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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 path as7-fcsbzyigelbac -,66 / c2kuoit -2 nd fragments frombo7-6aiz-giyces 6ku s-c f /,tbl 22c it traveling all directions. After 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 on a horizontal frictionless su*8botb0fm2i s rface, 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 bsm8*i2of t0 bof 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 velocity of 10 m/s akws );nv+z2nq long the +x axis. The object suddenly explodes into 2 equal mass pieces. Immediately after the explosion, one piece is now moving directly along the –y axis with a spe+k ;ns2)n wvqzed 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 ma-la2vt)l(z6pslt b6 5cwbg(mnz;+ pdss moves to the left at 7.00 m/s. With what speed does the center of mass of this two-mass sysb-lvbgw )a6tlp t(6l c;(+zdsm5 pz2ntem 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 i x oexp hce2lr+ +-7;; 5i+bh;nro6c tvgnif/a frictionless ice 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 +bh6 nen hv;i 5/ +ig lrocxitc7ore+ -2;pf;xthe 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 represents the mass of the plank?



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