Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equilnjvgp 97 t4pi-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 necess wqh4vcp 8kg;7u-co /iary 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 at rest above your hea0eiv8j,n8.sa ko ysl+8 fykf5d the net force on the book iskl85fskv88os y0ayijf . ,ne+

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 wi3z7-ot4*mmjsux ssm8xx ga) +7 0jlc21wawubth a constant velocity of 9.8 m/s. What net force a +lx a7 0zmstjjo*wm-731gcx8uss 4 u2xw)ab mcts 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 scafkp:oc2g;m 5c7py2yl.1yink i ldux; e h,g2 -les. Which s;5-72 iygyi omc,;ld h:k2x.lypunk2fpg 1c etatement 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 :,l5,lk cgby bgirl 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 wi,,gyclbb :5kl ll 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 isi ye0yaxc. whu)1d;i . 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 horizontax kog4qce6 hog50u k*-ue, c9gl 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 identica10fd1eh2s6m8vud- nn luu4ho l bricks, each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other8 d0uum6 4v2o1u1fl h sdeh-nn, and the combination is then placed so that they project out over 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 equal r f9kdnhys2)3distances apart on thknd29r) h 3ysfe edge. What minimum mass, placed in the middle between 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 identical wires made of aluminum, brass, r pq(7b9+b sa k2o+vuxcopper, and steel. Which wire will stretch the leastkoqv2bs9x7u+b r(+ ap ?

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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 subjey62s8 csya75)( sy)moosh nhacted to 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 tenaas5y8)s 2(hcs7 )nh6omyo sysion 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 the7rcsb0vw 3t8p:pu f j3 base of a pointed arch isp3s 08r7:bj cwtfvpu3

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 tw(r/0. rsxp1y* dc4dsp iws-lhe fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maxipswy1cr d/04sx*i p- wsrl(.d mum 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 fulcrurs oc)x5+,lppvb/:ca m to the weight to be lifted is 1./c5s+v ,pab:x)corlp 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 seesaw. The boy has a mas wd a.yibes2y)a8v.)p c xkx47s 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 must the girl sit on the otheri)4 ayvb2p dcxeak ..8) x7swy 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 se2 jhl)wr*bj5eg-1k 2p nd zbb.esaw which pivots in the center. Childbl w1kb*-n2erz. h 5 pjb)jd2g 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 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 wefyld1gnh e/b d6gp)byt :7: 9yighing 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 centerpt:/dy lybhn gdy bge 7961):f, 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 rop7o0. ap1y 1/ hsp;rbdo8xn lkces at the ends. If a 400-N person sits at 2.0 m fra x 710ps nryp/dh8.cbo;k1olom 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 xw),fn073xhez di2d3zh 1ctc 0vn i. k100 N is supported by two ropes at the ends. If a 400-N person sits hn, c zwh3z1vde d20.ti0inf)xx k3c7at 2.0 m from the left 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. Thec tp 255so9l v .(zw1sxu9epde scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tens lp dce1(wtp9o s552su ev.x9zion 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 18s3w55wunq yk : m long. A 650-N b: uswnkq355wyox 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-cmi d( )l2q)vyhgbbp;uf/tq- 1b mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectivelit) )-gvbdl/qh bpq y1b(;2fuy. 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 unifh6.3 eq(um9 n1yt7wv tqbkjf9orm 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 t fne769q k9bqtj humv1(yw .3the 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 of mass 4.00 kg is placed betroexh6ny;o78 vgzze32 rej-, ween them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale readszoryzer ejg7nx ;vo-36e, h2 8 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 byuo,,hyg.+iv rs y (l*q 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 neglig ,hvsug*yr o.q( y,+liible 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 arms ae3-golr towqzk4 7 9ece6,* has a 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 uppe ,-c*e4q z6lo es9e rag7wt3kor 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 base width of 2.00 m. I9ibrg9 i-/ls yts center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which it can be inclined wits 9ilib/-y9gr hout 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. The top ist k7 6; w*p4rsoaao4vd 4.5 m off centerd 6 p7k4w*at a4s;ovor. 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 muc/l*vi.*.,k4 zxnnz f gf9f txyh force would be needed to v*4ygxifx zf,*ln/9kt nz.f. compress the block 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 areatp:) st3s4e/drq/ u te 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 stationmp7. p* ql:z2jnr:yqablu 3+s is 4.0 m long and 0.20 m in diameter. Young's modulus for z: l2um*7yab 3prqqs+ nl:pj.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 n-cb t*: :o3r;dpe9uxckk. f w0.20% when a 6.28-N force is applied. What is the elasti u;fkxew-o:r:k39 *td ncpcb.c 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 suspen/x(yub -+lu lp7skh:gded from a steel wire of diameter 1.0 mm and length 11.2 m. How m(l: hp s-lb/7 yug+ukxuch will the 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 per(x- ux1pivytgth*t4 8ee9 eq0son walking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0e ee i(p80*hqt 4 -xyt9vtxug1 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 m p9dyuau6/erobru36o/ir 1 ou:ue ** 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 diameter3w ;lg*z 6exgrf3l(sp supports a 10.0-kg mass. What is the stress in the wire? (The36pr*el w gf(xzs 3;lg 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 a 10.0-p zy 3rcux8az 5,ic)8mkg mass. What is the elongation of the wire? (The Young's modulus for an aluminum i8yrmp)u i8czz3,xc 5as $7.0 \times 10^{10} \; N/m^2$)

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 3w 1vwx:l1dd/ r8vgp qof an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for alumin vw r8pqd :gx/lv1w1d3um 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 prejhra*a -);b oej19zvpssure has increased by 100 atmospheres (to a o1z*hj-j9r b)va epa;bout $10^7 \; N/m^2$). 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 compressive strength of)g ezm3: yp9vxz 8/shg steel is g/8gy:m) p zvhx93zes$250 \times 10^6 \; N/m^2$. 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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