Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary fo:0 gesl;i9fx( p5p2 9kvpus pnr 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 statico w0 fsx w1voi*;jkfy1q5.-kv 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. When2qtj7 * ews:f5-xc yr2icv4fm held at rest above your head the net force on the book mstfw-vjf27qx4:5ec*c2 i ry is

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 s8 dt5af,bg:jvrdw7u7 fk /tk/pace with a constant velocity of 9.8 m/s. What net force actrwk5du d,tvabf 7/j8 /fkgt:7s 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 footh*)wr e0detcsb:bf+ xf0bb// on each of two bathroom scales. Which statement is de)w /r0fbd0e*cf:hte/x+bb bsfinitely 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 seesaw. If they bgp:wj;7 xj 4w f1mz4kdoth move forward so that they ar ;m:z g 71kx4wjj4fdpwe 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 o m38fnhh9, lgsmall 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 ta(ma* ze op68ckbletop 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 dimensions 20.0 cm x 10.0 cm x 6.0 cm. zxc4* 8+x sojv 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 can extend beyond the table edge without to4xxs*vc zoj8+ ppling?

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 equwk9shac - g 44(wti du+j0p*lxal distances apart on the edge. What minimum mass, placed in the middle bhgu0 dtp(kw-asci*j9+ x4 lw4etween 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 ids2vq zv9w6g r+5 aj7dfentical wires made of aluminum, brass, copper, and steel. Which wire will stretch the 6f2r +s q 9dv57gwavjzleast?

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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 tensiag iwtz g;4x55s;f7e pon of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minim 7s5gzpiw5t 4e;gxfa;um 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 componexn6/sts+d bm)nt of the buttressing force at the base of a pointed arch iss 6b nx+d)mt/s

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 thed4x ri6dcek -fs,sq 94 fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on th- fsidcse,9r x464 qkde 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 the w,lnahwjjz;x80 *brv tu.deq 1 1s ua90eight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be 1v8e1dx0ztau*; uj l.jwa0shn,b9 rqexerted 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 boyte 2k:f.iu*gi 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 *2:kui.eftgi 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 op+mg jvlli6( 7/unn (vgld t.9aposite ends of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mas( gjv/(dv.gl6 ma7lt9lu+ nins 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 t ;6 vu9ce kukrq-r/+ alxq544 nm1xhfvwo children 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 fr14qxmleu- v akh/u4 x9qc5knvr+; 6from 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 np+; s-oiknu ,weight 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from ti;p u-sko,nn+he 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 suppo*moyr5jvnlba+p gq w.1x2-ep 4j + ,ulrted 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 l-.qlm +1vjbuw5+gyan ,4 pjr*2 eoxpthe 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 11 (iur9n mtxwvy,*ac7 .yvap: 2 m long. A 300-N box sits 4.0 m from the left end. What is the tiaupay9my7tx( vr ,*n.w :c1vension 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 end. The scaffold is 18 m long. qf9gnur a/7z8g2 * jhnvpx,b:A 650-N boxj8, pgfabh*zu/2gr9:v 7 qxn n 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 mark and has -1m8ljq n4u,urxnt*q6zi bw. masses of 0.40 kg and 0.60 kg hanging at the 20-cm u r,x mbqw*-l81zji.64 untnqand 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 7t0 l p3y*f7us ,varoyw3 fz:7lm5t vquniform board of weight 100 N and length 8.0 m. The board is supported at each end. If the support force at the right7q3 :, vrzwtas fluvf73py mo7t5l0*y 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 separated by 2n09 lzo + oew5um62kn4jk4o .4b fgzck.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 p46+9g.j no2fobwzco 4l54m u k0nkzkelank, 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 connectedu c*cn9lhuk;jx2*1 h1doo jjs.xt c:- by a wire. A bird of mass 0.50 kg lands on the wire midway betweenjj.h :21scolk-o 1d j*;nu9cuc *xhxt 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(uul vl x2p(.d9yt v8s is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper ar((u xpv8.uy92lvtl sd m 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 basb iz/dyrx+t68 xds 4-qe width of 2.00 m. Its center of gravity is equidistant from th8ds t4yrixbq dx/+z- 6e sides, and positioned 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 m tall and 45eko fkh*wp72 z)fyxabout 7.0 m in diameter. The top is 4.5 m off center. How much farther 7xokf) 4 we*2pyk h5zfcan 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 force3zv 87 2h-pqxdral: sxsd.w,y would be needed to compress the block by 0.012 a-8l,p 2vhz:d rxqxsd3y.w s75 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 areav w)2:djoto0 x 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 dia o-dmz9h0bsz(ygo /,p nab7:o meter. Young's modulus for7bnosgazpod b(y/9m0z o: -h, 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. je tft3mmlrd de-v3f6 .*: db3 What is the elastic modulus of the jvetfb 6r-3.tfm3*d led 3d:mwire?

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 anzqt;awvni(c9 re1 z;3d length 11.2 m. How much will the wire stretch? The Young's modul;(rv9wz3zta ; cieqn1us 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 cru ei 0syxw 8ozuq)+o-, kui4d:otches supports all his weight on the two crutch tips, each of which is circular with a diameter s8 :0oe- o+y4kdiz,iuuwqx o) 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 3o3tfw t1k v/v0 j4gc*7y(3ovsuy q nban 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 aey *37n+vn z9+p qp5zdn *wd9nnjgby) nd 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modegq7jp) wb v9+p nd9nyz+ y*n*n 5d3nzulus 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 suppv7/ dunls s:v.wad6r1orts a 10.0-kg mass. What is the elo7awuv:d 1/s v.rnsld6ngation of the wire? (The Young'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 i nqk+cr 9fij1-urqd(qgi, (:v s applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus fornvj1qkr,cidqru i -9g(+f:(q 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 pref 1jmm j,dg-:a(dwoo 1ssure has increased by 100 atmospheres (to about ,mo 1-m 1jfd g:wd(oaj$10^7 \; N/m^2$). 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 o6uy+5a0zoz5 (zwkbt ko* kl :compressive strength of steel is 6w5*zzkkbl+yoz (t5u ako: o 0$250 \times 10^6 \; N/m^2$. 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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