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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 of the torque/ t:fkf:z e eye is-j-i7b9l;t from the applied force as measured from the czfe: skj;/y9ie-bi el7:f t-tenter 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 / 0lc5 jvzo)h-b(jc . mhxfqiv2 .qz7h0.20 kg is pivoted at the 40-cm mark. Where should one hah vjhl5/(0q)zq2 ioz7h .b .c-fmxcvj ng 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 20 ma 32noya)a46eydn jt*rrk as shown in the figure. If a pivot is placed at the 42.5cm mark and the meter4ndt *a 6aor 2ye3)jyn 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 i g/o2qj50k +nkrjgh4h,;re7 f ha-aa ls at the very 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 or a/g+r ,j47njlfo;0 h2hkaekgqha5 -f 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 its wky;kp)tm*bx 79nz l-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 equilibriuzk)9 *y-lt x;pw kbnm7m (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 is locatep8sh lr,ru4 p).p 4blrr6t: zhd 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 thrt l .srlh6,rh8 44ppp:uz rb)rough 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 j* 40stxx,qgp sits on a frictionless incline of variable angle θ . Assume that there is a very tinys xj4 qxg*0tp, peg preventing the box from sliding down the incline 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 equilibrium is made from two /swveu2maxunz u4 *+w7p:y0w 9u j hs6uniform beams each of mass M=12 kg. Each beam of the “V” has the same length and makes an aumv*sn7 / +2yxuw6a 9s wuhjw0:e4uzpngle 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 on(l)m3ejuqsv1c pog97e end affixed to the ground, is in static equilibrium 3g1 )9omljceqp(s 7 uvA 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 at the hinge is in sta7axn0as0q t-w tic equilibrium as shown. The cable connected to the beam is massless. What are the directions of the horizontal and vertica-waxq7 asn0 0tl components of force acting at the pivot on the beam?



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