Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditynt/w*)vz3 n/7fe mejions are 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 necessa+gcci 4erim(2 ry 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 2t*plio mx6; dg2gw, q)nk(b1qnn fs1force on the book isgi nkx;1(smbw6d*lqp)1 of22q tn gn,

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 constant veloci- kple3uxj-uqjg f*: p,4y k.yty of 9.8 m/s. What net force acts -jy u3-e*jk.uqyl f:xppgk ,4on 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 footad54. ga3gi pk on each of two bathroom scales. Which statement is definitely trugai ag4pk 5d3.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 massleh60y)fbo5n ymz-ut ,7thlh r9ss seesaw. If they both move forward so that they are one-half their origina,fu zh0-yrt 69h 5ho ylmntb)7l 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 sm ;wg/hn gf* m/tdwy+z(all 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 tabletop is in-lh dy,7bk9l9+nx*f4 wsms sj

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 6bu8c c 4uwo;*k.0 cm. One is stacked on the other, and the combination is then placed so that they project out over the edge of a t ckbcu;w8 o*u4able. 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 a-r1 ta:3ar 3l2uujpu three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two support:jrau aar t32lu3- u1ps 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 steel. u(a w +s3p+:oojy*mv e9ulhys 3zvl3; Which wire willl y(usl j:+m3w +*ooszvyea;p3 3vhu9 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 g /b9sude) svj 9a3tj/N. If the wire diameter were half as great, we would expect the wire to break when subjected to a miniu s/dsj9gje ) 9/a3btvmum 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 pointedr9 g/ttd 9q(mw arch i q9ttr md9(g/ws

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 t+fxbxdm1 x za-*w+5i/p wlks /qx 8q(wo be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what isqm8x w d*w+kqsx(-lwx5/a/zx1pi fb+ 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 (t)sn:6xnsz i the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifte:xs)nnz t( s6id, 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. f;m4-/qd;l ct6y pdkcThe 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 sit on the otm64 dtc-pfd ;q kc;/lyher 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 pivw-rh ; 9wgguo;ots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How fa-o;hwr w u;g9gr 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 Nldo b2b p7rsj 1+bl t4v/8w-ab supports two children weighing 500 N and 350 N, respectively. If the support is at the center of th 84l1/-+7l rbw jtvdb2aspbo be 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 suppor4w(d 7ilb wdu4.y/es wgo9 (dcted by two ropes at the ends. If a 400-N person sits at 2.0 m from the yb(4. wu(wwo gdcd7lds9/ie4left 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 dvyu w.y* v4a ;q*t6q+xym ;fpis supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of th;dqm* uvyt v4x*wfy6 +;pa.qy e 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 scaffold in9 xve7lj1.4n jyg8imimk( tpz- *) mgs 12 m long. A 300-N box s(nymv gxn lm)ptzj4eg8.j* 9ii1-k m7 its 4.0 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 up by a wire at each2-+e+pn jf vh/rr 5lzh end. The scaffold is 18 m long. A 650-N box+rpf h /25hjel- vrz+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 ma; /p nl;p*xll wzx+h60sb+knhrk 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 0wzb ;spk;+ll +lnxn*ph6/xhthird 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 end.mw27 fr 1yuniform board of weight 100 N and length 8.0 m. The board is supported ymwn .e 1f7d2rat 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 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 1j*wgy-t hn*n mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, *hy-w*jtgn1nafter 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 7 eqsqd8gs8n9* +z 0mxi7x*h ggb8xupa wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0 m belowhuxb8gdp +qngsq*g7 i x7xz8*0e 98 sm 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-z; iv: q,nyni/0vmv d.joint pivot, how much force must the extensor muscle in the upper arm exert/iz ni,n:0qvmv ;y.dv 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 cz9ffqwn,5/dn enter of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle 5z 9d/nffw ,nqat 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 dvl*6(spzk40a umc)aqhd( v1biameter. The top is 4.5 m off center. How much farther can it lean dmvk4v) a h1sal(uz0( b*6 cpqbefore 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 compresseiep96wbmu985wdc j, ss a steel block by 0.0025 cm. How much force would be needed to compress the block by 0.0125 wsc9j w ub59ped m,8i6cm?

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 1t nhr lzbq p8n(4soj6w618ndyl)cs+ a 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 statioyj6 6f0jy yu;w ckq1:gn is 4.0 m long and 0.20 m in diameter. Young's modulus for y0j6y6kgw;:fq u1jyc 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 stretchesv:yi(uk g 66 s1mryf1s by 0.20% when a 6.28-N force is applied. What is the elastic modulus o6:6uf1v m(ssi gy 1kryf 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 suspeniq,,q ). eywav; *5cgvq2tuwy ded from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stw.;vqiy , t*gq)q cwa5e uv2y,retch? 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 per ea+-nz lxh.g igp8/( whib/i.son walking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure( bha-ig 8 hpn/+./iglzxw.ie 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 bi/o+jgs3n 5yarea 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 av zf tzc+4vyl+.ws 0 ska(3f8d 10.0-kg mass. What a8z fw(+dts0+vcs.f4vyz l3k is the stress in the wire? (The Young'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 2.0 mm i)b am4+i wb:hjn diameter supports a 10.0-kg mass. What is the elongation of the wire? b ia)wh4 j+:bm (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 of an al5pcg5guri 63oec03 fsuminum cube with sides of 30 cm. What is the resulting relative displr3cg 6p3 ouesi05f cg5acement? (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 pressure has increased by 14u penfxg.hxt+)ia.0, f(si p 00 atmospheres (t,ff4i+stxugh.ae (pn xi). p0o 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 compresu/ xj2 vthxnz 9-uk5;v;il7l+a c lmi5sive strength of steel is 9uu l5n xmvct;i-/7lakix +v52;lhz j$250 \times 10^6 \; N/m^2$. 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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