Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are45kr/ w5/pc piaplql+ necessary for rotational equilibrium?

A. $\sum F_x = 0$

B. $\sum F_x = 0$, $\sum Torque = 0$

C. $\sum Torque = 0$

D. $\sum F_x = 0$, $\sum F_y = 0$

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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 necessary for static equilqq-ip xip4q36 box) s4f01rh 2as j*jon5m ip7ibrium?

A. $\sum F_x = 0$

B. $\sum F_x = 0$, $\sum F_y = 0$, $\sum Torque = 0$

C. $\sum Torque = 0$

D. $\sum F_x = 0$, $\sum F_y = 0$

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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 force on thg2 bw;,9z m(higzyf)le book i,ig 2(zfmy h)9gzwl; bs

A. 0 N.

B. 6 N.

C. 9.8 N.

D. -6 N.

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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 i ,da x:n a6jzin353lsouter space with a constant velocity of 9.8 m/s. What net fal sxzjn d3n:i63 a5i,orce acts on it?

A. a force equal to its weight on Earth, mg

B. a force equal to the gravity acting on it

C. The net force is zero.

D. cannot be determined without more information

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5#

( 1.0 分) 切至整卷模式搜藏此题

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 witiv 1 q+t:vr7u,vndin4 h one foot on each of two bathroom scales. Which statement is d+i1:vq iru 7t,nvdnv4efinitely true?

A. Each scale will read 800 N.

B. Each scale will read 400 N.

C. If one scale reads 500 N, the other will read 300 N.

D. None of the above is definitely true.

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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 lighjhh*+zfpu3;i 0rn6+u6 jzuoo t girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance frofh*h6+0oziunp+3ojr; u uj6z m the pivot point, what will happen to the seesaw?

A. The side the boy is sitting on will tilt downward.

B. The side the girl is sitting on will tilt downward.

C. Nothing, the seesaw will still be balanced.

D. It is impossible to say without knowing the masses and the distances.

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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 its small(*ljv( n fx1hj end is in

A. stable equilibrium.

B. unstable equilibrium.

C. neutral equilibrium.

D. positive equilibrium.

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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 hol2ppxg6g .dxkqb:,*kk+n j j5rizontal tabletop is in

A. stable equilibrium.

B. unstable equilibrium.

C. neutral equilibrium.

D. positive equilibrium.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two identical bricks, each of dimensions 20.0 cm x 10.0gi47a+e hvok ) cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out oo+hv a g)ie74kver the edge of a table. What is the maximum distance that the end of the top brick can extend beyond the table edge without toppling?

A. $7.5 \; cm$

B. $10 \; cm$

C. $12.5 \; cm$

D. $15 \; cm$

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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 supported bzcbu)2)u,fwnn(w:lh4;ag gv y three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the f ,g4l :)nhwn(wvcubau ;)2zg table's edge, will cause the table to overturn?

A. $12 \; kg$

B. $24 \; kg$

C. $36 \; kg$

D. $48 \; kg$

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Stress is

A. the strain per unit length.

B. the same as force.

C. the ratio of the change in length.

D. applied force per cross-sectional area.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Strain is

A. the ratio of the change in length to the original length.

B. the stress per unit area.

C. the applied force per unit area.

D. the ratio of stress to elastic modulus.

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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 jr94iwub+t8gcs /() x ro,gd lwires made of aluminum, brass, copper, and steel. Which wire will stretch the lea4, scr+9wgbro(gxi ldt/ u )j8st?

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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 i8oitd+ y3xy;break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we woyidoxyi ;+t83uld expect the wire to break when subjected to a minimum tension of

A. 9.0 N.

B. 18 N.

C. 36 N.

D. 108 N.

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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 the buttressing w j:4z/r4q5koixqu/5 1o yurkforce at the base of a pointed arch iskxw j54yrri51uq /:o4oz /ukq

A. less than that of a rounded arch.

B. equal to that of a rounded arch.

C. greater than that of a rounded arch.

D. zero in magnitude.

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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 distance from the fulcrum to the weight to be liffkq qdwz mt,o1xp/wmc63w1 56ted is 1.0 m/mo5311 k, qwxqw6cwm tdf p6z. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be lifted?

A. $80 \; N$

B. $100 \; N$

C. $1600 \; N$

D. $2000 \; N$

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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 weight to be lifte fr.eza.d0 w2nu jp:)a:pam r.d is 1.0. weaar2uajpn.:.) z pf0:rmd m. If a 3000 N rock is to be lifted, how much force must be exerted on the lever?

A. $600 \; N$

B. $750 \; N$

C. $3000 \; N$

D. $12000 \; N$

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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 segs q ( oz-dtzk+jb,y- /n/a9qyesaw. The boy has a mass of 75 kg and,sgq jby /zz+dtoq-(-a 9n k/y 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 sit on the other side?

