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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: 匿名未登录  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 of thefkk-uz4r cakhr tqe/(/9 /g/r torque from the applied force as measured from the teau9/(kchrk/ 4f/ -zq /krrgcenter of the disk?




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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 kg is pivoted at the 40 fzk6qdhi8d. + w2xf79bh/ wlt-cm mark. Where should one hang 7b.9dh6wz+/d8xwlqht f k2fi a mass of 0.50 kg to balance 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 has a 45.0 g mass placed at the cm 20ggz/5o2zc :xo inakp(x 98ba. 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, what is the mass of the meter stx9go8 .gzo: c i/xk(abnap25zick?


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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 very edge of a 6.0m long plan aqwex8kb: 0k0h/ k5gek 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 kg be placed so that the plank remains in static equilibrium in a hoxk q 050ah/k8g eewbk:rizontal 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 pvc,05(eo obboi /x p.elank is pivoted about its center of gravity. A mass M1 then is placed at the leop0 o( bo/cv5b i.xe,eft edge of the plank and 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 Lkl1rc*xi- m:o *ksj7r is located at an angle θ below the ho r1l*7r i-jcok*:m kxsrizontal 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 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 rectangqql2t*j v/z(losk+c.k io + 8aular 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 po*(azll/+.o+ ock 2i8jt kvqsqint labeled 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 equi1 xce xpfp-, d f9mgqg8/x6wz7librium is made from two uniform beams each of mass M=12 kg. Each beam of tp8,-9 gq xfwmf6xd xgpz17 ec/he “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, pivoted at onefkf z0zf8xkh1l67)okbd9 l.i end affixed to the ground, is in static equilibrium bzf1z890 xd kfhk)l f7.6kloi A horizontal rope acts 75% of the way up the rod while a vertical rope acts at the 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 :p /t0gjf,ktr at the hinge is in static equilibrium as shownkg/ tfr jt:0p,. The cable connected to the beam is massless. What are the directions of the horizontal and vertical components of force acting at the pivot on the beam?



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