Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotationqym.p vf1j). l fvout8ogd/1j1:z b 1lal 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 static equilibrium? -byqmng7 f(x(09vxccp5i .mqidg +v 9

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 abigld85 /rxc. bxz- -ggove your head the net force on the book i cr5/bg-l.-8dx g zxgis

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 s:d1y2qx5frhgb* 2kovelocity of 9.8 m/s. What net forohx 1b:d*5q2sg2yrk fce 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 bathroom scalescnffz pi-q95u /3 d/uv. Which statement is definitely trc -5vq/fpnui3 d9zu/fue?

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 lixhy c w((hv-+jght girl are 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 happen to the seex+- (hv( hjwcysaw?

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 iq3 vjrwuz4;f9 s 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 tabletopo7bq/q, ,g trs 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 4rt8iw k p/tml/ 7-qd.b)lygg 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 ofig pgd/mryl4t.wbtq-l )7 k/8 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 pz;uh +c p9t,t4p 9:m ssfl-g8kn-tjjlegs placed equal distances apart on the edge. What minimum mass, placed in the middle between two sths :-z4stlujj9pg+ ,mp -ft9nkc;8p upports 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, brasv zi- c)wi+ ol9xe.bdv4cma,:s, copper, and steel. Which wirm +c,e4 9axozb.w: ici-d)vvl e 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 subjeclvx0d6ijnb dy6m upr63p w0fa f+9d(;ted to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break whenx f+3p6dbw;6y aumn ij60p(f 0dr v9ld 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 forcebw v( zxe.3ai0 at the base of a pointed arch i0(vbz3ew .aix 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. Tjcgf25dc 04ge he distance from the fulcrum to the weight to be lifted is 1.0 m. If a wg edc 5jc2g04forker 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 fulcrum to the weight to be lif8xld,ac0sbauc;h(pqe q41oam )* jt9 ted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on tolta,d40;q a(*jcb9axmh)s1 cu e8pqhe 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 k3,mx mm0o7rh 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, where mumk0xm 7h 3rmo,st 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 pivots in+g.qzia9t- ou;t7wlyb5 bgqd x,w 2 (u 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 B sit for the seesaw toqg7ayww ;+l(bo.zixtu2 dg,buq-t95 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 supportfzm/ vf4p a.p;s two children weighing 500 N and 350 N, respectively. If the support is at the centmap/4fz.p fv; er 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 100 N is supported by two ropes at the ends. z) ,:fy23ov;sqlawg.knd9u z If a 400-N person sits at 2.0,2 qf dn9) y3zsvug.kl:w;oa z m 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 thc. y( 6dspdz16kb /zlre ends. If a 400-N person sits at 2.0 m from the left end of .cr/kd1b6yl6 zds zp( 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 scaflsdhryc(l n o,mi;- 4e*r6tl1 fold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension inl;l o4rnmsl1ydr - (e*h i6c,t 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/up:6/d t4 ok 6,jv;7i szgefnxwjns3:w z:ra 18 m long. A 650-N box sitse3w:u,g4zxjw 6/:ptfnj n/ok a 6d;7:rzsivs
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 aof jsj*tfi2v( be - p+hzq9:28loux*gn8 .gvlnd 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 0.30 kg be hung to keep the stick x2 ozeqloh- g+ ft*8*(8 gj9vj.vi2su:b npflin 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 m. )vn8o5 eo4yr6ynfw9 d The board is supported at each end.edo n)fyy8o9nw 6r45v If the 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, and a plank ofp6(1ij)st laiz(n5s p mass 4.00 kg is placed between them. Each sca)jta (6n (5szl1sip pile 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 an eo1qeqf9+i k:d 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 belq1 +eiqe 9fo:kow 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 ise r:c(m iix.l. 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to ho.r(c mi.: elxild 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 of grav2,k oj rxw,i7city is equicij7wok r,x,2 distant from the sides, 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 diameter. (6fzfo y:+0swk9e sth The top is 4.5 m off center. How much farther can it lean before wszhs +9y okt:e0( 6ffit 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 0.0a ct :my8kc * ns)2sbi:xp4:k-avczz /025 cm. How much force would be needed to compress the blmi pt :v sy8k:2 *c-b /xz:caznkasc)4ock 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 a cross-sectional area of 49 2 .zerbofii1 $mm^{2}$. 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 diamedzwg8hlcc e;eb0c ;h,2,zh m :ter. Young's modulus for steel is e c2cezgc, ,h;:hl0wdhz b 8m;$20 \times 10^{10} \; N/m^2$. 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 force is applied. elz-m7 9 rb6br What is the elle9b -zbrm76r astic 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 vmsgy;wu( *s0c0 ql( d) sqby.wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus for steelcs wgmqs*.yysub0(0q(d;)l v 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 syhs d,8 f9,onsupports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 8nyshf,o,9ds 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 area ymg;n43 gcn2, ugapbp*+s.it 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 2r ag+:j+32,lopidvt vq tz w)1.0 mm in diameter supports a 10.0-kg mass. What is the stress in thdv rjzo+g pwv q i2,1t:+)a3tle 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 length and 2.0 mm in diameter supports a2lyzmea.d,-k f 0xje ,jw 2f9p 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an alu,f9wflke2p,-j.20 ya mzx d ejminum 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 appbht,:oo ru d .boyoo9(w-z r**2rm(sslied to one face of an aluminum cube with sides of 30 cm.(ous(ryo**bwotbr : sz2,o9d.rh o-m 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 pressu+bfr.dr7ue;nsw ;ga(j h5r( nt 06 pexre has increased by 100 atmosphejre pba0 fdw. ;rr t7s5(h+n(un;egx6res (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 of 30 cm. The compress9,q*efm,x*j s d a)apjive strength of steel is,x*s 9j ,mjp)efq* aad $250 \times 10^6 \; N/m^2$. 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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