Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessargp0gkv; ycqo)pzk, q/6r*m-py 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 ;.wj- wwo+.rccbdfz/4a(3 cbto xi0 qfor 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 ho/mvzasxg559ws ft 3xv+;f+ew8pd*v lsx.2 leld at rest above your head the net force on the book is;xs5tw9.so *x+5d/pfl e lzsv fv238wvxmga+

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 consta ydy. 2ckz2 8blqe,v1utd:vj5 f1x *oont velocity of 9.8 m/s. What net forc*2eqy1jzbu. 8v 5od2,y fx1c:votld ke 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 m-x ibexrs biz(3 f2a8f..wy.each of two bathroom scales. Which st3f sw- r...afi(bx8mbyxz2 ieatement 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 balanced05; ac ;ii 7gm5.rstzp.hhfj t *q6nzx on a massless seesaw. If they both move fora hqz;p6iz j t57r0gxi*5hmf;ctn. s.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 small rz 8ww+;/kuvbjn d s8: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 afuv4)h (jbqki0*0 n zhorizontal 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, ea f-yny0t5jjsw5 i(ui9ch of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combination is then pliiws9-jyf5nty(j 5 0u aced 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 lel7 ih/*iy:hob gs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the talb i:/*7yhoh ible'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, k 39h0ygoa5 )mrvh 9vrg;aq -qcopper, and steel. Which wire will stm gg93oq r 5rvyh;0a-)kq9ahvretch 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 szxb:xf y:ui/5 ubjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimf :5iu yzx/:xbum 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 w -hv8h-ty oit-mer2bl j/*8ythe buttressing force at the base of a pointed arch i-/hj8oh28ty-- rtbi l*ew yvms

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 weighvvh yzuu -/g+*r-6nqxt to be lifted is 1.0 m. If a worker pushes on the opposite en6h-vzy g/q+ru-*vux n d 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 be (gi)m2k2 xere.e i mo-lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be eoe-(kx2m iee r im.g)2xerted 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 boy has a mass o:3( xwohefvt:0 aoby0 f 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point onhfytb3a: e xo:owv(00 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 enddy.:vsep d1qtr2i3 hv.8mh :z0* k qrss of a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from th hreryqhidv2dptz mv::q..0 38s*k 1s e 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 c)xchu-p :d y ,xuu3hvfw 7ubi0jq4h1*hildren weighing 500 N and 350 N, respectively. If the support is at h3 wu uu1fiu vb,4:c*hhxp) xqd07y-jthe 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 e16mvaufy2 2198m bf 2uipwf usupported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of thw bff2yui8m16 9pauv m2 1u2fee 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 supported by two ropes gsuj) awp ,6zp762fcj at the ends. If a 400-N person sits at 2.0 m from the l 6zgausj7)j2f,c 6ppw eft 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 end. The scaffold is 12 m lz5f0 zkd p h/xv.,k)fkb.hq;mong. A 300-N box sit/)zd mqzk,p kf.v.f0;kb5 hh xs 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 wires i ,gzxxo x2i /sy/a,mix.6o0 at each end. The scaffold is 18 m long. A 650-N box ,z. o/y 0g,2asx/ xxiixmiso6 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:l. snt jf4iw;j)qf bkhq9(.c edge at the 50-cm mark and has masses of 0fn:)f s(9w ibtjcj;l4k. .qhq.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 uniform h32ze cyvap(:hrp;)eng. o (a board of weight 100 N and length 8.0 m. The board is supported at each end.pe.e cg3o n2zy; v(:ah(apr)h 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 -vh q2hwr7wpy4 u 1cp b:q6ny9plank 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 right scale reads 30.0 kg and the left scale reads 50.0 kg. How far from the right scale is the per h-:hp1u bp647nr 9qqw2ycyw vson'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 7r)hurob 4b00*ri eqrm and connected 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.hr r*orri0)4 07ubqeb 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-i/vl*r73 txyk joint pivot, hoxy* vr7ilk3 t/w much 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 b5u zqc nefr2l7zr;fz*7:g 8 iof gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which ic7g2frf 7bz*zr8;nqzule:i5t 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 l f8xtza7mz 725.dsb:rid-aj ,e5mcr6 8j fjyabout 7.0 m in diameter. The top is 4.5 m off center. How much farther can it azsibz tmje2f 58c,r.yjd8x-r 76jdl57 m fa: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 ;p,(gsq :rdbby6 gft*by 0.0025 cm. How much force would be needed to compress the block by 0.0qbg;g *bpyr,s6(d t f:125 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 ih6bm c9t5w gsxh2 ;*ise3ka( 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 yfsf3e c+xbg* 1jqq o2ncp0plr.5 8y) is 4.0 m long and 0.20 m in diameter. Young's modululnj8 p0qqb. 3cp5cs1 +yfe rfoyg)x2*s 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. +nsoc:1iq7 hi20 mm stretches by 0.20% when a 6.28-N force is applied. What is the elasticsi+q hio: cn71 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 and lengt- zmf gxw01s-sh 11.2 m. How much will the wire stretch? Th sxws-1m0zg-fe 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 b8eb6 -o5vf ucwalking 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 is exerted on the flooruo be6vcf8b -5?

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 arep , ;qbnf)eoiue..6 nba 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 (v0dhg v 2p cbkt*f,j9diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminkvd c t2*jvf 9h(,gpb0um 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 supports a 10.0-kg mass0)r c. ck 7.xvoiix,fr. What is the elongation of the wire? (The Young's modulus for an alum). ci.v x, rkco7irxf0inum 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 with cx(u v83 ts;ubsides of 30 cm. What is the resulting relative displacement? (Txtcs83ub v;u(he 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 pressurek+c3j9k8dxwfl3gu j*f 0p z l6 has increased by 100 atmospheres (to abo f*+jl6fj z lu3kgxkdp8w930cut $10^7 \; N/m^2$). 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. qkfsbrn)6u c+1 .vb/1rpa/qe-i - rdn The compressive strength of steel is qf/ ek-+ b-n1buri.v) 6c r1sarpqn/ d$250 \times 10^6 \; N/m^2$. 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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