Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are neces6og6n x,p yig1sary 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 static equt8b/97fas:m p eqtio; ilibrium?

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 mvldna(;tk0t0g.wwq szz ,fh14,h/)b e y; vcthe book ise )z h/yv0vw tk;4fl;(nth csqg,, md. 0bz1wa

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 outert ituo-au,-;b space with a constant velocity of 9.8 m/s. What net i,ot-atb;-uu force 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 w (j(6eir4u33kmg zy uvith one foot on each of two bathroom scales. Which statev3y3(kue ( jm ug64izrment 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 massless se3 9i32 dswvn)gimi+x i.svmk0esaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the s sdiig. + m3 nvsi2xm)9iwk0v3eesaw?

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 b( veij0 )a2vlw:u(u(cc8 gs7hx zjz5in

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 tah bl34 z y-f8 d1mjsj12p*xxbxbletop 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.o7kwk2zcm (: ) hv/bwt One is stacked on the other, and the combination is to)zwvc t2k (/:hkmwb7hen 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 suppo/9 cdv3*o2qv/i6v; stoa acrvrted by three legs placed equal distances apart on the edge. What minimum ma *dv2;ct/r/iov9qa vs3 v6coass, placed in the middle 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 wir*g4ph-k ,n+vt m (nzu ab00rhces made of aluminum, brass, copper, and steel. Which wire t-mbznhr(0 0ka, 4pu vg+n*hcwill 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 minimoud udvou. 3nii,t2ez/v+() ium tension of 36 N. If the wire diameter were half as great, we would expect the tevv.u)i/zdn i,uooi(+3u2 dwire 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 poin z7(;l /27)ina auffk/ wfyrws)n.ee3lu 2rzqted arch ;rwr(y zqi/nzus2 e7/wu2a3) .fknf7eal) flis

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 fulcn +t3y yxg 9agu)gg8c5 b(kharcx)3cx3p+-lp rum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weightk ucg9 nygtg3ax )x xr 8lb+c-+(3cpg5a3py h) 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. Txp8yx- 05zqb7x a9nf jhe distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be x5 y 8x 7z9af-0pjnxqblifted, 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 bop-j+key qwb5hjq58 fd+ op-2ry has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot poi e5+bjqo fj5p q2-+dyp-khw8r nt 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 9;sv0*n aa7uj.ys+ otlw)drp t0*gxs center. Child A has mass 60 kg and sits 2.0. lg0 jx y*sutsndaoar0p+ws;7)9*v t 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 weighing 500 N and 350 N, eu1.l5gzwmp5ek0db 6respectively. If the support is at the center of the board and the 500-N child is 1.5 m from the center, what is the position of thede6zlubg0 15mkp5 w. e 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 7 p n 80bk woi:qfl o)7pmmsua651y(npat the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is th)y(7mpoppqa8nnu7w6l:im o0 s fkb 51e 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 sudbj1wv j//as2pported by two ropes at the ends. If a 400-sa2jj db/vw 1/N person sits at 2.0 m from the left end of the 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 tnsgag5 t (a5 5)ivrws6 -:mhvheld up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m ft sivwhnrm5 g vt-s a56)(5:garom 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 eachu 73e eerr, sq+4r/tad end. The scaffold is 18 m long. A 650t4 er u7aeqe+ dr,3sr/-N box 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 soid :1py+npl e; 5hlc,j*yz0u 2*uucmark and has masc125;ucoi *s hn0 lpyl,upjy+u :*dezses 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 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 uncpqey221 2 zloiform 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 left end, how far from the right end i2cl12e q2pyo zs 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 bnnr kle i:3hxt;) rh(*33z nwhetween them. Each scale is observed to read 2.00 kg. A person now lies on the plan3irlnh;h t )kx(ne3*zrhw n: 3k, 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 co qu cgn)s 90k.0xr3 c3rw2cxxmnnected 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 horizontal. Assuming the wire has negligible mass, what is the tension in th xqc20. )csmnr3rc9 w0x3 xukge 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 /+pzd ed8 s8brCG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 bszpe 8 +dd8/rkg 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 outgrittmb 1 j,-42xof(her wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and posf1t-4rt(mix bhg2jo , itioned 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 Px xmsfr2s 9x97ns(ha 5p:di -kisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther cx kpss(x 7i9s- : 95fmd2hanrxan 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 0.002im7s.ot2nz ;s 5 cm. How much force would be needed to compress thn z;s2oit7sm. e 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 dzxncp 5w3+ o(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 inno* 2uu8q )iuj diameter. Young's 8nu)*q 2iuo ujmodulus 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 strexa gtr r)i1k*:is-b u2vssn) ul+1ub(tches by 0.20% when a 6.28-N force is applied. What is 2*n-iusbs1tur)kx :biar1v)s +g lu ( the 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 a steel wire of diameter 1.0 mm agl dsex(yc*)3l1 u;g rnd length 11.2 m. How much will the wire stretch? The Young's modulus for steel is d lu x)gl13e (s;c*rgy$20 \times 10^{10} \; N/m^2$.

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 supporr w tc. 1g hoovbjg5t:lc1fy(8zy/:.v ts all his weight on the two crutch tips, each of which is circular with a diywc 1 :fyb..1 :/( lhgtvozo rt8jcgv5ameter 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 3lf nl/kcx-r ob12qv 5 a7(rji7ahm. jan 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 ldr4q+jig +gjkxb7 ;*yength and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in th;gr g 4ibdqy7j+kjx+*e 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 in diameter loa.bn22ku ;b supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminuabn l.2u; bo2km 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 ame6u;(j2 uzaxluminum cube with sides of 30 cm. What is the resulting relative displacement? (mazj ;ex6(2 uuThe 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 b oh2x +uke0d2uy 100 atmospheres (tohxd+ 2 ukuo0e2 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 compressive stren/m nov k-9q6p4ewi6 wfgth of steel is 9fke6 wmiv nq/w4 6o-p$250 \times 10^6 \; N/m^2$. 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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