Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for p20b-nnve9 ;e jhbl*xrotational 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 nec,rbyhuj48+ 39g;t ezi p:(ozrne)(zvcub y d5essary 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 at rest above your head the net force on theqx7-u k5-slo i,k.i p-m6bvah book isb- ,k7xilu-voi.5s a hp6qkm-

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 const6icakqkzwh-os9 7:o* u,qmed;3l 7k iant velocity of 9.8 m/s. What net fooismlkoe,aq w*kz97 6uq7h; :- di3 kcrce 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 iky7bggz-6 v,h 5s 9klfoot on each of two bathroom scales. Which statement is definitely trui-5k g,y6g bsz9klv7h e?

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 seesaw. If they bo8 yk q*8e y+um*63tlgi-ajt6rhbuof2th move forward so that yy*h3-u6lu* jb g62kat8fqmr ito+ 8ethey are one-half 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 i du.cch(vcq .rs5 uxuh++gk9i539xw hs 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 horizonta)guv4 ae7d;i xl 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 dimenfft :+cwqq 2hr 7/fa-xsions 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. Wha xf7qr wt2qfh- fc+/a:t 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 by three legs placed equal distanc6o0mu/ ocsj-k8c:t)oe2c npm3tb5m b *l6skbes apart on the edge. What minimum mass, placed in the middlmcuon 5c0jp8 s) c/ebbbmsok2-m *3 kt 6olt:6e 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 alumc,bnnhfjq*.e l1 *ms8inum, brass, copper, and steel. Which wire will stretch the lensh*b 18mn.q ef* l,jcast?

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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 o,b 4zx 8gswarykh4-a8y :h:jn f 36 N. If the wire diameter were half as great, we would expect the wire to byg:48x,ha:sbz8 ran-yk4w h jreak 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 componz ixbz*3ztn5 75dywc;ent of the buttressing force at the base of a pointed arch iswtyizz *d5bx cz35n; 7

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 weights2i6xm3 ffi:hl/sb y tt/ k321gxmpu/ to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum x pyx6:gts2mif// 32b1hs3f/i ktulm 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 fuloo ;4pfvaobw:o v5qn0/8jhj; yym)/c crum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force muaojn5jo fo :b)v0o8;hq// cyym4w; vpst 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. T e:mg8h k(-n2 i+b+7jm 8s*jzln uuminhe 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 girl si 728:z gk-jmmb *l+i(mu isun h8jenn+t 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 seesa :)q qh4 yahyyew;(r1nw which 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 sh r)4eyh (:ayn ywqq;1it 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 childr6kw og6e +l i,bcus;ulae49*ten 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 from the cws*66,aekbtg;i4ol + luu e9center, 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 19)gvp(ae:y xr. 587iw/yk7qt hokh bw 00 N is supported by two ropes at the ends. If a 400-N person sits at 2.wryw5: .qby8ht e(k 7/i g7o)h9ka vxp0 m from the 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 wei:d8b 92/kqw, e.sgeg3zix qrh ght 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 th:. h2r qq/i sxed3g,gz8 wbe9ke 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 scaffold is 12 m n/ 3q xiu19*o3jcau mmlong. A 300-N box sits 4.0 m from the left end. What is the tension in each wi/ jqm313i mn*9 acoxuure?

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. Ththwcrvo:)v tn-qme7k tzc t.8*9 7 * pwl*n3nqe scaffold is 18 m long. A 650-N box sit7: v3l*qo twmt 7*.r v 9ce*wqkcnn-phn8 t)tzs
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 x;fj m5k)l3t iqu 7ea9d,* rfais supported 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) should a third mass of 0.30 kg be hung to keep the stick in balancaf rfedmakl3 jux79;ti*q5 ), e?

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 uye.n-hvr u.x/ rsvb5 -niform 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 le.vyrxh.nv u-rb/-s5eft 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 separated by 2.00 m, and a plank of mass 4.00 kg is placed betwel5bh(x k7dfet23 a (t zmowq/.en them. Each scalzh7txwoad5/ke l(tf q(.b m23e 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 40 m and connected by a wire 7me :4 ggqv90r 4jp4acdbn1,bb lg5nvpjn-j;. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag d 1rgq9b4j4;0jeg:j va7- mnnlbpn5bcgvp4, 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 g3d:pty4pqppnt -b )2 o1;hnzelbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot3t4gqyphnot)pz 2d1 bp p-;:n 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. Its ce2 ard/atkla pc.:x0 )v)rle-wnter of gravity is equidistant from the sides, and posiacxrraw/l-)). ptv2:l0da ketioned 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 Pllebcn: +tmp-4w d *k3isa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m w-ldm3nck*tb: +4 elpoff center. How much 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 steel block by 0.0025 cm. How much force wous7/(nkpf n*t,r t w-fsld be needed7,-*ff ks n( nwp/rtts to compress 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 a cross-secnzlykvdd0- bi* c7q2is8k q 4,wv1i3o tional 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 an 5s1:v a 5dwrxgsb/h1azc4w/bd 0.20 m in diameter. Young's modulus for steelv/d bc5a swwx g4 haz5s/r:b11 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%bdbt 18lb20+t *e vj4niuwdo 9 when a 6.28-N force is applied. What is thed*t0db b 19ot jelbu8w2 4nv+i elastic modulus 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 x/wv)3k g(ob 7x3 dwxma steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stret)m3wwg( /ovb 73xx xdkch? 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 z skio80p( scsr u wg3e,pz3;;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 flp ;sgo(cpk,i8 sz er33; zws0uoor?

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 t(v-e7qjo2sm 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 m m qlt2z7od8:/ -tcihlength and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modu2 miz: 8-/o tm7hqltdclus 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 anl:3 nzlw7bz m;d 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus fom3bzzw :;nll7r 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 apf,-otl8t w8qx plied to one face of an aluminum cube with sides of 30 cm. What is the resulting r8f8 q,tw-tx loelative 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 pre/y ie 45zz8gvtqv+wn9ssure has increased by 100 atmospheres (to vitnq +8 gw 9ze/v5yz4about $10^7 \; N/m^2$). 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/8yww9 k teq1q of steel is q/t1q8yk9w ew$250 \times 10^6 \; N/m^2$. 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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