Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equili8o;,+dcxjo;pa wvq d hr875ev brium?

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 ne :r-r z0 ivmsm7zh-;d9b4hqm dcessary 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 held 8mlv ;cdj5.t pcfd qc4hl,v7 0at rest above your head the net force on the book isjt mcqd8h pv5,vcl lc0;4fd.7

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 with a constant velocity of 9.8 m/s. Whgoh8 nm75a r6 fr+2untat net h rn 6mrfu+2a8n57tgoforce 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 80 6 9*cuxf.aoop0 N stands with one foot on each of two bathroom scales. Which statement is defuc9opa .6o*xfinitely 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 are b.j3odq/wsxcp f.xlq5h ) xnt y8k 8q(:alanced on a massless seesaw. If they both move forward so that they are one-xjw8nf3(8q). h/lqxx:o5 d.c sqtpkyhalf their original 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 ill51h,rox2xtf0p *ng 2zgm 9hxtz.o 8ts small 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 is2jy ox1xtloo*y0 bknk*2 v+o - 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 dimension o (k4 ue+(0 x6mt/yeh7z+ ffrdsau0tns 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 phde x 6/at0z(k+7s e0rf+oumnu t(yf4roject 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 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 b k8gsdk0(gu/ky three legs placed equal distances apart on the edge. What minimum mass, placed in thgk8kk0s g(d/ue 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 m6hquvob.m-f ) ulx. 4sg f89ghade of aluminum, brass, copper, and steel. Which wire will stretch the 4sl.m .6ou h xq9f)h v8-gbgufleast?

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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 36 N. If t(i8b1t so+c fu4l; 1iihwca 0vhe wire dvi+f8 t coi;i 0sl41cu(bhw1 aiameter were half as great, we would 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 force at the base of a pointed arc0cp )+pn3kb rph ikp 0+pbp)r3c ns

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 weig;m yovk7y r5* y9v* ipk*jeb)ght to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the map7) 9mgvby;5jvk *iyyo* * ekrximum 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 dist 3v2yitx o+:fnance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much fn3+o t xvyif:2orce 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 massless65l u6 fm n2wh4ynbdf/x; lve+ seesaw. The boy has a 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 gir6u+lw xbne6 ;y nvdf4 f5lmh/2l 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 ce l* 8sl/sdmp +ca m)t.4uyl/dfnter. 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 m4p a tl)ds/ +fy8dlms/c.l *umust 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 weight 40 N supports two childreok;(zgb2z mqiq/u(t ncq6( +un weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N child is 1.5 m frk6+c /mzq gzi( nu(;o2bt q(uqom 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 Nk +r,lrrd 8)ls:zqo*gh. ec;d is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the*dcrkqr ) g8.;+lle, oh:rdz s 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 web dw0n)a43x 0/ mhbjenx9 uxf6ight 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 in the right rope?neh6 3au/0 xb9 4f0j)mwxnbdx

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. The scaffold is u7 6p8 p3. k9pmebkg,elssm3r12 m long. A 300-N box sits 4.0 m from the left end. What.gkrppe ms kl3,s7 m39u e68pb 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 wire at each enc-5zkylnrpn),n -j,o d. The scaffold is 18 m long. A 650-N bnynoz ,lpnr-5 j,ck-)ox 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 the 50-cm mar/*d73sy (ud7nv sjare/idw5mi 3) lnwk 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) should a third mass of 0.30 kg be hung to keep thed i7 /iw/ s7j3n* vylua(rsedmdw5n)3 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 8cxj7a-0w a f8bv4*yun .0 m. The board is supported at 48j bf y0n7 au-*xwavceach 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 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 separatjwn q8 5r0 ).rr:emljned by 2.00 m, and a plank of mass 4.00 kg is placed 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 kg and the left scale reads 50.0 kg. How 5:q) rl0wenjn8 .mjr rfar 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 40 m anx 6x(e nr7oyisydf)8;d connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing thy87 x (;o6rnsfi)xyed e 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 the elbowv3 o1i 0y(;u;khkk kupu a7s;mj*gd,c -joint pivot, how much force must the extensor muscle inuaph dvu31k cs0 k*j7ugyo( kik;;m,; 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 wheel base +*z (r+of flebk e :etj1:+fq:nx cu,pwidth of 2.00 m. Its center of gravity is equidistant from the sides, and positione 1kotbl zfqc:j fn+:rf++(ee pu*e x,:d 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 m5z6rar zj/rp4 tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before r5/4japzrrz6 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 khu/2ibqi0om+ hio:.a steel block by 0.0025 cm. How much force would be needed to compress the bl.h:2i/ hbomi+o qk0 iuock 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 and1e7(fiz5lv4rv9 g ;onwvrr+ *k6crqr 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 servi j;lb/cq2txjvv1; hc7 ce station is 4.0 m long and 0.20 m in diameter. Young's modulus fo7/2 1;thqlxbc; cv jvjr 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 0.20% when a 6.2ki bq tm 31ixh60t,a;y8-N force is applied. What is the elastic modulus of the wi i;h ,mbixa6 qyttk013re?

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 fro+ue;rrk6rwe0 ahq)ng oa ).j9m a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretchraeg6q;e0) +k uw a)rn9.ojrh? 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 supportsu6+)lm( q 9fw,rwbjgu all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on the floor?,u mwu+g6(9 wb qj)frl

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 a9)is./, ;,iy wc p6bwqnx yoj ppm:bj6rea 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.k w3eonxs5u2y k/ k q 1k0mq-bqpbk)970 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (Thpox/1mk -qs)qb3209ek7ubkn5wk qk ye 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 i 2aewzduwax.0ve12oj6:c r5 kn length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an alk.ea1 o6awur w 0xj2:cvde25z uminum 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 abd9 sa pxy32k y4bj3-nn aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear moduljd3 xbbp439 akysyn- 2us 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 atmosphepq 7 4zeh*)du(56b fw8lulw6 xbitn3 brex3 h6nu6u8f pbd tlw*ze4bbq()7 l5 iws (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. The compressive s.6ln.ugrxohh* .y5s :/ t6 lndkm0irxtrength of steel isyoh:ds .g6l rxhr ..x6tl5ik0u *nm/n $250 \times 10^6 \; N/m^2$. 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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