Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equile xx5,9gkq.m7x y ophr:nd /j.ibrium?

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 equilibtl:7qh z s-iv0rium?

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 he rfvhb0ym9i8o1/ ( u:etx: ijypd past-n):9eld at rest above your head the net force on the book i dnte-y9fi(bvir/09 :j: a)xm sopu:e18typ hs

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 9 / 9pylqz,znjconstant velocity of 9.8 m/s. What net force acts on i zq99z, nlpy/jt?

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 batgswhh-db 8h,bfwe.hnk+) zf3 g9d;z, hroom scales. Which statemenz,ds;h-, dbhn f)g 8wf+hk wh3 b.9zget 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 mpgf+q+bzmualj 1*6w :assless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the6:quj p1+gfba*+w zm l 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 i7 (he6mv(ddzwrhf1 .l,kjri8 ts small 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 t 17h za*zz s;o6ak5xjiabletop 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 briyj i+kk7jy /0d lc;8f:wz nj4mcks, each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on thkm87wkjd y jin;yf/:z 4lj+c0e other, and the 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 support w j2hs/g+6uahed by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two sug6+swa2 hju/hpports 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 st,mep s 7fc4xp7qahp /4eel. Which wire will stretch the l4fx4pc,s 7ehppa /q7meast?

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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 N. If 2lurkc3yn :lpnw9r04c3 kzw-the wire diameter were half as great, we would expect the wire to break when subjected to 0czk2- p3u: lryk9r wnn4cl3w 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 att3j l+zk o*t:(ar m(px the base of a pointed arch imjt *:3at+(z(plxkr o s

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 distku70.c2yj lps ance from the fulcrum 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 weight that can be li72s0pk.juc l yfted?

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 h3eu np7o7 rmc,+iqo1 fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exertedo u,ip 3+ 1e7hqmr7onc 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 ofi1m2cg(razng 6 qm .c1/1jttn 75 kg and the girl's mass is 50 kg. I12 /zaqntcri 1g1( t.jmgmc 6nf the boy sits 2.0 m from the pivot 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 uniforrjosr 3 -c6s 4r/zxz(rm seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has ma/c z-xo z6rsr(jr3r 4sss 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 chilifj5c499pv54ew l howdren weighing 500 N and 350 N, respectively. If the support is at wf94ch 5wipl9jov 45ethe 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 wfj i9bfk a:wh:ndi 0q+7+k0j 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam,7khn 90+jd:q0kfa:jb + ifiww 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 support hf4q 6hwr,w3y6iolxb 42ks4med by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the righ6wlm4fh 2r6b i4hqo,w3 4xysk t 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 g 3j6-mcby.lo m long. A 300-N box sits 4.0 m from the left end. What is tm.6o- 3 lygjbche 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 m ljeio*;,q(smmk il)sk zv*3( yong. A 650-N box sit3smlzy)qj m*vkio i(*,; ske(s
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 ids7ytvc: o,ak -47 xlis supported by a knife 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 (at what mark) should a third mass of- cylx7oi4:a,ksvdt 7 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 N ankp vguwj9o6bn 0r49 5sd length 8.0 m. The board is supported at each end. If the support force at the right end is three times that g6pn5j09ku9bovws r4at 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 pv-83)dkv yb v px2cd;elank of mass 4.00 kg is placed between them. Eacx3y;)dd v82 cpvev k-bh 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 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 conn5p3lvk,a 3ke ;ss4.hs: 6 hwcbwp6r oqected 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 negligiblhbh 6,s:q;al s3wk 5 s3ke4.o cprv6wpe 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 CGe6k6 f1nxbnnm6; u7le 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 kg s l1efukn667 x;n6emb nhot 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 j9h84 bxvg wpdag6 5a:+ 2vcnse-0wsj center of gravity is equidistant from the sidej-hped+c 5vnw6 w s:a0a4gvbx8 gs9j2s, and positioned 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 Pisa is 55 m tall and about 7.0 m in diamet2kxafqh q2)0 ixd*; hwer. The top is 4.5 m off center. How much farther can it lean bq;a h0if dx)hw22kqx*efore 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 c5/glqv+q x2 axm. How much force would be needed to compress the block by 0.0125 cv2xx ga5+ qql/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-sectionalut,n:h c nh e3k(ms26gd izl/ma je-cm/7.mv9 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 lonf.jw(t11(wf7iz j 1-yjrn cafg and 0.20 m in diameter. Young's modulus for steel isar7ij1 (1t1yj-z jw w.ncf(ff $20 \times 10^{10} \; N/m^2$. 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 ss2qmai37l:ro 6l h+ gdtretches by 0.20% when a 6.28-N force is applied. What is the elastic modulsq+ lgrdm:6ol 7a2ih3 us 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 diamtc 7,)z0jo 3j9ycule b 4avob(eter 1.0 mm and length 11.2 m. How muc)eucaz3to,jlbb 9 oyj 70 4(vch will 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 cru *9yxad) 3yta.:c mmqrtches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm* qada:.cy )r m39xtym. 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 an area of 77ep ;px vr95 pkoyt3w$1.250 \; m^{2}$. 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 ofo 3a9sb4gw0a 0b3xu mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulu 0 ba0fu34aobgs3wx o9s 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 n:9 ;n4ljr /doydgkg8supports a 10.0-kg mass. Wh8y94o:g knj;rngdd/ lat is the elongation of the wire? (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 Nf49 j gc f)pdlr-n6x;w is applied to one face of an aluminum cube with sides of 30 cm. What is thc;j pg4f d6 x9lnw-rf)e 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 ths kvj 5d(4totm,6nr w.e sea the pressure has increased by 100 atmospheres (to ak.r5wt v ,4jdnot (ms6bout $10^7 \; N/m^2$). 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 strength of ste .0ajcgd6 nx/s:tm. ihel is /6g.nxtsmj:h d ic a0.$250 \times 10^6 \; N/m^2$. 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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