Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equilibrium?blo7 h9rz)y 0ty1trniw7op 7 2

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 equilibro07 s aim/ c9 dy69,wtppphe9kium?

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. .v wi0q3kv bhgznkc l-ht7d b ye+591-When held at rest above your head the net force on the book d+5vzg3 9vhb1i-cbte kn0y l7.-kwq his

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 outer space w;pr vynq+1o hgjd t+ma/pt2 g 5)5m(tnith a constant velocity of 9.8 m/s. What net force acqm/552+ tayp(1t tnph);ngogjmdvr+ts 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 with one foot on each of two bathroom sgd(-(q9xjezhj e21oscales. Which jeq(zsdej o1(gh 2 -x9statement is definitely 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 light girl a0unn7m1cqq26g;y1xrb( ls uje 7)yn pre balanced on a massless seesaw. If they both move forward so that they are one-half their orig ngcsbx2l7mn ;p1u 7rjq1y)ny0e 6uq(inal distance from 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 dx pc1uwtze7t0107ijjle8 p2 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 horizontal tabletop eu f0qg ar 5m ms,zixs(6e:,lgbmy482is 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 2-.le6s1fao poe5 3osp0.0 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 3osa.f - sppo1ee5lo6 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 i:ow( dk dse3d7tzw i25s supported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports 2s 5w ot(3:dewd7dzkion the 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 wir01o0dbius8jh3 yhb 4h es made of aluminum, brass, copper, and steel. Whi4yu1dsbh 0hhob80 3jich wire will stretch the least?

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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 subjected to minimum tension of 36tp gl2 mias5e +n)rt8mt v28)-v7hzxs N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum te s8rgx5+27mt ))p-i2hzvm an t8etlvsnsion 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 forcerr,vy(n7 i4gjzun i4 8* x7kuas,8 hjm at the base of a pointed arch isknn(8 jmiiu,* r ahr gs8z4x7j,7v4yu

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 bd+b yvyd7ruh; h7)k9j e lifted is 1.0 m. If hvukh+yd ); ry bd7j79a 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 th 1 do r zq057go6r)v+knxts,spe fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force0s rqzr7g v son1+6) x,pdtko5 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 seesaw. The boy has a mlk9ocx 13ebeq*n a2ac:exg 86 :0scyqass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from ascc0cqe19gon le:b ex k8:326xq *aythe 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 whicdvzd;*u4s+h:yr c+l hh 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 sit for the seesaw to ur+h:v *clz+dh ;sd4y 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 weighing 500 N ap al( uf kh.6/s)az;ncr.np6and 350 N, respectively. If the support 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 .;aur(.a6 )pf salchzn/6 nkpchild?

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 weight 100 N is supported by two ropes m/pthi;c 9 :abat the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is t h9abmpi;t :/che 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 by two ropes at the ends. If1-t-i c /zlevf a 400-N person sits at 2.0 m from the left en cl e/tiv-fz-1d of the beam, what is the tension in the right rope?

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 et.n v8k g vzbl(ep6)-mnd. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each wi8) n- 6tkev.vb mz(glpre?

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 up by a wire at each end. The scav+8s4 gbd.mq+) kmjjbffold is 18 m long. A 650-N bsq j8j bmmb.d g+k+)v4ox 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 supported by a knife edge at tiycg r- kx*dzv l.l*:9k;/lnohe 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. rzc/nykx iv*.k g-*d: ll9;lo 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 /gdvd2to o*3 ya uniform board of weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end is three times that at the left end, how far do3 tgv2yd/*ofrom 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 m3lhu;qa l ovdfs-/iqo9-jjc2tg/7r n/ r60h plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person cqj;/3oa - tv96sl/7j-fg/m2rhqld0 h rouinnow lies on the plank, after which the right scale reads 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?

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 mx9;*komg0z 1jsv w,qare separated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles kzxwm v;oj1gq ms*90,, 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 CG0 z +7ruql0+c7w a:+zvszvzky is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lorl+vzz:0 z7yuv wc0s 7kz+q+awer 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 wheeldfevem 98fdtw1 ;d7/f a)0bd j base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the grou )dw d ej;/ 1ta0edvfb97mf8dfnd. What is the maximum sideways angle 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 about 7.0 m in diameter. T8 tk*e( 7qzt b:kj1iakx9bf1cm7 6 xzwhe top is 4.5 m off center. How much farther can it lean before it becomes unst(ibcx6k8tqz1 7tkazk*7e w 1 mj9f:xb able?

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 block by 0.0025 cm. How muegt 7oy 1eh6lz y61ap sb4-yp0ch force would be needed to compress the block by 0.0125 c6zgt1 e1lbs6p4e ay 0y hpoy7-m?

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 and has a0j-vkpccie -x4 :lnja*v.+yu 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 anvidg n;ctewiwxt,yv ea+ f24 yov ;2y .-.*ay1d 0.20 m in diameter. Young's modulus fote i;ow2gvi. nd4* awaey1,;c y yv2vtf-.+xyr 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 stretches by neisy xi3-d8 7lx6o,nn:y:ea 0.20% when a 6.28-N force is applied. What is the elastic modulus of thyo ai x-eel nd,y:i8:x6nsn7 3e 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 suspepj6e4 ;trbxy1nded from a steel wire of diameter 1.0 mm and length 11.2 m1x beytjr;6p4. How much will the wire stretch? The Young'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 on crutches supports all his weight ok0g,/ar0njpu7f,r mo/kk:j ns o 8m)en the two crutch tips, each of which is circular with a diameter of j0,ngkk/ r/ar8k jupn:)70sfmo m,eo4.0 cm. What pressure 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 a13 / 1j7gmuj(kzqirxrrea of $1.250 \; m^{2}$. 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 diameter supports a 10.0-kg massmsk 7 -z)iwmiie+g:h*. Whaew+ :h)imzk7gii*s m -t is the stress in the wire? (The Young's 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 mm in diameter suppo0 5m+s+za5bwxks 6 vlqv2n 0a-cj+aubrts a 10.0-kg mass. What is the elongation of the wire? (The Youn alsn av0k-s qa526jb+xz+mv 0b5w+ cug'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 400 No,0 uuq+ cnws3 is applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? 0usowu,qn3 +c(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 increased by 100 atmosph0v8,yy 7t evgwxkh ,,m/bu1 yzereyv tbuyvyz7 ,m1xg ,keh08 ,/ws (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 ha2wpbd y 6m)8ymby1 uv6s a diameter of 30 cm. The compressive strength of steel is p8 b2ydym166u b)vwm y$250 \times 10^6 \; N/m^2$. 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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