Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are ne:;cadr-l7 oe0gux4dh sfy ;s- cessary 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 nec- -y9d)ujwbvhessary 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 t lgfhjjo4k9(5he net force on the book i fjj gk(4o9l5hs

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 sphx.4a* ;9tp8tcrvd*mdr i487 b f ofelace with a constant velocity of 9.8 m/s. What net fe47lrth8m8cd. pt f9a4bo vx **i ;rdforce 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 bathroo(s/5yoj i6 5kznrxfjh (c:w 5tm scales. Which statement is definitelkojxh/c(56nrs :ji w f 5t(z5yy 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 masslessr1 o vmqjl9)lfvy oao5 -34w7z seesaw. If they both move forvlrzwaly-59ovm3o7q) jf41 o ward so that they are 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 sma.*oief4k0cw 2cbfx(: 9uuao.sf r) jq ro4 h8jll 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 horiz; dpo4ttq /b 9z1a9ec+h (kjjoontal tabletop 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 ci r:81tc +ws4a t9kjddimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and thekdw+ trj ci:8 4atc19s 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 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 supev 8sew-9 uoppkp* 2dn7ai(+axv.xw 6ported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle betwexu -ae *aw.pk2v9io+d p8w(7e6 vxp nsen 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 wires made of aluminum, brass, coppe4lw1sn07cdde:+v+nwe ei vk um,j:w 2r, and steel. Which wire will stretchv0, jw4de7:mu i+1 c v+ :edwelnswn2k 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 whvly0 eyfi44 +jiwnb9 2h -p92elbcco(en subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect y2pye2v 0 ljn+ce9(oicwib -b49flh4 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 pointed) qh/f a2.jo7,mcsggo arch /soqgoa7 hmj f,) c2g.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 ful/kkrwye+wyv,bg 9noro1.s,d7 o 2)n hcrum to the weight to be lifted is r 9 kw+,ynws o1n,hbo.r)2vydgo/7ke 1.0 m. If a worker pushes on the 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 weight to bazj :dm :,qx:i5 2jthke lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on thexq j:diz j5hmta2 ,k:: 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 masslessn ,py4ma.7r-,jmzq,gj kc,a n 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 pivot poinm-nq.czmjj 7ng pay,,r4 ,a,kt 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 71 dq+s zgfb:r 6cpkp0y-bk 3bof a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m f6pb1+by3kc qz gk -pb0:dfs 7rrom 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 +)k.*d-usw-bhcp mgm supports two children weighing 500 N and 350 N, res+sg. *mhbm--duwck) ppectively. 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 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 by298w c3 tm.gne+kaqaw two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what a2eck.w w+ 9mn8 q3atgis 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 ropes at the ekcu6 pyt9 a)m/y)h 50jfs*za6 hi5yb rnds. If a 400-N person sits at 2.0 m from thfc u )hki6zjyar*m 5tyyps)b5 0/6ha9e 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 held up by a wire at each end9/ tjry8qk5ik v5 bo5pj 2t8px. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. W 5xijko25bq85vk jt/ty 9ppr8 hat 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 each end.r8vj7h,jcs+ ys2 zdz0 The scaffold is 18 m long. A 650-N box s h2yr zjj c8d,7svs0+zits
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 7e vw/jm+*/ylj t1npmo,m1zz edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectively. Where m om 1yvjtejz*z+l7/n/pm,w 1(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 uniform board of weight 100 Nk 0s z1 2iw47bcfs*ogq and length 8.0 m. The board is supported at each end.4os qizf1sb *g7k0c2w 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,/ 2bzhdt2lmn ; 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 n/ t;m l2b2dzhplank, 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 connected by a wire. A bird of ( sqv w)v(z0qlmass 0.50 ((s)vq0zql vwkg 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 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 m(e7ol 0za2ead;d3 1/f t ,.drfut snicm from the elbow-joint pivot, how muc ;ddsaa27dr0e/3e( .lt1ff nzoi,muth force must the extensor 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 granqxk9qi8 ci9zw om4p()n 15vovity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle atk94nq o1m)8 qwoix5icvp(nz9 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 diameter. Tsbkalf)0c b xjebnx-8ri 401:iwf7* cc 0gbw4he top is 4.5 m off center.-xf jb :ik* s0cb0i0a4l 7xbcefb) gw1wn84cr 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 0.005 (ob adbuj-e u4z*fu325 cm. How much force would be needed to compress the block by 0.0125 cuf-d b4o(euab5zu3 j* m?

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-seccr k31ziu8 ;bstional 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 0.2q c*q 1j:8bdiw0 m in diameter. Young's modulus for steel is *jwqib8 1:dqc $20 \times 10^{10} \; N/m^2$. 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 6.2s blw 4 w+nvki)f1a1 -rjeph -hb924ww8-N force is applied. What is the elastic modh f-1v+)a2r p94n ej4bk- w1shwi blwwulus 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 1.0h6rc)05cdr3c x5esy 2upepp : mm and length 11.2 m. How much w65py5 hpc s03 cd2pcur:ex)reill the wire stretch? 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 person walking on cj-sc( 3c7f8cy0pb sfo7p)wrirutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on ( 78c 3fr0 sbjp) -cioyfp7swcthe 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 h54 -x2h 8ary urqtdm4f8eb,rarea 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 ge (;mg )iib2houwnfqu60 . 2adiameter supports a 10.0-kg mass. Whabfw6(e 2ihnqug .io02agu;) mt 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 an1e;qtxh ndgt49*swqs7w 9 v8cd 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for d9;qs n1xqe*8 ch t wv74twgs9an 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 wits r /h1i23a(asd l,asxh sides of 30 cm. What i h3 s1rlaxas ,2(dasi/s the resulting relative displacement? (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 increasea+ocott) 4n/k r/wa3 dd by 100 atmospheres (to abou)c totoad4r3 + /na/wkt $10^7 \; N/m^2$). 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 diamz uisdi1.q2g-iz; k 0 rr-x/aceter of 30 cm. The compressive strength of steel is 0zki 2r.q-csg;/i i-radxuz1 $250 \times 10^6 \; N/m^2$. 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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