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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 magniqv/a r+ (ondx-j b8,ijtude of the torque from the appli+j,8 (vrbdij/-q nao xed force as measured from the center 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 404x s.7hdamn3t -cm mark. Whesd3h7x .4nat mre should one hang 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 metek+w6umgb. :9 9qhxafxr stick has a 45.0 g mass placed at the cm 20 mark as shown in t9+awqb9x:h x.6 mu kfghe 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 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 very m99j,1dq bn 8.yf(p bmfid8da edge of a 6.0m long plank which is pivoted about its center of mass located directly at the. fmd1n (am,f9bdy8p89bd qi j 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 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 plank is pivoted about itse+cf6+l7 q wq*dhjjv* center of gravity. A mass M1 then is placed at the left 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*6wdq + j j+h7qelv*fc.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 lengtwh ,71 vl,m fyiztnp5)h L is located at an angle θ below the horizontal as shown in the figi,wnyh7p,1 zlv 5mtf)ure 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 rectangular solid of side length Land width w sits on aib,gbtu; :7hrv c+m jz ,(dz;d frictionless incline of variable angle θ . Assume that there is a very tiny peg preventing the box from sliding down the inclidbz(;c ibur zd,;tj h:gm+,v 7ne at the point 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 eqxogbzxa n;g9n7:g2 k8uilibrium is made from two uniform beams each of mass M=12 kg. Each beam of the “V” has the 2nkonzg ;:a7gb9x8x g 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 glly92mjaghzw, ;(:1 bkyn.wone 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 atja,2w 9wyl 1:( lbmgghyk. ;zn 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 at the hinge is in stat ak i:9/+h vzs4gyi+xfic equilibrium as shown. The cable connected to the beam is massless. What are the directions of the horizontal and vertical coik a x vi+z9yghf/4s:+mponents of force acting at the pivot on the beam?



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