Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are )i7mh4 nrpfe5:at plg3 ;qjz (9/froenecessary 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 necesl 3f9x8cea0*nuc u f*jsary 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 n a00ih 2uo5qzat rest above your head the net force on the book iou20 q5zi0hn as

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 wiju -ra1i e4m:mth a constant velocity of 9.8 m/s. What net forceumm j a41ire:- 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 footrza0m;e 5o4z qwx:h v4 on each of two bathroom scales. Which statement e;q0:xzhram4oz 4 5wvis 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 1*rinux2yr ,oare balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will ha x 1ior,urny2*ppen 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 snpniuswt,90qt7 vf n8z/30zin

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 horizonn(rn r1vz:y nwg *hr8 rvt76r.rwy1v,tal 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 x 10.0 cm9kscfjx9)o )vdoik2 c3)tvj 8 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. 9vcj)vt cf dk j3s i)xo2ok8)9 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 thrbw9 lwa .c44qtjsi8wg 0qps8.ee legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will aw.l4wjp 0qsws48qg tc8b.9icause 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 ide:ta5- c6umvkj ntical wires made of aluminum, brass, copper, and steel. Which w:t6 -ak j5uvcmire 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 when subjected to4v)) d4s (pbhhpp8jh r minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension sp)rh4 (j 4)bd8hphvpof

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 componendzxef:q3.q..,r 8 za ti.htirpm0r .zt of the buttressing force at the base of a pointed arch i.z.zp. q eihqr t0:f8z3r i.a.rtx,mds

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/4l eybnbeqp7tn5h3iyn -o-1 be lifted is 1.0 m. -41lqbyn/tpenbne 5 o37i h-y If a worker pushes 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 fulcruo/hj:ry ylniw; sn;u k65d59mm to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exertjok6 mi w5 ynd:;l; uh/9nr5syed 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 masslesza+q p-2+4kp gg 9babj20h jzbs 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 pg-09+ pb2j2paz 4z aj b+bqhkgoint 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 bs0)pn 5h/3upe9rr x cends of a uniform 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 ceuc/nbr9r sp0 hx35)phild 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 7wwfuuoeboiac9,f3 7 :gb;. stwo children weighing 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 ce7e guwff7:oc,; oaib 9w .3subnter, 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 hx9i ;d /rs56to.mqqhby two ropes at the ends. If a 400-N person sits at 2.0 xhmti9;6qo./qh dr 5sm 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 by two ropes at the ends. If.wu-)k-p t reu a 400-N person sits at 2.0 m from the left end of r.eu)-k- utwpthe 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 j87uj nfc:5ii09l n acwire at each end. The scaffold is 12 m long. A 300-N box sits 4. 7i0aj9jn5nc8u cfil: 0 m from 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 186bb:m o-g.rdpuzn;l(x nm7fu p: *:df m long. r *p ; x(d7:go-::lndubfpbnz6 mu. fmA 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-+rsv u3wuih4+cm mark and has masses of 0.40 kg and 0.4wu3+ sv+ihur60 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 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 length 8.0 my9,l*iorm9 v,vfssz t* b-h(p . The board is supported at each end. If the support force at the right -(o ,s9* lh9btmvy*r, ipszvf 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 2.005dm3v yr;wk2 w.v/8 cxmob a+e m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A persww emk3+barcyv;.2 o5v /dm8x on 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 separnwc,adnqo b003cs6 ,e ated by 40 m and connected 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 negligible massq s603ccon0dan e ,b,w, 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 ad2a+v)1 2r)sver vqpx):qc vp mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm vd2 cq+ vv)s:xq)1)vepp2r rato 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. vac.njerice5 7bm. le -52k9f Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. Whamebiea29crlc7n v . j5.-efk5t 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 7.0 294 1vqiknz lxv.)qyxm in diameter. The top is 4.kln4yi zv2x9 1 .qvq)x5 m off center. How much farther 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 by 0.0025 cm. How much force f8d mbp u 9vpb;+2dv/ad, ;j3tybfok6 would be needed to compress the block by 0.0f d+avbpmj;,vyb;k/6 p32obddtu 89f125 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 cross-sectional area88o i1ucupz6 -pbim(g 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 av9r1j-8r;u ajopcnb: nd 0.20 m in diameter. Young's modur rj b89ac vupj:on1-;lus 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 0.2 i:- y2ps:xnz *x/4wx+fp brzr0 mm stretches by 0.20% when a 6.28-N force is applied. What is the elasticrf+4zpn/xw zyrxs pb-2:i x:* 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 frozuhd/1h/ *3y cj33 umtm djip7g4/iggm a steel wire of diameter 1.0 mm and length 11.2 m. How much will tmj3/yi d17/hgptz3/dgicju u hg *m 34he 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 crutches supports all his weight on w:-hpo8z oi 26 o3xdunhsy:e7the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerted on ty8w6zunhpx- s e72oo::ido h3he 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 q 97iycfa uh.p1b6onb7vl 1l,an 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 and 2.0 mm in diameter supports pgjrrgl /0;ypdkg a ;tb 0:p(a8u8gm fem4--aa 10.0-kg mass. What is the stress in the wire? (The Young's modulusbpgajt8gp0g;80 mr mk /a-rep guy;a: d4l (f- 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 vg;8 1bskg5;q ms,zysg3-zzwqqv3i6 .0-kg mass. What is the elongation of the wire? (The Young's modulus fo-v 8sqsg k6zz3q ;zwys,m3i ;vgq5b g1r 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 ic hi+-eumm2 j0s applied to one face of an aluminum cube with sides of 30 cm. Whatu2mhc +i -e0jm 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 increased by 100 atmosphe4u6i*lcptiu uxj(q( :zvi+ +o res (to abqjuv6+ito:+ 4(z*lci x pi(uu out $10^7 \; N/m^2$). 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 ydgaf8 eil5g(f 851 me6 p6uqecompressive strength of steel is g6du85(ef61ap5 g yqmef ie l8$250 \times 10^6 \; N/m^2$. 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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