Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions o v/jga3n;drta(ey vbj- k-2+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 conditions are necessary for static equilne0. 7qrq1cts t6 0qgvibrium?

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 cip 9h2sb4b9(h/r o ltyh.x,unet force on the book ishyl 2bh94bs.cpr,/ o(ti9xh u

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 i )z tn2r2hfrk)qwaz*, y:8no velocity of 9.8 m/s. What net forcerw)z )hnk,oi:n fq z*ya 8r22t 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 star01gs ww3ryr18 3odt-gd j,q snds with one foot on each of two bathroom scales. Whrg s r1jdotw 031 r8qw-g3,dysich statement 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 are balanced on a mass/c g mts hi58 psirx7, 9/lioc2m1ktk1ss wu65less seesaw. If they both move forward so that they are one-half their original distance from the pivot point, wha6hs1t 7i isk // p k rcgo25c,t1x89uismlm5swt 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 smalhwp l5ej3wu1w m;n.pk5ue- *bl 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 horizontalh.o/( die dg,r 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 d u/marys85r1+84 v 9ve4pyk3 emle a(,fswbynimensions 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 en1 berafy9s 8(pme485v usver/ 3+y4a kymnl,wd 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 by thr rv-8qvow.r6u2u or 8zee legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the u8o6vr or -uzv.8qrw2table'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 wires3fr ld7q s9aa9 made of aluminum, brass, copper, and steel. Whic q9l7sa far39dh 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 36 N. If tvy;5x+ptzuhr e cvv )kkh51s4 4 f4,iohe wire diameter were half as great, we would expect the wire to break when subjectfik uvh v4+ o,z;5tse1 y)h5 r4kc4vxped 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 pointedpkq*sm(8mu cxwzm6f )bco,(2 arch , ws*cb2 q(k p6)mozcmum(xf8is

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 fulz27x wd8 f xy+,0rvihscrum to the weight to be lifted is 1.0 m. If a worker pushes on the oif xwd82rv s+hyz0,7xpposite 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 lifted,xzlv8e,5f0t nzb3oj ;k)ve k,aoc ,o is 1.0 m. If a 3000 N rock i5zbtk f o,ev,j0xc3 l 8aoe),oz,nv;ks 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 balt2-xv,v vp9z nanced on a massless 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 poinv v z-v2n,txp9t 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 centercne xa1 071atr. 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 fonctea 0xr71 a1r 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 weighing 500 N and 350 Nyo)rta*k f2.f , 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 o)f2afy *kt r.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 two ropes at tud3qbs9m)g t 4he ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in tusb9 d4g3 tqm)he 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 rt ahsw21d3r*1;mge)q; u h xfpopes at the ends. If a 400-N pers3 q1a2*xh; h)mte1 rfuds;p gwon sits at 2.0 m from the left end 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 kl/0 *6ekppg m0 vzxsomvw g c.*38gu4each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension 8 v /0gx.gce3m6lo msuw4pgv*kp0k*z 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 h7i(g9*eu p aqo9o3 q*m6apnfbeld up by a wire at each end. The scaffold is 18 m long. A 650-N box sits i* pfb qno3qm(gao9a96ep7u *
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 knif2gg+ 5+ r0vinoe r,3y3fye pfve edge at the 50-cm mark and has masses of 0.40 kg and 0.60 3 g+o e2,0vr5+gei 3fyyfrn vpkg 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 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 l9 emz+4e*5c:xmfpg2t8 1 yw dbz+opkuength 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 righ9:p2 +c8p zfoe 5d me4xb kg1utmzy*+wt 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 e)g5x7vud h6g 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 far from the right scale is the person's center of gravity located?5g7)xdu g e6vh

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 byqyp2h uq c.02jx:,x hw)bf7m h 40 m and connected by a wire. A bird of mass 0.50 kgu.q h, b220xcw7phxf)yjmh :q lands on the wire midway between 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 iuo4dkur .)j/its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lowerk/ u)oui d.4jr 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 width of 2.00 m. /;pddwur917x p j6 ujkIts center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum xuw79upk/;rjj6 d p 1dsideways 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. Theb0gncbvd1u1-11 s ;7 mu sdth*-ozwcv top is 4.5 m off center. How much farther can it le 0 tngod b*1 ;v--cm1usdvsw 1h1zcu7ban before 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 block by 0.00uy)(ne gb ;0fi *dwz-n1j-teo1ujzz ( 25 cm. How much force would be needed to compress the blg; ien0-ozej- nyb(ufdz(utj1w) 1 z*ock 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 area of 1h*pcq4y - 8qf)xy*lm i $mm^{2}$. 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 ine xb-:xy 5s,vny 4,/mal0l znd a service station is 4.0 m long and 0.20 m in diameter. Young's modulus for s4dy l:, s,znmv 5exnax0/ y-blteel 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 6.28-N force is applie7n9ktz 3pvl1(t xhut6d. What is the elastic modulus zu1( thn3t7k pl9tx6vof 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 mm and length 11.-)s st8 rofbsl0if)h 42 m. How much will the wire stretch? The Younb s 0ft8-foil)h)sr4sg'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 walkig-mb g6jg.f)e ng on crutches supports all his weight on the two crutch tips, each of which is circular wit6f)-g. me gjbgh 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 of 4zj3c mscaj4 (nkg4(m $1.250 \; m^{2}$. 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 diamet w0pfrr7(er (oer supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulfeor((wp 7r0r us 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 lengt qw )t2 yf7jlw.7v3 okjumd5:sh and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The qo7jj7 53k:2)tum ywwl.fd svYoung'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 N is applied to one face of an alumin myo1f (vg9 h4a;m*j36g b*zcn f3anlfum cube with sides of 30 cm. What is the resulting relative displaceme *4 van h3zl6 gban(jfyogm9*1ffm;3 cnt? (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 (y, *lkdsb9fuma4 3x hhas increased by 100 atmospheres (to abou*ahmfkudsb(x9 4, 3ylt $10^7 \; N/m^2$). 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 diamlo*mq4ur 13zom 7p8mf eter of 30 cm. The compressive strength of steel isr8m4 3qzu lomm*o1 7fp $250 \times 10^6 \; N/m^2$. 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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