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习题练习:Rotational Equilibrium

 作者: admin 发布日期: 2024-07-30 16:51   总分: 10分  得分: _____________

答题人: 游客未登录  开始时间: 24年07月30日 16:19  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  
  07.41: For the diagram shown, what is the magnitude om/edj9jr*8l)m 1.+cvmchbiyf the torque from the applied force as measured from the center of the disrd.bmmc +e/*cjhly9mv )81 jik?




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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.38: A uniform meter stick of mass 0.20 (tid; m7ib(p qkg is pivoted at the 40-cm mark. Where should one hang a mass of 0.50 kg to balance ((p;tqbi 7dim the stick?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.37: A uniform meter stick bsi(75x ex*wahas a 45.0 g mass placed at the cm 20 mark as shown in the figure. If a pivot is placed at the 42.5cm mark and the meter stick remains horizontal in static equilibrium*xewx( 5ib 7sa, what is the mass of the meter stick?


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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.16: Amass M1=40 kg is at the veart-f3lnr -4) mhk 7zkry edge of a 6.0m long plank which is pivoted about its center of mass located directly at the center of its length. How far from the center of the plank (x) should the mass kg M2=80 zrm kf-l)7 t4-a3knhrkg be placed so that the plank remains in static equilibrium in a horizontal position?



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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.20: A uniform 10.0 m long pl3d9 qk093ffuv ujigery2 o; 7whh qv1/ank is pivoted about its center of gravity. A mass M1 then is placed at the left edge of the plank and0rvui9uoh fkq 21d;3fwvqhyj/ge97 3 a second mass M2 is placed 1.0 m from the right end. This system is in static equilibrium (shown). If each mass now is moved 2.0 m closer to the center of the plank, which one of the following choices best describes the subsequent motion of the plank?



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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.34: A mass m attached to a light string of length L isqybe : 62j8i)b+8 hm/aczvc2matbhg0 located at an angle θ below the horizontal as shown in the figure to the right. The mass then is released from rest. Calculated from an axis perpendicular to the plane of the page through the pivot, which one of the following choices represents/bcv:z2g88amc e mb0yb 6+athj q2)i h the magnitude of the torque produced by the gravitational force acting on the mass at this instant?



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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.33: A uniform rectx xfyq7x1 .u+e fl6ersc( -s)rangular solid of side length Land width w sits on a frictionless incline of variable angle θ . Assume that there is a very tiny peg preventing the box from sliding down the incline at the point lab+frx6xq ) (. efeu71ylsx rsc-eled P. At what angle of incline will the box begin to tip over?




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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.49: An inverted “V” in static equilibrium is made from two uniform beams eachf69*;vq;f b-qtgz vi r of mass M=12 kg. Each beam of vr;tvq;* 6gfiz-9qbfthe “V” has the same length and makes an angle of $30^{\circ}$ with the vertical as shown in the diagram. Which one of the following choices best represents the magnitude of the static friction force acting on the left leg of the “V” from the level ground? The coefficient of static friction between each beam and the ground is $μ_s =0.76$.




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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.42: A long uniform rod, pivotci ww8s 5rv07jed at one end affixed to the ground, is in static equilibrium A horizontal rope acts 75% of the way up the rod while a vertical rope acts at th visr8075wcw je 0far end. The magnitude of each rope’s force is the same as the gravitational force acting on the rod. What is the value of the angle θ in the figure?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.43: A uniform beam connected to a wall at the hinge is in static eqsw 4ga tgil2(d*y /wajs;+pr8uilibrium as shown. The cable connected to the beam is massless. W(2 dgpja+ary/8 wws 4l*gs;i that are the directions of the horizontal and vertical components of force acting at the pivot on the beam?



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