Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary foryiirjej+m 7b/o8b1a . 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 necessaryi:o,7b4aiyo3cjh 4 qc 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 t-(csiu;j8 6x.qujrws:nkwx )he book isc-(jsq n.xjr x6w;kw uui): s8

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 spcl:dmhj+f 7 rh4+mp bd+r) fr6ace with a constant velocity of 9.8 m/s. What net formp f+rcf7mdrhj+: 4h 6b+ld )rce 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+*ccpj nj vh(z 1luo24m6ux(+.ftyn lfur04 f bathroom scales. Whvn+f(tx.4 *houjff64cn u(2 uzjp 01 ly cl+mrich 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 mzvdlxa ;s:skj r1gg6o64 3 z8uassless seesaw. If they both move forward so that they are one-half their original distance from the6sj 6 ;rzak4xs1 3zg:ou dlgv8 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 is in/, hfn)m l(v:) )8 t.grm wisqsy*jnte

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 is inu36akp2 :fd z0(bdee )v xl4cb7i .ven

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 olwr 8d4q6; bikc4p/h af dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is t6 wlih q;dpbca 4kr8/4hen 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 by three legs placed equal distances vtfsxn)e5cj-4td8r no9 28ui, yp- hfapart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table ty n8fjr,)9cvst5 i 2pd n-fh48e-utxoo 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, andzpdq:+e gc v g:g6,dwwc4sl16 steel. Which wire will 16gswlqdgvzwp:dg c c:,e46 +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 subjecte djnk6he v*+ ,8athi8en, 8h4wh)tld md to minimum tension of 36 N. If the wire diameter were half as great, we wehm,,e+)6 djinl wnh8tta k h 4v8*8dhould expect 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 ofm5m 5jg-yj w ur,-iqt4i ;nc+u a pointed arch jmq4j it5ur5-+yignc, ; wm-u is

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 weight to be lifs:xp pxyzgqyjw: 1 ter: )/(z.ted is 1.0 m. If a worker pushes on t t:s ex.pqg r:/yxzjy1)z(wp:he 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 dism oxcb95l-k8km(j 4qz tance from the fulcrum to the weight to be lifted is 1.0 m. x 9ml qk4m(j-5kcob8z If 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 masslessjpi3 cr8e :3qet805g*no jsjb 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 s j j5nq 38o:jp 0it3ce*g8rbepivot 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 cen0y6j s, pjk*jzter. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. Hoz0k s pjjyj,6*w 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 tkg g)pou7kq0;m18iul wo 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 from the center, gk; kgo i7u81muql 0)pwhat 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 by two ropes at the lx14fd7exjwtmi((oz3g+. q dg . ba2gends. If a 400-N person sits at 2.0 q3 +zxwm7g4 ib(xjl 21tfdad(.o.e ggm 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 support*pq)lo :dk uvu-6hv6,sbw0 mw ed 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 the rigl u u6vw0wmhb-6,p)oqk *sd:vht 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 wi2z) cczokj/iw )a9d kg; pid/5*/ajfxre at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the le2kw gf9ciajp);ao5dc//d ji )/ zz*xkft 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 by a wire zfm0t;af,q+,oh5m.krbl 3kr at each end. The scaffold is 18 m long. A 650-N box ffqrhokk+0a,;b,rzm.ml5 3 t 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 a3j-zy//ab 5id21w+ta l voek xnd 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 l/i3z2 dao /ka1xy5- e+tb jwvof 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 8.0 m. Trdkrm-ypz (allzi gr: /nou/- y7-)- jhe 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 perszrym llu-a)-(i/z dr/-k: yjpgrn -o7on?

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. )eog x:a9eml4:2pctc00 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 plank, after which the righ:me9pc: 4 xo ag2ct)elt 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-zmk9rzvb 0 9 oqu4-jr/0 tlpa by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m below horizontavm - 09qrjrabo 0lz-k /4u9tpzl. 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 kg3 kj wph.b:oa4dga8 e- and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert bpo aek:j-. a w4hg83don 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 basea wn3)xlfpk*g 1 a;v/z width of 2.00 m. Its center of gravity is equidna xza*3 vlw kf/;p1)gistant from the 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 about 7.0 m in q jjm0kc jco*d/a(y,(diameter. The top is 4.5 m off centqjmd*o 0 k/,yccj(j a(er. 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 forcgb e+rd-.7/qhb oj6wbe would be needed to compress 6j.b dbw rb/q-h7+go ethe 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-sectional area , ehf.x c:/w6 (t5ondr-:awn ;tktpcnof 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(y ox 0kr+/9bokgqs1n;dt5ci station is 4.0 m long and 0.20 m in diameter. Young's modulus fd gs(0;xtocr1ko9y+i bn5k / qor 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-+7nymu93(i olwnpr; y2n jb0 a+juj z3N force is applied. What is the elastic modulus jl 3m9;u (0n3jzj o wyan+7r2ip+bu nyof 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 u,j*eb h c7ar1wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for steel iubje1, 7 h*racs $20 \times 10^{10} \; N/m^2$.

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 his weight ttluwp6gs wq8t w b*a; 35,zf8on the two crutch tips,q,6st;3z w 8ttb*f5p u8lw agw each of which is circular with 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 are5o by0zzp2 mi;2-unw la 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 supportsrdu ox3u od:+- a 10.0-kg mass. What is the stress in the wire? (The Younr d d-3:o+uoxug's modulus 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.fcmn x:*, a3sj0z s+4fhn. njd0 mm in diameter supports a 10.0-kg mass. What is the elongat szx30cn4+jf,* f.an njhds: mion 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 is applied to one face ofhy-o9* f w nuigfdi(:. an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for aluminum is i(*ywn9 :fo-d iu.ghf $2.5 \times 10^{10} \; N/m^2$)

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 0km,n7yb6 pke3u*vg3roni,jsea the pressure has increased by 100 atmospheres (to abou,jnpuvigb3 k* om03r6 ky,e7 nt $10^7 \; N/m^2$). 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 of steel upl6g1ts(gde4r( y;mg 9yt5e isedgmp etlg rs1yy(( 9g4;6tu5 $250 \times 10^6 \; N/m^2$. 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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