人: 游客未登录  开始时间: 24年08月07日 15:56  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.10: A firecracker explodes while in fddi0 p05xjjt 8g*rv3 ;viay6 slight along a parabolic path and fragments from it traveling all directions. After the0i6ptixdr; 58dyvjs a*gjv3 0 explosion, the center of mass of the firecracker

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.20: A large wedge rests on a horizoy cfe9y ree)b,fe2)p5 ntal frictionless surface, as shown. A block starts from rest and slides down the inclined surface of the wedge, which ie9)f ebe2, ypyfrc5) es rough. During the motion of the block, the center of mass of the block and wedge system


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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.34: A 4.0 kg object in deep space moves at a constant vel)ork0if f8mv( .(p ai :,5bdxupi kq1yocity of 10 m/s along the +x axis. The object suddenly explodes into 2 equal k1rpy b.xva:q(d,8 pi(u )5i 0kfmf iomass pieces. Immediately after the explosion, one piece is now moving directly along the –y axis with a speed of 8.0m/s. What was the size of the impulse (in proper MKS units) provided to this piece now moving along the –y axis from the explosion?




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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.26: A 10.0 kg mass moves to the ria o/s /q4 t0eaw(-vi/ *jwzyqught at 8.00 m/s. A 5.0 kg mass moves to the left at 7eqo v/sqwa//w(4j* -tza0y i u.00 m/s. With what speed does the center of mass of this two-mass system move?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.34: A 9.20 m long uniform plank rests on a frictionless ice pond. A 52 khr5 jv 0pw)0y;k 1yxmkg box rests on the plank’s left end while a 71 kg person stands at the plank’s right end. After the person walks to the left on the plank and stands at the same location as the box, the plank has slid 3.84 mv0wyr;0j k1xkh5 yp)m to the right relative to the pond’s shore. Which one of the following choices best represents the mass of the plank?



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