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习题练习:Overweight and underweight



 作者: admin发布日期: 2024-07-30 13:17   总分: 21分  得分: _____________

答题人: 匿名未登录  开始时间: 24年07月29日 21:07  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  
  96.30: An 800-kg elevator jkbu8s7bm; ae (v+t5ub;t4qe accelerates downward at$ 2.0\;m/s^{2}$ . The force exerted by the cable on the elevator is:



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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.29: A 50-kg student stands on a scale in an elevator. At the instant the+, 9h;d7*ficx mhvw le elevator h+xl ,dvfe7 c9 hwhim;*as a downward acceleration of $1.0\; m/s^{2}$ and an upward velocity of 3.0 m/s, the scale reads approximately

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.13: Astudent weighizt6zl nowm qj55 /) kkygl2q6-c0gd4q ng 500 N stands on a bathroom scale in the school’s elevator. When the scale reads 5)5zmz-t26lc5y 6/jd qkogq0l w g4kq n20 N, the elevator must be

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.12: Astronauts in an orbiting space shuttle are “weightlexz4x d:cbarhx.o 0hxj go9w r2y36-i: ss” because

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.16: A scientist in th2+7s,osy8t grxhmhkn:)) dq ae International Space Station experiences "weightlessness" becaus to), 2k mah dq8r:ssgy7+)hnxe

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.10: A string of negligible mo2 tbw36;bn 3g+zue umass connects an object of mass M=10 kg to the ceiling of an elevator. The elevator experiences a constant downward speed of 3.0 m/s. Let Trepresent the magnitude of the force on the mass M by the string (tension), G represent the magnitude of the gravitational force by the Earth acting on the mass M hanging in the elevator, and F represent the magnitude of the net force acting on the mass M3+z2 oubgtnw3ebm6u;. Which one of the following choices describes the relationships between these forces?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.10: A string of negligible mass connects an object ,av n7ywgwr0 6of mass M=10 kg to the ceiling of an el ,yaw6vwng 0r7evator. The elevator experiences a constant downward acceleration of magnitude $6.0\; m/s^{2}$ . Let Trepresent the magnitude of the force by the string (tension) acting on the mass M, let G represent the magnitude of the gravitational force by the Earth acting on the mass M, and let F represent the magnitude of the net force acting on the mass M. Which one of the following choices describes the relationships between these forces?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.06: A 2 kg mass and a 4 kg mass on a horizontal frictionless surface are arlrg;t.g1 d kx0*y+gtu*2k7 nnffc1 b10zwoconnected by a massless string A. They are pulled horizog7wca02x zfttgb0 d l+g 1n;f nkr ryo1*.u*k1ntally across the surface by a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string B on the 2 kg mass?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.07: A 2 kg mass andhdr bc)6l /.+dxoo4s hm -uv8e a 4 kg mass on a horizontal frictionless surface are connected by a massless strinm r he8oubx-o /dv+d)c.46hlsg A. They are pulled horizontally across the surface by a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string A on the 4 kg mass?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.08: A 2 kg mass and a 4 kg mass on a horizontal frictiot;l2ql du9*e drr h+(rnless surface are connected by a massless string A. They are pulled horizontally across the surface bylduhq+;2trl9(r* e dr a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the net force on the 2 kg mass?


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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  96.33 : Two blocks X andY are in contact on a horizontal fricti 7zrgvz2v +yl.onless surface. A 36 N constant force is applied to X as.+ 7vzy2lvrzg shown to the right. The force exerted by X onY is:

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.31: Two blocks of mass 1.0 kg and 3.0 kg are connecteuc2 sew 2ja-.piaureq7b/ ,. cd by a string which has a tension of 2.0 N. A force F acts in the direction shown to the right. Assuming friction is negligible, what is the va .a-.ei,jqaec2pr/ b7us u c2wlue
ofF?


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.12: Two boxes are accam jaurm 22kq6f,ek)6elerated to the right on a frictionless horizontal surface as shown. The larger box has a mass of 9 kilograms and the smaller box has a mass of 3fau2k2kr6jma),6 eqm kilograms. If a 24 newton horizontal force pulls on the larger box, with what force does the larger box pull on the smaller box?



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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.15 : Two blocks X andY are in contact on a frictionless horizo p-i,w6yce a:intal surface. A constant 35 N force is applied to the right onto block Y. What is the magnitude of the force that w6y i :piace,-block X exerts onto blockY?



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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  94.25: One end of a massleq/+x1e6 zdye o qjty5l 0h4i0uss rope is attached to a mass m; the other end is attached to a mass of 1.00 kg. The rope is hung over a massless frictionless pulley as shown in the accompanyiq 01x0je qoy6d5t ezuh/yil+4ng figure. Mass m accelerates downward at $5.0\;m/s^{2}$. What is m?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.30 : A string with masses of 1.5 kg and 3.0 kg on its ends wi4/q,fkfb j1,nae cz: th-qe4d k6n7is hung over a frictionless, massless pulley as shown to the right. What is the approximate magnitude of the a7d jqfwkehqfeni za 4c-,61:b t,/ nk4cceleration of the masses?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.36: Two masses, m1 and m2, are connected by a 5:bfgic lz-q6cord and arranged as shown in the diagram with m1 sliding along on a frictionless surface and m2 hanging from a light frictionless pul6lbqciz-g5 :f ley. What would be the mass of the falling mass, m2, if both the sliding mass, m1, and the tension, T, in the cord were known?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.42: A small box of mass m isplaced on top of a larger+r r5evkr c;xdt7qz -ne )h*k- box of mass 2m as shown in the diagram at right. When a force F is applied to the large box, both boxes accelerate to the right with the same acceleration. The coefficient of friction between all surfaces is μ , what would be the force accelerating the sd r7 ket-+-czrhq5 ;ern*vk)xmaller mass?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.25: A box slides with uniform acceleration up an incline. The box 9n wr+0 sci8lehas an initial speed of 9.0 m/s and rises vertically 2.60 before coming to rest. If thcwn +srle09i8e angle of the incline is$30^{\circ}$, what is the coefficient of kinetic friction between the box and the incline?


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.44: A box of mass mis initially at re yc8 )q)g8f8ql6vjx dr :7: ,phcoegkist on a horizontal surface. A constant horizontal force of mg/2 is applied to the box, directed to the right. The coefficient of friction of the surface changes with the distance pufdchpq6 i:k)8ge vc y :jx)8lg8 ,oqr7shed as $μ = μ_0x$ where x is the distance from the initial location. For what distance is the box pushed until it returns to rest?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.24: A mass on a frictionless incline has a gravitatioo l4e(ucgeng bs* q2n0sn67x 6nal force,a normal force from the incline, and a force applied by a person that all are equal in magnitude. The mass remains at rest and the incline makes an angle θ counterclockwise from the horizontal. Which one of the following choices best describes the orientation of the applied force by the person? The +x-a6 c2 l4nene7 goxun60b*sq(g sxis is directed upward, parallel to the incline’s surface as shown in the figure.


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