Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotatiozjk74i 0bh1 donal 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 for staticg)q, 5kuh(/)no8ctm s y zd2r4 -iuqrv 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 /(2 a9pocdon/1czuf bhe net force on the book cdpu9c2ofn(b/az1 o /is

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 of vl 7ssk4 c o1r)yk*-kq9.8 m/s. What net force ak-cv *syoks7q1r)4k lcts 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 twoiljss2k1j oc -a6 s,n6 bathroom scales. Which statement is definits 2 -6ilknj a1ss,6jocely 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 ma9bi);w )s nr*uiss* ilssless seesaw. If they both move forward so that they arews is;*) bri)nl 9u*si 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 ecvzqc q.4(k g/nd 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 tabletop ic37ok)i+qqp+cdr m.ks 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 cm x 6.0 cm. sn;u/;dxih: 0dyfm/v One is stacked on the other, and the combination is then placed so that they project out ovnmv d;xyu 0h; fi/d/s:er 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 legs placed equa; vzm7mzz 61d ofs 8v(r9prc9hl distances apart on the edge. What minimum mass, placed in the middle v 9dm6 ; z19rpcvf(zrhzs78 ombetween 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 identicas1*+ riaysh5 rlu787 aex5u)q4anqx adm /m-dl wires made of aluminum, brass, copper, and steel. Which wire will -y5m lx4q mxdq5a* iuarn1+dsrs8he7) /7au astretch 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 fou+( qhinic 9)+g,jahm:nt nn: gnd to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire j: m n9inth +h qni+g:,n)(cagto 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 pointey+w vm*zgba :,d arch isb *ygm w,:+avz

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 distance6 +/ glzh7fdbi from the fulcrum to the weight to be lifted is 1.0 m. If a worker pu7+6hbzgl i/fd shes 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 be lif 0wu+i zhyd d*zsn1-d0ted is 1.0 m. If a 3000 N rock is to be lifted+zdhsnd yz-1uwi 0* 0d, 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 are2,y d b-f.ev8xyluoap6m,f:i balanced on a massless 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 point on one side of the seesaw, whe2dfa.6u:8oby y fl ,mpe,v- xire 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 whicrsn8,,i u0k xs v/s1nqh pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B ha/q0 nr, n sikusxv,s81s 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 weighin+q x5v z,22*.hql a pzxvqc)ltg 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N child is 1.5 m from the center, what i a z+)z.tvlx2qx*,vq52 qhpl cs 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 rope9dnb:bp+ ;a. q(x6l phi n(,t-hv mvcus at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension px +v -bv6,l(ndhua.;i9 (cnq htb:pmin 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 l2s50 9kw bvuxthe ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in the right ropek v xlw9us520b?

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 r 9fku54009(p8 m jv)hn;npvmwbqnvm by a wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the lefnvq8990mppfmuv( wn;k5hm) 4 0jnrvb t 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 n lzb l5utvvt;j4,g h.l;1h-ais 18 m long. A;;5.vvthjl- , t1un4za b hlgl 650-N box 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 edge at the 50-cm mark az q bq9o xkd*v1l7;sv i8rf(h6nd has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, resvk hodiq; 1xrq(7vzb8*6f9s lpectively. 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 u t e8-w1uysdvo0 iz89eo --ggqniform 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 ri9oyeoqd-01ggsu- -t w i88 vzeght 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, an1mrjw7o i hrtx ;a:-4zd a plank of mass 4.00 kg is placed between them. Each scale is oj xmrz7r;i:-1 h4wtaobserved 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 connected by a wire. A bird op67 27tt;bclqt v l/2rrgxlt 2f mass 0.50 kg lands on the wire midway between ther; t/6btqc77l t22lgr v lxp2t 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 an fk-o.(*oe niud its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert o-. of(*euoinkn 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 u+:kvu -7w/wik xrqp-5ao 3ljof gravity is equidistant from the sides, and positiopua-k/ 7wr5vjowqk-ilx+u: 3 ned 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 6lufzu: c8h(t tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lh:ft6lu8uc (zean 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 0.0025 cm. How much fo(1nrre. gi 3qkrce would be needed to compress the block by 0.0125 cmq rge .r(nk1i3?

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 y cm.j9ibc0yj2q0 t7i 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 service stationv ssk; ;f 1hocut:7hk v8z:2 btcx4z9s is 4.0 m long and 0.20 m in diameter. Young2ttso4bf;vh 87: k1ksux ; vz:s 9zhcc'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 t++v /f8njjavupb:,e-N force is applied. What is the elastic modfbta,vn8/ je+ +p:vujulus 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 1.0n6p(:i sn0b mzg40qxd mm and length 11.2 m. How much will the wire stretch? The Young's6pn0ziq 4bdn0g (mx 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 crut )-pslai )u9ypz7 x+bdches supports all his weight on the two crutch tipb 9up + yi)zl-)x7apsds, each of which is circular with a diameter of 4.0 cm. 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 are*.fgihs xet5) a 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.cv- j9hxgv(ss:pb1t h0y:p. k0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? ( v1hyjh .:kt0vp :spx(bscg-9The 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 s 988+g: .ip,pbrrkzxa ukgbblc 5v:cz0m *pq; upports a 10.0-kg mass. What is the elongation of the wire? (pgcbmakzk:. lcx0b8*gp+ qb 8;z9rp vu:5, riThe 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 rqf5vb;a9lv. one face of an aluminum cube with sides of 30 cm. What is the resulting relative disp.9lf vbaq v;5rlacement? (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 1k / tvrfw4hec0zk*k-fjzey 797tz) t)4jr *kb030 m in the sea the pressure has increased by 100 atmospheres (to ab4b))rz*7k /74vk -z tk ewtfhkcr 9tefj0y j*zout $10^7 \; N/m^2$). 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. Thebk0opcr (9 zahml3:b- compressive strength of steel ishpm-oak(r0c:b 39 zl b $250 \times 10^6 \; N/m^2$. 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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