Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions ( ) i osey/+a0 exx5)tvc4tsivare 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 y9xaxg8k)ef6cxjl ;. 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 heldv.p b;tieh5 p)b0j2aw w0oc iz4t36i8/ ubxbd at rest above your head the net force on the book iw0;w8c 2ibt. /deo60p3i zbhv xi5tju ab4 )bps

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 7nwzr( ww*2 dbouter space with a constant velocity of 9.8 m/s. What net force(27 wb*zwr wnd 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 on each of two bathroom scales. 69wg simmpopw9h 9ihw-ia01m 9.x - es Which statement is definitely trueo 9wx99gpi0s -mhm - miw91e6paih.ws?

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 seesazudjm 2e+a)1rk.zj h8 w. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to thez1hj . u+dk2zm8are)j 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 7,o/w) km/k-hn vlasjis 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 tablzg ui5k0r( j4metop 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 jhs gbf5w:7(xrr,kl 3it9 gvo, icr,(dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination, (o3i,ks ,cf9 rxhbwj7(5gl:vgirr t 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 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 bya k+yl 4b fxte,: /1/tx;ywzjb three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on thwa,/ t 4tyye zlfbk+xj/1xb:;e 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 identicaln:sva 8tkd n5o9*ld:a wires made of aluminum, brass, copper, and steel. Which wire lao5n98atvd*:knd : swill 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 i2vfz q93hktjpe gb9d,i9l-8 when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect3d f z-gkeibthpilq99 ,v28j9 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 pod l7u6g)txmcn+a9b rq/4 f 7btinted arch f67 u4mbn t+ac)bdrg/t7 9lxqis

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 th u*5ze.r2 ygqosbjt 9,pb5a a:e weight to be lifted is 1.0 m. If a worker pushes on the opposite end withojg zbtusy9 .a5*a ,pb:2rqe5 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 liftt-l* qm (e2lt9ytqz ,oed is 1.0 m. I(,yl 2 -lzqtqtme*o9t f a 3000 N rock is 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+)lud 3rlt5bfy bx-*g a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m frfb*+gt) ul lbr5xy3d-om 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 7kn, lmlc l92 f,*n*bdw /ljzjuniform seesaw which pivots in the center. Child A has mass 60 kg l2z7f/ lb ,n , 9jlmdnck**lwjand 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 weighib vqb7//g4e :hvu4 kk9vahl +f8o+lcbng 500 N and 350 N, respectively. If the support is aob u:qb4 lk++8lb9/4/ ghkchav7evvft the center of the board and the 500-N child is 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 b15/m+l ycm-h1wzn ,pk:cctj ky two ropes at the ends. If a 40mzw, hnjc 5:c k yt1+kl-1mpc/0-N person sits at 2.0 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 weight 100 N is supported by two ropu1 i meexbs7(:es at the ends. If a 400-N person sits at 2.0 m from the left end of the be(eix1sm b7 u:eam, 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+w.v *joc v1c-z5+ :fh nnsmno at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left j+1c*vnw- scohf+:5. onnzvm 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 sm1* .j+gftb: xi xo(q+y-ll sby a wire at each end. The scaffold is 18 m long. A 650-N box siolm+*j :l ysf+q .x(i1-tbsxgts
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 ,i.0of. jng, talaz/o*(otnt the 50-cm mark and has masses of 0.40 kg and 0.60 kg hangin fa0/a, onzto*(l.t i.g t,jong 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:bf,*bi/(0ccmmwqgv tw y8k4 a uniform 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 mvw0:8(y gwbq,ibfm* 4c/ktc 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 separated by 2.00 m, and a plank odrg/ yg *;arb:f 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 arbr*/gy :dg; 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. A bird of :z8s 3ex/d fnnmass 0.50 kg lands on the wire midway between the p8/nfnx 3:ezsdoles, 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 el+(u 3pyjc o.)4dua xtvbow-joint pivot, how much force must the extensor . y3x u+jacv)4dt(opu muscle in 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 width of 2.00 m. Its center of duh/ix7m9h.jw8 s1n ngravity is equidistant from the sides, and positioned 1.20 m above the ground. What ixn mi18hwh 7djns9/ u.s 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 2uepfnwfr1hm. mbd( 74 zm jwip2k9+08zy ot.about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it+ ymbf.ip.927h1 zm mkpdzwr tf08ojun (ew4 2 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. H5/e n3w g xpk,/yba+bixu67eyow much force would be needed to compress the block by 0.0w+,exe b6p53b7a nu/yk/yixg 125 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-sectx cu zu54eyet 6mod+*) qt9wd+ional 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 diamepig+ d3y(ds:gter. Young's modulu y: ddgi(s+g3ps 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 applied. ehe 2oa *sa3ase6 ;k1jWhat is the elastic modulus of the wir;j*aa 3aeoh sk1e 6es2e?

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 wirex/u.oc- i6y pb of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's mouy cbp-6x.io /dulus 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 c+o k65navye8his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What presa6ky v+n5e8 ocsure 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 aredik sru-; +p,ea 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 dinqu 72(zp tjw3yn)r);sag;/g / bzsryameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminzn3ty(rrqs 7wb);)syu2 gzgaj ;p //num 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 lenqiw )rm+.:t k7kqkeo/gth and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus fo.mkow:eqr7/kkit) +qr 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 aluminum cube with gd moq+/)xu a 2row-ad)uk;r- sides of 30 cm. What is the resulting relative displacement? (The shear modulus for am okuoqwrdaugd;+a- x)r)-2/ luminum 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 incre9ki:aa,ot;5b c )c rqbased by 100 atmospheres:o;b)bi5ca 9 tckqa,r (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 ofii4 d :ijkq 9u*jsjs.3 30 cm. The compressive strength of steel issijq:s 3i d *.k4j9uji $250 \times 10^6 \; N/m^2$. 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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