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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 f+tzg 7 )fp7cmis the magnitude of the torque from the applied fmfzf7)7gt + pcorce 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 stl: 5wlegm kin, ;i;dg*ick of mass 0.20 kg is pivoted at the 40-cm mark. Where should one hang a mass of 0.50 kg to balance the stick?gink5i,wg l :l*;me;d

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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.g1rso n.a lqm+ .hps:z;2h4vp0 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, what is the mass of the meter ag;2 4 p l+mv:hs psn.or1.zhqstick?


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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.fxu+a++, j/oqv-gtt ;kt/yzj 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 kg be placed so that the plank remains in ,/yq++ zo k+- xgfvj/t; jttaustatic 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 pivotemsk-; b/3 7jjflid:jyh rtb*8d 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 (sb7 *jhtmf lrk-j38djys /ib;:hown). 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 i(dgrp:xdo0hxes-u 0 1az 5 b1ls 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 the magnitude ofxup( hd:-bo1dg e 0ra xlz1s05 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 kc 5klyuyq(*abk 620* zi *v7/xrrqbxa frictionless incline of variable angle θ . Assume that there is a very tiny peg p*byrkkvk5b7a 6 xc0l iuqxyr/*z2q(*reventing 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 isd2jlo,g4enqkz 1: dzll9v .t.d*n3il made from two uniform beams each of mass M=12 kg. Each beam of the “V” has t9n* d2:ntqlg devlzdl1 j.lo4.i3, kzhe 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 one end ad*q s+v,idv,8n ybt5n ;1pq zjffixed to the ground, is in static equilibrium A horizontal rope acts 75% of the way up the rod while a vertical rope acts 5tbvvj +d 8;i dp *q1nn,,yszqat 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 hing yg.pu .j4zmf*1/ gpqeegf:5 ee is in static equilibrium as shown. The cable connected to the beam i q5:yjp./egefu.gp4zf g1* ems massless. What are the directions of the horizontal and vertical components of force acting at the pivot on the beam?



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