Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necok.wt2.v-uvk essary 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 for staticd ig-rt * lj416fqu:eb 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 n lvm6:v . so(c1hk0rai 2om6qoet force on the book cvshi66kmm o al.2ov 0 o:(1rqis

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 -w6vck;fu i.2(chd3 hrgq / veouter space with a constant velocity of 9.8 m/s. What net force acts 26c3h(;k wfiguh.vqv d/ -rce 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 ,j- ism 7vw4t.rvtj p)stands with one foot on each of two bathroom scales. Which statement is demv4r jspw )7, itv-.tjfinitely 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 oncb47 +k mi(uln a massless seesaw. If they both move forward so that they are one-half their original distance from the pivotucli(mn b7+k4 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 smyrsw8r 15r,in nt)dr f5ml hram.g0*(all 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 tableto e -w+l6caz(4zcx loqm4; x-kop 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 10.0ku14 wu0er3 as cm x 6.0 cm. One is stacked on the other, and the combination is then placed so that they project out over the edgsuk ew043 ar1ue 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 equal 7jsfe 1srny,.6 g (oqxkd7mts)sxa (;distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause the table to overturx,go6m js n1 e7yd)(.x(aks s 7qrs;ftn?

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 st4w4m nye85vv0 k .xrkzeel. Which wire will strezk 5wn r44xvvkye .8m0tch 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 subjected to san; yugrh*27,1w h*nv6jwwdminimum tension of 36 N. If the wire diameter we; gvwwdn1njhy2*r6 w 7 uh,a*sre 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 po3yk ydsx85/.gnme az 7inted arch .5gda8ky3sx/my z7 en is

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 to be liftey:qg //d o,ucjq yvn(b4v2ygwrk4+ /cd is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be li+j cguwd y,/:/qg2 q(ov /bvn4ycyk4 rfted?

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 n0/7yazgmtna 2 ;6/z: dpqixjweight to be lifted is 1;maiq t y0j:/pzd26na/ gz7 xn.0 m. If a 3000 N rock 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 seesawqluk6rljfev/9e1 ycb.)7a ( w. 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 sidbkyr l 9 /l vw6ae7fucq)j.(e1e 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 unifot+r0t, a3dpdy rm seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass 40 kg. How far from the center must child ,t+dayr t03pdB 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 N and t550ok/ r6:nvy eiy us350 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 is the po y65 5s0oevt/in y:urksition 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 100ddbjk/y/0:,(zpl ic4wd wdf) 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,(c4 k),d /yi dwdd0z p/bjwl:f 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 at hqiy52z4+ f3q: mghfk the ends. If a 400-N person sits at 2.0 m from the lefm3 fi:+qh2hfykqg54 zt 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 i6zczl;i jbjwz* l:5 7ljsnb:+s 12 m long. A 300-N box sits 4.0 m from the left end. What is the ten6bsjiznlj5bzj;l+z7* : w :clsion 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 upcga o1iu8* uio.;sjvh*uwl5d2 op 4+w by a wire at each end. The scaffold is 18 m long. A 650-N box sitsu c ws;u*uph 4o*o.j5i+lvd2w1i ag o8
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-cm4 a5x us6gl(k/6 wzq4,h haqof 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 wkx zul6ah/4hg,5 (o4 qaq6sfthird 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 100 N and leng vxb. .a1uwu.y ;t2hieth 8.0 m. The board is supported at each end. If the uwvx;y1tui e .hb.2.a 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,f: yy)xt*w4v0nydzcjnyky 6g 2 36e 0q 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, after which the right scale reads 30.0 kg and the left scale reads 50.0 kg.6n:y yy6t jyn)yegcx z0 dk30*f4qw2v 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 ;,ohvb:- t abjty6rw8wire. A bird of mass 0.50 kg lands on the wi:y,hr6 aj- tw bb;ot8vre midway between the 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 and its CG is 12 cm from the elbow- y-z z9kczqxlx34db)i13y6 o4aib -krjoint pivot, how much force must the extensor muscle in the upper arm exert on the lod6i krc4y x bxa-b-1zzlz3)i9q4 o3kywer 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 o (razsxxtacw 4m04+cnw3 )2 awmz y)di3;0wqwidth of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sidewa ayrnmws;c+a 4 d)zot33m(i0w xx )2 zwcqaw40ys 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 Pl hjd,3e , y subixhec,eq1v6(hg0 5s;isa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farth6blje3hviuey,(;hed1, x h0s c5sqg,er can it 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 byc*75p p. gnwpb 0.0025 cm. How much force would be needed to compress the blob7 ppncp5*wg .ck 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 and has 4wl*91lu zhxxa 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 station is 4.0 m long and 0.20 m in e.;e/-2 ubzt y4rqr1 zmkx6trdiameter. Young's modulus for steel is/bezq-rtxty 6.ue1 k2r z4;mr $20 \times 10^{10} \; N/m^2$. 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:ngqq)k k/ q)f2tiyn 1iwg;l/% when a 6.28-N force is applied. What is th;/lqq2n /ii))t1n kfgw gk:qye 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 diameter 1.0 mm and length+srorfuiu z4 6 5bfbr752kvo, 11.2 m. How much will the wire stretch r5rzbuofvi,o+ sfkr27u b564? 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 weigain+xeqq2i .8( ocld8ht on the two crutch tips, each of which ii eq8n(.2cx8 doa lqi+s 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 areaa; 5)ndm4 sfrm 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 diameter suq vqlh1a z .;p/x5lri(nm9f, zpports a 10.0-kg mass. What is the stzaq.5qvl; np 9xzf/1hi rl(m, ress 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 lezm;fr(-n wf ;yngth and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of ;zyf(fn;mr- w 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 N is applied to one face b6x/()jus fch 5lix* wof an aluminum cube with sides of 30 cm. u6*si)bjc(f/5x x lwh What 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 pressure has 98kq9oqlt; 9*s,rj n ua nbgh6increased by 100 atmospheulob96 rnsk;tg qn89 jah9*,qres (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+0w; gjf(q0c76 ,wfpgoni ujs of 30 cm. The compressive strength of steel isjfu +0wsw6gp i nqj0, gf;co7( $250 \times 10^6 \; N/m^2$. 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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