Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equild fn4g:(u 8c p;a6rwmlibrium?

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 7d83l i/ 1t *ge,uxk /)wnjgmqpkhm5os)th z (necessary 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 the;b iolomioa-9 ky 2sm9n2a;i3eq7x, e book i3qi yb9 2oiae ;km2- ilonxs9a7m,eo;s

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/ssui y8).;qnxk) 3 4og)aavoh -cmbs with a constant velocity of 9.8 m/s. What net force acts on it?yk3b. u-om;hgis )8qs4 xovc na)/a)s

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 aus z6ka3-iy a2p 2it)3z c2bfwith one foot on each of two bathroom scales. Which statement is definitela-6bc kaz2su22 z3)pfi t3 ayiy 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 bala0 ly56;yf5v6fosym spf o6z4onced on a massless seesaw. If they both move forward so that they are one-half their orig s5vopf;6o ym460fsfyz6ly 5oinal 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 end is.n9 a*hqctq: c 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 taxr-2:s1 fdhlqm+5 d ef o8kic)bletop 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;q (r)0)- m)wq zotu1diivrup cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out over the edge of a table. What is the maximum distance t-i pm 0zu votwqr)d(q;1u)ri)hat 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 pla xhp6. dh;hc+ t9qm 01fkzjtj0ced equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the 9djkmjh0h xqz6cph ft.+t 0;1table'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 steel5tkl.d1 g lgz ,hjvhxg*k1 (,x. Which wire will stretch the least?vh.,g*,1j(x ghllztk 5kd 1x g

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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 wh1c- tvfj i243nepw3subjected to minimum tension of 36 N. If the wire diameter were j1pf4wt h23vi w3n -echalf as great, we would 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 of a po)g bu6qurh6cv1 5l) izelb,w1inted arch is l) 6 vuec,qg1u6l5b1 riwhb)z

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 k4j(ave6uoyt r*)l14* n q tmuto be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum w k)uuvaoey46ltr *n( 41mjq*t eight 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. oe+ s-iv4h) vxThe distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N vehix+so4 )-vrock 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 massless seesaw. The boy has a mt5f ,m1s w2h:2qnfkiq ass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivotwfi1hm,q:s 2t5q 2fkn 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 unifors ay,fw 0q7k1dm seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B h,1 y7df qwks0aas 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 Ni4bb05p ac:7iowh 4dd and 350 N, respectively. If the support is at the center of the board and the 500-Nib5hip4w 07a :dbc4o d 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 sue 1upfh7:(+0x xsi hbn 7mlh1cpported by two ropes at the ends. If a 400-N person sits at 21:m1su0 ( p+hei7lx fhch7nbx.0 m 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 supported byed54(x8fvr z5djv+y o two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the byxjv(fz5+ dr dvo584e eam, 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.mywwps eu1 2a rxv is/*:t*7k* The scaffold is 12 m long. A 300-N box sits 4.0 m fromt*m:7a1*kis/y e2ux p* w wrsv 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 each end. The scaffold is 18 m1w. eg+ud1 kyky 11aqw kf1nh+ long. A 650-N box sitsky1q+we1 dk.f+ a gn1h 11wuky
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 at2j qkppz xz dk)a0tra)13+;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 third mass of 0.30 kg be hung to keep the stickk 1t)dz 0)p+tj zrapk3qx;2aa 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 unifos o4y t/yc5,97v 5ps djduncw*rm 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 rigdjs p v4ytyd,*9s5u/ ccn7wo5ht 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 bk)s .rdm. 91cmlblm*qy 2.00 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*d.1 mskl. q9mmb)lc r, 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 con1am:u95egtajqkn(+p nected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing( +akjgtpea m59:uqn1 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 m.rh klgntf9d0(:ghl +ass of 2.8 kg and its CG is 12 cm from the elbow-joindhl0+9n:glr(tg khf .t pivot, how 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 2.0 zepqq+6in9z*:la l5m0 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sid 5z ai:znel9+qm*l6pqeways 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 Py7m/qkf +alpc5 p( c)oisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean beforepamkf/o)p 5y (ql+c c7 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 force woc.7 l qykpl:qr; qez75uld be needed to compress the block by.e lqq: ry7pc7q z;5lk 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 crossfi04gldl k246h a az3+qzn5 gc-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 / b8t ssnrx7;q jpxp/-station is 4.0 m long and 0.20 m in diameter. Young's modulus for st7j/b8psxs r-xp ;qn /teel 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 m s.t3/awm d,fsq.ylu .m stretches by 0.20% when a 6.28-N force is applied. W3su.ty sl.fmd/a. q,what is 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 diametes ola 0 p:r:m 78zczll9b4x8jir 1.0 mm and length 11.2 m. How much will the wire strar78sc0lxbop mzl 8:9z 4:jiletch? 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 crutches supports all his weightnod3a8 gi i-3mur3hv0 on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What presmugnv3i330 h8iord a -sure 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 anfjo- ,;yess 2k 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 length an5hk7 kb +2)e+r6va b6*0vfhhfrv ywgpd 2.0 mm in diameter supports a 10.0-kg mass. What is the streffg6krr25hey*++bah7pkvhv 0b vw6) ss 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 in diameter supports a 10.0 (rerr-vrp on) d0mh65-kg mass. What is the elongation of the wire? (The Young's modulus for an aluminumdhomen5r(r0) rvp -6r 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 ta( :zh6wz + rpat4og*zo one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear moduwgp6+azh :4 rto(azz *lus 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 i wjl ) c uf7zcslv+6t6jt(+(ywn the sea the pressure has increased by 100 atmospheresftwvc l6)+j(sjy7+c (wz lt 6u (to 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. .5w6m/c3 qe(ne .gl cbm ji v7ozal08xThe compressive strength of steel is 0z5bq l/.evne xiwo8 ( c.ca3mgm7j6l$250 \times 10^6 \; N/m^2$. 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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