A. $1.3 \; m$

B. $2.3 \; m$

C. $2.5 \; m$

D. $3.0 \; m$

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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 opposite ends of a uniform seesaw which pivots in the cen0r. - l jb-a8jmiiz9v5jf .mpkter. 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 sit for ri..-8v fijjpz mj-lbm09a5k the seesaw to balance?

A. $1.3 \; m$

B. $2.5 \; m$

C. $3.0 \; m$

D. cannot be determined without knowing the seesaw's mass

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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 supports two children weif2.p9i m mr x-8w.l:sbxvz ,w3-1ny x.plpjonghing 500 N and 350 N, respectively. If the support bpx8..w3 sl1i :n- fp, 2 x x9wvromyp.znjlm-is at the center of the board and the 500-N child is 1.5 m from the center, what is the position of the 350-N child?

A. $1.1 \; m$

B. $1.5 \; m$

C. $2.1 \; m$

D. $2.7 \; m$

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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 w ski;.bh m37m,t: ytbjeight 100 N is supported by two ropes at the ends. If a ,yjibtsk mb3 t;m7h. :400-N person sits at 2.0 m from the left end of the beam, what is the tension in the left rope?

A. $130 \; N$

B. $250 \; N$

C. $370 \; N$

D. $500 \; N$

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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 bqcca xx s.e92 +hdt,q6y 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 in the right rotax 6xe+9c .dqs2,qhcpe?

A. $130 \; N$

B. $250 \; N$

C. $370 \; N$

D. $500 \; N$

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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 up by a wire at each end*gjhwf iv6*vs* w w5l3. The scaffold is 12 m long. A 300-N box sit*jh*s fw3wgw65* vlvis 4.0 m from the left end. What is the tension in each wire?

A. left wire = 100 N; right wire = 200 N

B. left wire = 200 N; right wire = 100 N

C. left wire = 900 N; right wire = 2700 N

D. left wire = 2700 N; right wire = 900 N

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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 up1zw)- hbz pt/q by a wire at each end. The scaffold is 18 m long. A 650-N-zt)/h1 pw qzb box sits
3.1 m from the left end. What is the tension in each wire?

A. left wire = 520 N; right wire = 130 N

B. left wire = 640 N; right wire = 210 N

C. left wire = 195 N; right wire = 975 N

D. left wire = 295 N; right wire = 1000 N

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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 s wqhxw) bdx.ka,j47fe/opv7na 8z (y 0upported by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-anz qa)7h f7xkw.e opx4v8(,w0 byd/jcm marks, respectively. Where (at what mark) should a third mass of 0.30 kg be hung to keep the stick in balance?

A. $20 \; cm$

B. $25 \; cm$

C. $30 \; cm$

D. $70 \; cm$

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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 lenglsze1hw+vnu: 01m- xc4vqyv -th 8.0 m. The board is supported at each end. If the support force at the right end is thr0w-y:x4se- zuvvc h v m1+lqn1ee times that at the left end, how far from the right end is the person?

A. $4.0 \; m$

B. $2.0 \; m$

C. $1.6 \; m$

D. $6.4 \; m$

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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 u(o(z:k:k+j aq4 v4nz x8vsuaplaced between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale reads 30.0( u x:zsvqka4j knu4 8+zo(va: kg and the left scale reads 50.0 kg. How far from the right scale is the person's center of gravity located?

A. $1.20 \; m$

B. $1.23 \; m$

C. $1.26 \; m$

D. $1.30 \; m$

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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 s3oavx 0vq h5/hp7jel jkmr ,v:8 2uge)eparated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway betwe3l p0,/v 2ouxvrh ma: evq7h)ekj85jg en the poles, causing the wire to sag 2.0 m below horizontal. Assuming the wire has negligible mass, what is the tension in the wire?

A. $6.2 \; N$

B. $12 \; N$

C. $25 \; N$

D. $50 \; N$

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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 is 12 cm from thwqhu pk3 tu: p53u1baay99u: jky 1zn3e elbow-joint pivot, hyhu19jy31 ak pwuuz:3aq935bn:t k puow 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)?

本题所包含的其它图片:

A. $100 \; N$

B. 500 N

C. 1000 N

D. $1500 \; N$

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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 whe;kw mwq m1gx97el base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways an9qgkwxmw7m; 1gle at which it can be inclined without tipping over?

A. $32.6^{\circ}$

B. $39.8^{\circ}$

C. $50.2^{\circ}$

D. $57.3^{\circ}$

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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 tj4dxv,r5 h5sabout 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean beforexr5vd 5h j4ts, it becomes unstable?

