Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or condition ynj 7s*pm6g4)+ qnmwes are 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 conditiond00abf7t 3dn3w v -abus are necessary for static equilibrium?

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 hetk dmd(n *bt9.f( i 3ct8vl2svld at rest above your head the net force on the book i.tb n8i2lv3d*mk( 9st(dfcv ts

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 outeyf6byq.s52+ c a0,f hjf ou*ear space with a constant velocity of 9.8 m/s. What net force f 2hf+ 0*b6uoyj.y,cqfeasa5 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 with one foot d9q,g 6-ofkll+azs2ku 3s +iqqxg;i4 on each of two bathroom scales. Which statement is definitely k q d;+oxq92u+z 6-3sliflg ag,kqis4true?

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 are balanced on a massleh6l6miy6):fjf q 2 lm,oyse4zss seesaw. If they both move forward so that they are one-half their original d)6smq zl2o ,eyfhmlyf j:466i istance 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 smb0vt4 ykxy.3fk i1v9jall 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 is inp e621g.fqha+o7g-r xb t- fdd

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 o) 9a(b*xzsjrqf 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 to 9*zjsqxrb )(appling?

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 by three legs placed equal distad 0ztnc5o b./gnces apart on the edge.d bgt/o0.5czn What minimum mass, placed in the middle between two supports on 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 wires made of aluminup2ax z42 wolmj,+pd s,m, brass, copper, and steel. Which wire will stretch t 42 xws2+o,adl,ppjzm he 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 subje7tsd rwe74*m8bj yj0c cted to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tes7j crwytmde4 78 0j*bnsion 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 buttrevma 9xk5do7d) ssing force at the base of a pointed arch ismd5)dv9 ako x7

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 weii op+v*u65,dxtx s(1zppmw xs06iv8s ght to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the ivwx0+86izoms1ppd5u s x ,psvx( t6 *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 lif:vec+ i0g+ i4c irlkg *b9,zl6i; brudted is 1.0 m. If a 3000 N rock , v +lb:9drkuibcc i *egg6ri;l+z40 iis 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 seesaw. The boy has a masz6e5fgwr .z8zy/p4 xr*p8p whs 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 gir 5x pzzew/*rfhzg pyr.p84 w68l 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 opposi8qsot t:2 hdo1te 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 d8t 12toho qs:B has mass 40 kg. How far from the center must child B sit for 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 weig)r;z wt 0e9ny)nsvd8 pht 40 N supports two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N child t ;))8vyn9 rpedn s0zwis 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 weight 100 N is supported by tw 9igahojo ,vbu.q -2f;o ropes at the ends. If a 400-N person sits at 2.0 m from the2bjgo;9 a ,oui-qh vf. 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 by two ropes at the v jcijc bcb fs-02-15lends. If a 400-N person sits at 2.0 m from the left end of the f- civ0l5cj12csbb j- 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 kqw9r/st3zg f x (*b r*0x9bilwire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 mix lr s3t* 0zb kf/bg9(9r*qwx 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 up by a wirc9f vg/z 9:jgje at each end. The scaffold is 18 m long. A 650-N box s9: gvz gcj9/fjits
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 supporte axh/ z*h/fz/9 k:pqtjd 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-cm marks, respectively. Where (at what mark)kqa/z t /*h9f:h/xzj p 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 length 3 huqyh.xjts/* 8 bvb23n1f 1:xw)nlivewx-d 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 from the right end is the persy1 8tbvsq/dwe *hv2l3 xh ) 1:-uf3.ninxwxbjon?

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 pl*dph,vhdg w+2 y,ohn( aced between them. Each pho+yh d*(,gnwd2h v ,scale is observed to read 2.00 kg. A person now 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 are separated by .ybqv65*iq um40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire 56.ibuq yqm*v 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,:dki0jov8omgrt ),w(ne d0f of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 k08oin v (g)w0fkdjet,o ,d m:rg 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 wheel b*vym 5wmwhbji2;zcmqy/5 +ac4w-5 evase width of 2.00 m. Its center of gravity is equidistant frm m/c-yy 5vqiz5bcjw*m 5h4 veaw w;+2om the sides, and positioned 1.20 m above the ground. 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 ab,wnomzg-h8w9sv b *5;gz6nu )kc3q qsout 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes ugs5 *s w8bz 3k nq-9z),o6c;wgvmnq hunstable?

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 muc;d;rqbph( 2,h ch6x hjh force would be needed to compress the blo,p x(;h;j 2 hbdh6crhqck by 0.0125 cm?

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 a cross-sectional zx.5j5fo qgx2 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.qz* 1fkxh k(98r 9wx1hewt/xa0 m long and 0.20 m in diameter. Young's modulus for steel isqx9h wktwx1(8 kh* /z1ex9 afr $20 \times 10^{10} \; N/m^2$. 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/vpte.b z8 :gcvjuh.4 by 0.20% when a 6.28-N force is applied. What is the elastic moduluu/b. gzpv:jt.8hvc4e s 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 wire of diameter 1.0 0 on6(kmk.xvqmm and length 11.2 m. How much willo x(m.6kn0kqv 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 hix 2vc ,no biff8:r ks67:bp0dvs weight on the two crutch tips, eacb vp:dor v,fic f8kx670n2:s bh of which is circular with a diameter of 4.0 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 area of8v6 bd7u htb:/ico0sm $1.250 \; m^{2}$. 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 dixo 4t35zkt x elgr+3/eameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum +ztg r/te4lx3e3 5xk ois $7.0 \times 10^{10} \; N/m^2$)

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 )byj24f s+lbhtc+v 7lmm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminum hvb4 )s+yj2bl7f lct+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 N is applied to one face of an aluminum cube with ny6skzyzg .otq .w+,: sides of 30 cm. What is the resulting rela so.kz,:tqw yg6.n yz+tive 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 increagt6 ih pv,rq90sed by 100 atmospheres (to abouthvtg r0qp6,9i $10^7 \; N/m^2$). 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. The compressive strength of steel ibv25t* sa+h8m,:bx.7l bhqdfs v b3ot s2*. l5va:bh,8bv3f +bts7hostdx bqm $250 \times 10^6 \; N/m^2$. 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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