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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: 匿名未登录  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 flight along a parabolic patr:w65uk1 ,3veb cyereh and fragments from it traveling all directions. Afyrebv,ck u 3ee65r :1wter the 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 a8a nh-bo4unc ),ibh,on a horizontal frictionless surface, as shown. A block starts from rest and slides down the inclined surface of the wedge, which is rough. During the motion of the block, the center of mass,n8,4 n hcabh) a-oubi 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 inyj2yp(6t s/3cws 3;iwxekm; e deep space moves at a constant velocity of 10 m/s along the +x axis. The object suddenly explodes into 2 equal mass p;s w/y wy;2kesc(ti6 x33emjpieces. 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 right at 8.00 m/s. A 5.0 kg m7d n f(4v*)bjxdmbf9vass moves to the left at 7.00 m/s. With what speed does the center of mass of this tw j7 ( 9x4)vbvff*dmdnbo-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 ( f 7ybgvtac2d2lq *3g;8gxhnice pond. A 52 kg 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 m to the right relative to the pond’s shore. Which one of the following choices best reprg7f3;va(gdnt8y g hb*xlq c22esents the mass of the plank?



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