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习题练习：Physics Unit9: Static Equilibrium, Elasticity and Fracture
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 作者: admin    总分: 44分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月27日 22:54  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  
  What condition or condits9m5;caw, k aqions are necessary for rotational equilibrium?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What condition or conditions are necy0;xbwmjxmnj *oo2- im **h,n essary for static equilibrium?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A book weighs 6 N. When held at rest above your head the net fo9i4bp5rfft 8 5ja lc7xrce on the book is j98l fxrf5 bip4t75ac

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rocket moves through outer space w0/g3g: ehyqxsith a constant velocity of 9.8 m/s. What net force acts on itg h:03g/sxqy e?

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5#
 
  180

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person weighing 800 N stands with ong+(g v0l8x 4iha/,qkiqfdes :e foot on each of two bathroom scales. Which statement is definitely trs/ xdlaqi 0+(fggivq:8e,h 4k ue?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A heavy boy and a light girl a mum( 5.7)zgmrne77f .y.y4b tkq xwfpre balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to ttznu.(54 777e)bmpry.ffx g mw .ykqm he seesaw?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cone balanced on it y0gb v3 jpi8hp+a/gl3,74 8fkpkbwkys small end is in

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cube resting on a horizontal tabletop isgqippq -trw /+g1ec(y8j -6wi in

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two identicj;isvyub7znt k (a2,(al bricks, each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out over the edge of a table. What is the maximum distance that the end of the top brick can extend beyond the table edge without topplnjbz sva(i ; t2uy(7k,ing?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 36-kg round table is supw3e 2 s/vgsfw)g+9 qylported by three legs placed equal distances apart on th y +9qwlwv/3ssf2egg)e edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to overturn?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Stress is

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Strain is

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass is hung from identical wires 4rolo8d3m+n s;fhop4 made of aluminum, brass, copper, and steel. Which wire will stretch the leas;m+4hs 8n3 f 4dprooolt?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A copper wire is found to break when subjegbgh /*sd6c ( snhe3;wcted to minimum tension of 36 N. If the wire diagh g(;d 3/ ess6*hcwnbmeter were half as great, we would expect the wire to break when subjected to a minimum tension of

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The horizontal component of 56u-ph7nxe p yg/+ba3f,xy /l;l,kkvg k ec4gthe buttressing force at the base of a pointed arch ix 6g,kl53pe4l bgk/7+n;axykveh gu ,-/p yfcs

