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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 torqurs5i . 2eval(g*+uumrw-9lfw uwj( 9r e from the applied force as measured from 2isr9.f9*ewr(-ulgv r+ uma( uwwlj 5 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 pi enop70ewj,cw: o r/cye0*lb 2a +a,navoted at the 40-cm mark. Where should onel+a*,/n bc7 awnpy,co:oee w jre200a 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 sticjl(3w xwws8m(4 yk/eok has a 45.0 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 equilibriukoj(w s8 w4yxe3 wlm/(m, 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 f:klsse)o x5m vrv5:/odf+c ;.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 ko5 f5/v+xs:secvf :;om)k ldr g 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 center o.2jvzwjavi 20;cs1 pbf 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. Th;ia 1 czw .vsp20bv2jjis 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 y(5uejkbd wc( p0ml q2p309pwlight string of length L is located at an angle θ below the h3c p m2q 0p(ebdwwlkyp50ju(9orizontal 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 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 frictio+w (.3wyf(h(p 3n.z8 gq cylpkaspy:cnless incline of variable angle θ . Assume that there is a very tiny peg preventing t:(c.yw(slhypqcyg33fzpwk np . + a (8he 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 uniform wr8tnu; rx,d;5)tl a ebeams each of mass M=12 kg. Each beam of the “V” has the same length and makes an a5xt;ernu; w8) lad,r tngle 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 affixed to the ground, is in sta236e hsp .rv02 nbtrbmtic equilibrium A 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 θe2r2 b6tnsv3 . h0mpbr 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 xv*ed6fqi tg6od;1p3zu2aah k)+e 6fa wall at the hinge is in static equilibrium as shown. The cable coeof aqpe6f3) gavxh2u6t1 6i;d kdz*+ nnected 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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