A. $0.5 \; m$

B. $1.5 \; m$

C. $2.5 \; m$

D. $3.5 \; m$

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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 block7 bu;e.vr aho *eqie33 by 0.0025 cm. How much force would be needed to compress the block by 0.0125 cm?3u3reqv*ee 7 io.a; hb

A. $1000 \; N$

B. $2500 \; N$

C. $5000 \; N$

D. $25000 \; N$

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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 -wb w. ,h2cvgtand has a cross-sectional area of 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?

A. $0.01 \; m$

B. $0.10 \; m$

C. $1.0 \; m$

D. $10 \; m$

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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 uqx5k7aoxd6f 1a pme8m80w3udiameter. Young's moduluaedm8auxq7ufo85x k 16m 30pws 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?

A. $8.0 \times 10^{-7} \; m$

B. $3.2 \times 10^{-6} \; m$

C. $7.8 \times 10^{-6} \; m$

D. $3.1 \times 10^{-5} \; m$

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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 mm stretcheskpa f5.rwclr0,,, rhf by 0.20% when a 6.28-N force is applied. What is tr,p,raff0l cwh5. kr,he elastic modulus of the wire?

A. $2.5 \times 10^{10} \; N/m^{2}$

B. $1.0 \times 10^{11} \; N/m^{2}$

C. $2.5 \times 10^{12} \; N/m^{2}$

D. $1.0 \times 10^{12} \; N/m^2$

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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 ownr; 8+f7umi y0e yq 4yg19xywire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Youfn9u m10 r;q4iygx7y8y+w eyong's modulus for steel is $20 \times 10^{10} \; N/m^2$.

A. $1.5 \; cm$

B. $2.5 \; cm$

C. $3.5 \; cm$

D. $4.5 \; cm$

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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 o g;t/;ar8fp inepwd;))xef fo*1o-oan crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressur t no1 ff-8 xeraf;/*ie;;pg)podow a)e is exerted on the floor?

A. $78 \; kPa$

B. $156 \; kPa$

C. $312 \; kPa$

D. $624 \; kPa$

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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 area of 5 b wjbj*b3 ic(m52mbi$1.250 \; m^{2}$. It supports 1875 N. Find the stress on the column.

A. $1875 \; N$

B. $1875 \; N/m^2$

C. $1500 \; N/m^2$

D. $2344 \; N/m^2$

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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 diametu.1i47c u bqnlxi sg5yy s(d5k( ap59eer supports a 10.0-kg mass. What is the stress in the wire? (The Young'u us5ny p5yc .1il 9gq(k5a 47ibexd(ss modulus for aluminum is $7.0 \times 10^{10} \; N/m^2$)

A. $3.1 \times 10^{7} \; N/m^{2}$

B. $6.2 \times 10^{7} \; N/m^{2}$

C. $9.3 \times 10^{7} \; N/m^{2}$

D. $1.2 \times 10^{8} \; N/m^{2}$

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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 hqgut9)bmh 2f n.o:/ .t*d wzkmm in diameter supports a 10.0-kg mass. bn g thkzfwt u/.h)md.o q29*: What is the elongation of the wire? (The Young's modulus for an aluminum is $7.0 \times 10^{10} \; N/m^2$)

A. $0.11 \; mm$

B. $0.22 \; mm$

C. $0.33 \; mm$

D. $0.89 \; mm$

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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 400dg po)pihqw7yp/:o97 N is applied to one face of an aluminum cube with sides of 30 cm. Wwyhip 7)gq/ 9od: ppo7hat is the resulting relative displacement? (The shear modulus for aluminum is $2.5 \times 10^{10} \; N/m^2$)

A. $1.9 \times 10^{-8} \; m$

B. $4.4 \times 10^{-8} \; m$

C. $5.3 \times 10^{-8} \; m$

D. $8.2 \times 10^{-8} \; m$

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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 the pressure has incr f/yt7mf4l8gyp pxmkly0s-j q0( 7q 5ceased by 100 atmospher-4tjqp s7glf c85f/( m ym7lqyx00kypes (to 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 $2.3 \times 10^9 \; N/m^2$.

A. $2.3 \times 10^{-3} \; m^{3}$

B. $3.3 \times 10^{-3} \; m^{3}$

C. $4.3 \times 10^{-3} \; m^{3}$

D. $5.3 \times 10^{-3} \; m^{3}$

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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 diameter of 30 cm.z9 ;ok1hdkr8pinz )0j The compressive strength of steel isph0d)oink 8kzz 1r 9j; $250 \times 10^6 \; N/m^2$. What is the compression force that would break the rod?

A. $1.8 \times 10^{7} \; N$

B. $1.4 \times 10^{8} \; N$

C. $2.4 \times 10^{8} \; N$

D. $4.5 \times 10^{8} \; N$

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