Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equilibkty ,6-mh 1eisi (edq8rium?

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 stati) tc0(a6f uuzb q k53wym)1ahxc 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 net force on t9 zmje(luv9 k*xt ;t(j 23j lb-)eudoxhe book is 3x; b*9zej2djule9xt( j-(vm ukot)l

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 whetml6i0,van-hh-che 4i3( d06 xadgith a constant velocity of 9.8 m/s. What net fo i-ht6a64ev0n0, mhd3 cedh i(hgl xa-rce 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 ony egy/( hsgwf*v)d7 6xy(1 awde foot on each of two bathroom scales. Which sdy)61axw vfdh*(7y g/wsey (g tatement 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 girl are balanced rmygsyj*34d8on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what84*dm 3jys ryg 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 fpv/gf-)s9 ga1 e,p adsmall 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 horism.cs k71 qu-pzontal 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 ckrd( qr6760 ;cze kfvtm 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. What is the kz06fk7 qct6;drevr(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 supb:c/n r15.t5x 5 b rtphlzqgs/ported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge.5b5znx/ ttg plqsbc1:/rh r 5, 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 b.nkq eq 0q9c77 j,snjuzv w,5of aluminum, brass, copper, and steel. v,7we 05j s.9c 7unzq qbkjq,nWhich wire 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 subje-+y/lue l +ibh9ryz5rcted to minimum tension of 36 N. If the wire diameter were half as g-yui5rlbh/+z 9 rel+yreat, 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 buttressin )c8owevsyejawukl (u )- 9*t8g force at the base of a pointed arch is-uuk9y ca)w(oet8 )vje l8 ws*

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 disgm qn1q,d8pmuu-w:r 2tance from the 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 maximum weight that can be lifd182,pmrq: ungwq-muted?

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 fulw3-f2au 2wa bw kdht104u8 qd(jro1p6mkuc. bcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted op -84u.6uj o1r2ab3hu (kt0kdwf m 1dbwq2cw an 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 lm vlzc-- j84ng)k2pg a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If -4l-)mp ncl8jz2gg vk the boy sits 2.0 m from the pivot point 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 ends of a uniform seesaw which pivots sn1.wsp6 vknfw 8+7ogin the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B has mass gsvnpkn 6wo. sw+7f 1840 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 cu ncxdd oepg;5whb7j;4d7ty1b 2l )x ,hildren weighing 500 N and 350 N, respectively. If the support is at the center of the boardjb7d2 c;o7uenx ;dwg41bt x5pl) yh,d 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. Im0am pyef x-v;g,il.(f a 400-N pmpe;,xvy0 -f (gl .maierson sits at 2.0 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 10 0llovbhzt 087(g4 6kqs*ytajx i;j-q0 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,sjgtz;k7ytbl4080aq ov*i-lq ( 6 xjh 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 wire89dg,ulmu6*vq0 tv ckz+( p vy at each end. The scaffold is 12 m long. A 300-N box9vpm vq *udu 8glycvzk(0,t6+ sits 4.0 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. Thd0w-j4 -gtmg(j s3f ir9x vk1fe scaffold is 18 m long. A 650-N box sfmvgj0j3 4(f-t d1wxrs9k -i gits
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 supporcpdih4j dry) y,ab7 gk0j, +n5ted by a knife edge at the 50-cm 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 +0ij g7hy bj ,pdkcy,5adn)4rmark) 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 weight1ox y9l6o 5nx1/ umkwf 100 N and length 8.0 m. The board is supported at each end. If the support force at the right end i9oxkm6n ox f5luy/w 11s 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 separi ; hno-0sr(o+gda lg)pqa :;mated by 2.00 m, and a plank of mass 4.00 kg is placed between them. Each scale is observed to read 2.00o)-ng;a; 0o :a(g ri+lsmp qdh 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 separate v.gtgjui: :tu -8vy27mwc 9rbd 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 v7g8r2v b m.:wu- i:ctjg9tuy 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 hgdg ( uwv37*blas a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivou( bgg3dl vw*7t, how much force must the extensor muscle in the upper 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 ouw7s xx(/ 3n ;xcdt7(ef0xfq srter wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above tnq s/(dx x;ct 0fw(7 re3fxsx7he 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 5p w 3ia3r d8(r:nwpsr;if*i0u 5 m tall and about 7.0 m in diameter. The top is 0;(*wiis3r3uindfpr8rp aw :4.5 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 wokv3tg8)zcxuu6 6 k0jsk ayb95uld be needed to compress the block8z ka93xj6u5uck t 6b) gsvy0k 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 arslw yk2d9t7.a ea 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 stationuaf07v9 k owe8 is 4.0 m long and 0.20 m in diameter. Young's modulus897 ofveua w0k 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% w e)2myp)kni yl,u zq(8hen a 6.28-N force is applied. Wha(n82q,uez)imy ply )kt is the 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.g94ktdnolom5 ( *ehs c2lyw;6sqy3 d20 mm and length 11.2 m. How much will the wire stretch? nyq l 4ddeoy3l o2*km2sg; c(6h5s9w t 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 supportssf ;) d9ayapztgw.3) s all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What presa9p.)d)ts zs;f g3 waysure 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 dpi-whb8(fb ;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 diameteg pfq4ea wqp8mj4mq)-1f -f+ tr supports a 10.0-kg mass. What is the stress in the wir)fm 8p+-e4agw q 1 tfpfq-jqm4e? (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 a 1hr2 t 4gkh)o5px. zs*p0.0-kg mass. What is the elongatz r2og p)hk.tp45h* sxion of 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 applies:t z2ny q 3 lzvt/0aacozc28)d to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (The sy)ztla2n8az oqc/0z2 tvc 3s :hear 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 bq6n7xvg wo: hgqc1-( the sea the pressure has increased by 100 atmospheres (t(h1qn:6 bqog- xgcwv 7o 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 ccp-(y( b- ,qq;qw4iax3a z qanompressive strength of steel is ,n3(-cwxaa qb (pq;-zqy4q ia$250 \times 10^6 \; N/m^2$. 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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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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