Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions a+-/x0d- +w31xfojzhvf dth mere 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 equilibri2a 2d in7epbfx:z9v-num?

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 m(/ ,*uortsi po1rwz5 above your head the net force on the book ir z (u*/psotr,io15wms

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 througnp/z q5fy ec kbnz1isd9eo )5c,h8l07h outer space with a constant velocity of 9.8 m/s. What net force acts 5)z k0 e9pc /1b78nlz5no,y ifecsdqhon 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 zc/9 ixv+eu+ a m8fo4vwith one foot on each of two bathroom scales. Which sfmzai98ox4++/cvu ve tatement 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 massless seesawn++f9* ryuvrod /bp i8u5ieq x,0ep*f. If they both move forward so that they are one-piy/e0v,+ p d+r *o5e8 iufq r9nfbx*uhalf 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 its small end isigq5 mv+ mm)aj9p ;y(l66al 1 ,mpjiot 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 w0+mfou2 q (sx-x:ft cis 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, jm52sakn s-)keach of 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 c2j )k-a nmk5ssan 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 tz 1oy)f , hqh.ijq+cck3f:zmc,(w 1hc hree legs placed equal distances apart on the edge. Whhzhc fj)o: wz1cf,+c c1y,mh q3k q.(iat 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 aluminum, brass, copper, and steel1s) bk4bc-u xbzp5)tn. Which wi4k)5p1 bbtu)czsb-nx re 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 w nqp3;bhdzm1,://wtvt p/ gl N. If the wire diameter were half as great, we would expect the wire to break when subh,z w/q m/lp3t w/ptb;dgn:1 vjected 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 arzcfd:of(e- c:a/qpn ,ch zo (e d:f/-qcf:a, npcis

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 wr 0per72qaag )eight to be lifted is 1.0 m. If a worker pus2ga0qpr7)a e rhes 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 thee xa,u ;gk)9zf;hfr8 k weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how mhfugx a,r;9kf8; z)ke uch 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 massq- y8 w)fc dc ;rcq4zfpdvl,4*less seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m fromcd8f,w *4q-;qrf yccpvz4dl ) 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 centnr8 1zt3 zkr 3pdtpw00uoj,ah s0z,7uer. Child A has mass 60 kg anzu1u3z0ars r , d0wh t708ntjpo,pk3zd 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 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 hgmb hg8u;5z(N and 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 8bggm 5( uh;zhthe 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 thpwtyb p5(;ent 2q: lo-e ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the lefp l (o2ey5tqt-n;wpb:t 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. Ifm ti-ms;ig- w ch6 rlr*jm;jk jv9(6c* a 400-N person sits at 2.0 m from the left en misj6*j;-*-jtv(cmcrg6;9 w il rhmkd 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 end. The sced5lrnvo 8aez .92v:)e 5jft sbhy/1 fr,k1hqaffold is 12 m long. A 300-N box sits 4. 1h v zrvqyotresnl d1.952e58 ffeb:ha ,jk)/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 u5q .l8x4-obwxb6 u3yxbi wrr.p by a wire at each end. The scaffold is 18 m long. A 650-N b45rxx.yb68ro-lx b 3uiw qwb.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 suppoj wt w6zs(i xik)n(51o8rrnio4r -fl:rted by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hangink6wri) :- o(z8jf lin (trs5w io4r1xng 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 length khgl wzxn1cy;)gt ;43xv57egx7wa; t 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 ;g c7gax4;et;yvhx nzg w1tl 3k75xw) 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 iaf914/qk9flvf32 mioh lu4uu s placed between them. Each scale is observed to read 2.0laffkmlq2o4v u9/9 u i143hfu 0 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 sya(4m7w y s4jeeparated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire(eay7j44 mw sy 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 its CG is 12 cm from the elbow-8c,.ubcgn jnf -kt o-:joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold af k -bt,j8.c un:ngc-o 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 )wbhmc+p +o3yru(zq* outer wheel 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 u3(y hp+wcq+mo bzr* )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 7j* g-nashn6o9mowfmsg l; v5m6bx2 ), .0 m in diameter. The top is 4.5 m off center. How mubv,ow*fx nn mm-jm al6;2gs h69g)5soch farther can it lean 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 s.*ent6mmwi39 p xluv 1teel block by 0.0025 cm. How much force would be needed to compretnexm.3wi9u1 6 *lpvm ss the block 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 b3: ljv(-e :f;r2n(oh cewud *jvp2ryvgg)l7a 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 diame4i4iqs v8,87 t r i-mog-wyoziter. Y7giy o8iosi,4iwmz r-t8- vq4oung's modulus 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 stretches by 0.20% when a 6.28-N force is(p x-:dwgq cmbm30dj )+nzyj : applied. What is the elastic mop03z)jdxc( mnj-+q d g:ymw:bdulus 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 from0+zj sgi bkd;9nl,+jyi ze 8c0 a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulused+zsbi nj,09g+c j0kizy; l8 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 pe z)(d1 n(s:iw/jpltcrutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerte)n/(js p1zwelpd: (ti d 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 *uv.rd/q v*/ hbsg( guan area 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.v.uo2 ygutz8 20-kg mass. What is the stress in the wire? (The Young's mto g282. yuuvzodulus 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 suppor3d/:ke xhq,r yy6l -svtehx-ev/zozy1;l*/i ts a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminum is e /ho-r-h*yxisel /e /qky1vd6zxylzt ; 3 ,:v$7.0 \times 10^{10} \; N/m^2$)

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 applies+qgg v 5ph*u.d to one face of an aluminum cube with sides of 30 cm. What is the.ggvu+q p*s5 h 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 preb*y qdpqu+4tr vvg-s)*4u2 md ssure has increased by 100 atmospheres4 *d4pqvm)qvy+d bg* -u sr2ut (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 :s6nornvf x-rm4z. t3 compressive strength of steel is 63so.-mnnz vt4rrf:x$250 \times 10^6 \; N/m^2$. 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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