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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 magnitude of the torque from the apzc8qmk lo fa /:c9w08yplied forc l zoc9/08km:fa8q ycwe 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. Whev(d39 d1cua jcre shoua13dvc9 uc jd(ld 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 meter stick has a 45.0 g mass placed at the cm 20 wtnxr5:)wq,*/ qp s pqmark as shown in the figure. If a pivot is placed at the 42.5cm mark and the meter stick remains horizontal in static equilibrium, ws)ww *:qn p/qq5,txprhat 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 ayi1 jao3dfb4d (36b rs 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 of the plank (x) should the mass kg M2=80 kg be placed so thata4ojbs3 b i(df1 3yrd6 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 cs gw zrvc09(s:enter 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 2.0 m closer to the center of the plank, which one of the following choicesc9(rw s0zsvg : 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 iwl0qt8j/6 g xrs 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 b/0tljw gx6 8rqy 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 a:acys(og pppa)d/jm -77 r f4l frictionless incline of variable angle θ . Assume that there is a very tif)yl7: rp/mpsa7d4-( pogacj ny 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” iyq.3tm +o9mufa q jr5/.y9phyn static equilibrium is made from two uniform beams each of mass M=12 /3u qm a9yyt9.jomh q.rf+ y5pkg. Each beam of the “V” has the 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 uniforg1.( g4ssff p52aa*yk brw7 xfm rod, pivoted at one end affixed to the ground, is in static equilibrium A horizontal rope acts 75% ofw 2sf aga15 kb(xg.y4p*sr7f f 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 hing8s55l0 rpsg dye is in static equilibrium as shown. The cable connected to the beam is massless. What are the directions of the horizontal and vertical c5p5g s lysr8d0omponents of force acting at the pivot on the beam?



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