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lever is 5.0 m long. The distawbz(p4+/fd g6c2 gu fqwoq6+cnce from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 40gg zpwqu 6(w f+ofbc+c/4d2q60 N, what is the maximum weight that can be lifted?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lever is 5.0 m long. The distance from the fulcrum to the weigzk+:ktcs-f* )ukcvg1rulb- /ht to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much vclg1c-f/uk-kbr:u ts+k *)zforce must be exerted on the lever?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boy and a girl are balanced on a massless seesaw. The boy has a-yn +ogh;4 dpp mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of the seesaw, where must the girl s+; pgyo4nhdp -it on the other side?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two children sit on opposith tzf1-4i0gi7ew qrw0x kqo:(e ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How far from the center must child B rx(0wqt wk hzg4oi01-:fie7qsit for the seesaw to balance?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A uniform board of weight 40 N sv6-j,mtgi 2p8;mf s*n/run1rwsih1o m y.y 0 pupports two children weighing 500 N and 350 N, respectively. If the support is at the center of the board hsi-m *orinvn .u;11w,sy60yrm /f p2jp gm8tand the 500-N child is 1.5 m from the center, what is the position of the 350-N child?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-m uniform beam of wei2p k(tt1 o5qs muowb9(yq.ww9 ght 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension iyqk(m2ow 5qpt 9s9 tbw.(1ouwn the left rope?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-m uniform beam of weight 100 N is supported by two ropes at t+2b hqe x)gjrc0umw7do-45* hml wu7w he ends. If a 400-N person sits at 2.0 m from the left end of the budw0+w7m*j-w57 hrqx2gmo )e4hclub eam, what is the tension in the right rope?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A massless scaffold is held;r +l *iox)vg ye3xyc 5c8cl6.iagm9w up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each wirey6.5eg*a gio ilyw8xcrl3)vc 9+ cm; x?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-N scaffold is held up bk+4l+8wr7d) 3xzz yr3 qo6imyjmy )gxy a wire at each end. The scaffold is 18 m long. A 6507+x 8wrl4do+qr33 y)x6mz jzkmy )iyg-N box sits
3.1 m from the left end. What is the tension in each wire?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A uniform meter stick is supported by1prxs37svman;) qo/tg ;lre( a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at thxe1p go 3t7rvas(l)qrs; / ;nme 20-cm and 80-cm marks, respectively. Where (at what mark) should a third mass of 0.30 kg be hung to keep the stick in balance?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-N person stands on a uniform board of weight 100 N and length u )vfje,tx gx(()*i iy, +fntd8.0 m. The board is supported at each end. If the support force at the right end isy+,fdux (t g)f(nj t)vei*ix , three times that at the left end, how far from the right end is the person?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two scales are separated by 2.00 m, and a plank of mass 4.00 kg is pl)r;y h(1,mn 6.g ao w ,jbcgva/:jnqmzaced between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale rea(gg bqr1ajhz 6 o,n.mawj/,n)c;y: m vds 30.0 kg and the left scale reads 50.0 kg. How far from the right scale is the person's center of gravity located?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two telephone poles are separated by 40 m and connected by a wire. Albm;n) m4 ra (y pyydbr79zchz6q:8m0 bird of mass 0.50 kg lands on the wire midway between the poles, causingmy h;l6:zzdr49nbm y8c7 0ba mr)qy( p the wire to sag 2.0 m below horizontal. Assuming the wire has negligible mass, what is the tension in the wire?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Assuming the lower arm has a mass of 2.8 kg and its CG +)mq24v.h od kxpbay9 is 12 cm from the elbow-jovkodym4a.b q) x p9+2hint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig. 9-1)?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A passenger van has an outer wheel base width of 2.00 m. e0rv.c ) hy/qx Its center of gravity is equidistant from the sides, and positioned 1.20 m ab y crq.)e/vxh0ove the ground. What is the maximum sideways angle at which it can be inclined without tipping over?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Leaning Tower of Pisa is 55 m tall and about 7.0 *w32uaer 5ivbm in diameter. The top is 4.5 m off center. How much f 3u *iewr2av5barther can it lean before it becomes unstable?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 5000-N force compresses a steel b9jgzb,t rxon-s *cp))lock by 0.0025 cm. How much force would be needed to comprexr)gzojb t9 n)s,c *p-ss the block by 0.0125 cm?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cable is 100-m long and has a cross-sectional area onlsbrz0)fu9cxfv7x 4 f /( sw2f 1 $mm^{2}$. A 1000-N force is applied to stretch the cable. The elastic modulus for the cable is $1.0 \times 10^{11} \; N/m^2$. How far does it stretch?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A steel lift column in a service station is 4.0 m long and 0.20 m in diametek; +/dxoenu;p r. Young's mon+ depxk;/;ou dulus for steel is $20 \times 10^{10} \; N/m^2$. By how much does the column shrink when a 5000-kg truck is on it?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire of diameter 0.20 m1q8x. iefvb ,kw hmo57u v/10rgppng.m stretches by 0.20% when a 6.28-N force is applied. What is the elastic mvp7 1p g508k vq1xwfmb n,u/. reghi.oodulus of the wire?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass of 50 kg is suspended from a steel wire of diameter 1.0 mm aq)bvns6+*w s. cr irt1nd length 11.2itsqr )1bsc6.nv rw+* m. How much will the wire stretch? The Young's modulus for steel is $20 \times 10^{10} \; N/m^2$.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an 80-kg person walking on crutches supports +w )pwjgp/r,3 xwh-meall his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pre p )jh r3+w/mg-xep,wwssure is exerted on the floor?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bridge piling has an arehmad c73ys ;9da of $1.250 \; m^{2}$. It supports 1875 N. Find the stress on the column.

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An aluminum wire 2.0 m in length and 2.0 mm in diamete 4p,gepre-7 7m+gkdpkp 8q5kvr supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum g pq+p7k8pkmg4e, pd7re vk5-is $7.0 \times 10^{10} \; N/m^2$)

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An aluminum wire 2.0 m in length and 2.0 mm in diameter supports a 10.0-kg mas)k1pky7jr 0eqw22+xqgk p fanm) 0 ,tss. What is the elongxpkk nr e2mgqfk010 s),wa2jyp q+7)t ation of the wire? (The Young's modulus for an aluminum is $7.0 \times 10^{10} \; N/m^2$)

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A shear force of 400 N is applied to one face of an alumh8vr c o 4jhyjp8ms4 n.m-j5,linum cube with sides of 30 cm. What is the 8 m-ljrp.j,s 85vn44hoychj mresulting relative displacement? (The shear modulus for aluminum is $2.5 \times 10^{10} \; N/m^2$)

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a depth of about 1030 m in the sea tr kkgd1c urgb(9tk1 r17 ./twghe pressure has increased by 100 atmospheres (trgwkkt(ur.b /19r kdtg 17g1 co about $10^7 \; N/m^2$). By how much has $1.0 \; m^{3}$ of water been compressed by this pressure? The bulk modulus of water is $2.3 \times 10^9 \; N/m^2$.

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 55-cm brass rod has a io,,;za 5drotdiameter of 30 cm. The compressive strength of steel is;,iaz o otd5r, $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

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