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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, nhlo u el1 +s/rk/(cif:-ub.jwhat is the magnitude of the torque from the appli/1efnk+-:rbll/(co uu sih j.ed 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 40-cm mark. Whv z6ikmw7pl )/q+ykxusiqk h.0 9t0+nere should one hang a mass)qwiyv.nm/7h tx0 +q 6 kk0iu9pls +zk 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 mas1vj dib3.rj /ps placed at the cm 20 mark as shown in the figubvj j1dir /3p.re. 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 edge of a 6.0m long plank which is pivotb 7wtw,-hbh so*p(ombal5 oa-k 7n/i8ed 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 inn- 8h (o -oi,apwo7k7b* /5wb bmhlsat 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 p-udv,*6znvuex.f*ht 0m ev0c ivoted about its 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 ehnfvud, v60zu- vex0m .ct** 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 located at an angleskl)ehexq7- 1nvgih-b k)(:g 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 througi-h(b71 q gxn)lgh ek kve-s):h 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 ,m*jkf2ng1b q 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 labeled P. At what angle of incline w, *2bjqg m1fnkill 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 beam-1fuo wzg -er9s each of mass M=12 kg. Each beam of the “V” has the same lew-1fgz9-ru o ength 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, phsukc, a /w-c*ivoted 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 tau kh*,wsc c-/he 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 intk069q l:i:ul4q e9pczu:zvt static equilibrium as shown. Th:t64eu ql:plziqvz99 0:t kcue 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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