Physics Unit9: Static Equilibrium, Elasticity and Fracture - 无忧得胜-网上国际课程 (5edu.win)

1#

What condition or conditions are necessary for rotational equil)4w:z up/j x,xtmb7tx 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 for8k7muywbpfu8.- ,w (em0ii hd 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 ab -kfw7)jjipm /ove your head the net force on the book isk)f/jp7-iwmj

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 constant velocity ofb eegwag9mui2) bo,,tw,o3t+h4p6fe 9.8 m/s. What net forcepgw)9 ,eoawmbb+6e h,i4t u og3,f2te 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 bathroov9il 7.aeznk 1m scales. Which sti1 a97k l.zenvatement 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 seesaw. If they boti.gu zn w nsjbxem5m(;70 ur;,h move forward so that they are one-half their original distance fro,jw;7u5n;eg z s bm.xmr(iun 0m 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 pt ,2nu:7uojy 9j ih 74qep0: icqt2lgin

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 horizontafy64wals:gp y* o+g4al 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 dimensions 20.0 cm bb7gw6i 81 fgtx 10.0 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 tfbg btg687w1iable. 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 sul7j /o,1b,ylq70w tzkaez *f ipported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's ekj*fy e, l 7wqoz,ia0 tb1l/z7dge, 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 iden7uib g:hum*4-qoks; d tical wires made of aluminum, brass, copper, and steel. Which wiumhukig- q 4s7o b*:;dre will 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 *lq.r6lvd1 bfwhen subjected to minimum tension of 36 N. If the wire diamel*1qbvd6fr l.ter were half 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 c*nlmvq40d3p inted arch v4cq* dp3l nm0is

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 gph*giwb1 5 qc1w9dj/ to be lifted is 1.0 m. If a worker pushes on the opposite end with c d9/ gpbw1q*hiwg 5j1400 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 78jkh)o3 xxdf weight to be lifted is 1.0 m. If a 3000 N rock is to be h)x xodj8 fk73lifted, 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 mass70r1td:es nmiless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 e0i rnstd :1m7m 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 uniform seesaw which pe/ 0h.t3xra kgivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How0gre3t. / xhak 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 w/ ob opop6)t;9uys9.aa-csp10 z 3iwq2p twpyeighing 500 N and 350 N, respectively. If the support is at the center of ty9 qo.i 1za2psw pwop3- p9 to;abt06y/p)scu he 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 by two ropes at the end v1 xa ki-+cgxkh+87gfs. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tenaxx+g v1 8f7+hi-ckk gsion 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 tyt6eovz/ ,szw* r 51kfhe ends. If a 400-N person sits at 2.0 m from the left ez/, k6eovwy* r1fz s5tnd 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 wd7gymj:w5 mv,8 w gou/l43xnis held up by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in eachl458dxg 3: wg /m, uovwmj7wyn 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 s9jc1 djde :tr(caffold is 18 m long. A 650-N box si9jcted (d :1rjts
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 stic8kej:g:yb s9 s6p oxs/k is 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 marxs/8s jsegy o6bp:9 k:ks, 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 board of weight 10w8cf4ipj: jt h:i4rb i4 l(v6j0 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, hobcjv ti f6prlw j:4 ii8h(4:4jw 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 plank of mass 4.00 kg is placczy 8w*u0iw+r ed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after why8ur0iwz*cw + ich 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 con4lspuq.iz;yuv5* wy8*n bt)x,u9 jdynected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2. lyb;vdyu,uxsy 5 qip*.)4w8z *jtn9u0 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 aogsv69fk9zw * duba-9 rm has a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pobv*s- ag9k6d9z w 9ufivot, 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 ba h kqtnp3(s .t):s*txgx)bnd7 uaa:b0se width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the mat3t0bs:d ps )(a.tkg:7x x uq*bnan)hximum 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 aboutg 7digd xjz9o )9ef +a;l6zj3uir1bk: 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it f :iu +g d z17)3rj9o;ikj6bzladgex9becomes 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 76. co koy ygrk(u(ccuud4(5k a steel block by 0.0025 cm. How much force would be needed to compress the blockk(d54. g(o 6o( ycuur ck7yukc 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 an,cl*tdy ufa;-c1*xl h d has a cross-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 snfgb+w)ztl 78 ervice station is 4.0 m long and 0.20 m in diameter. Ynfl z+7)g8 bwtoung's modulus 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 stretches by 0.20% when a 6.28-N forcef+ei5 -p q x(tj6tvpjd 1dx0-w is applied. What is thetpfd xxd(ej+-qw -v6 jt1ip05 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 wir7eqt8o(j/axu e of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? 87o/(aux qjet 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 weight/rt-gilwqmwbk(:1m9 (ul 3gq on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerqk/9lw1(q- b igtlmuw:g r( 3mted 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 are)ebm ;li b4 s(,sxr 3s7ci tyotl2b))ra 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.ail k ux) *j afpfhr35+a c1en;)hxal0 u01c*f0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus fonp)hfhxuxaiu ace + fka1lj; rc 3 f0)l0a*5*1r 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)4x(m*l4 gj;hwhcl ta m in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (tawlcx l44 g*h hm;j()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 N is applied to one face of an aluminum cube wif.1wqesg;bu1+00vdxy(n yt qth sides of 30 cm. evtqy( u1xy.s +w0bn 0gqf1;dWhat is 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 p;ucg++23/c c cdd cgk-yi,cto 4) pqykressure has increased by 100 atmospheres (tcd-4 py+ tccc +oq/uky, i;c2)cdg 3gko 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 30v k)hqmqidj9u2q5(6wlk0 sk/ cm. The compressive strength of steel is kuq kdv50/6m qks2l i9jqh( )w$250 \times 10^6 \; N/m^2$. 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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