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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 wejh4rrw u+0ee,pz.c3) b .hp)bh;q q shown, what is the magnitude of the torque from the applied force as measured frobqh b)4rhpcqe+ew. 3puhw,r 0j;.) z em 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 pivh*+)ogdez; g moted at the 40-cm mark. Where should one hang a mgghdm e;o)*+zass 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 cs964e n5xga +fr)nxhhm 20 mark as shown in the figure. If a pivr h6f+4nnegxh59xs a )ot 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 fir/occn,l/0*+4w0ffr;bv:s em0a.e nx gxm long plank which is pivoted about its center of mass located directmxneccfir m, 4 ;vno+f*frw:0/sxe / 00.aglbly 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 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 cen qa15sh5.2 zih4 ezdzmter of gravity. A mass M1 then is placed at the left edge of the mh5 q45za.z1isz2edhplank 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-iun0 u9zx6p8loxap6 string of length L is 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 of the torque produced by the gravitationa 9x68i6 n0upoalxup-zl 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 2hv -/ n)msqz 02-dujm rgfv+v1l7zvlside length Land width w sits on a frictionless incline of variable angle θ . Assuzq7--v zgljlf2v m v)nm 21v+s /hd0urme 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 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 staticw7xa/ p.4+ y8;uh45emlpqdnk 2veg ni equilibrium is made from two uniform beams each of mass M=12 kg. Each beam of the “V” has the same length and makes q 2nmd8x vg7phn44+5akiel pe.;/wuy 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 o v kt)2ec2cz1newl b.aq(y,+at one end affixed to the ground, is in static equilibrium A horizontal rope acts 75% of thnc ykeeb,c2l )+z1.a tw(vq2o e 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 q3-pm)w ).s fr.ivicp in static equilibrium as shown. The cable connected to the beam is massless. What are the directions of the horizontal and vertical components of forcep i)3 vrqw)pi- s..mcf acting at the pivot on the beam?



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