Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditiormrfg to86i(nsg/h( lrb -64p ns are necessary 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 static equilibf(k0pdj;/u u4b8 mzjsrium?

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 abo al 0tnfxv 4rvh q-qem258:2kmve your head the net force on the book hv2-v2fqertm5:4xnlq m8ka 0is

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 velocity of 9.8 m/s. What ne yngg8l2 i5hz/t force g2y 8hlgn/5zi 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.9 ca,3e- dgm:iu;r oqrym6qf foot on each of two bathroom scales. Which s3 g-rid q:m 6ec,mr;a. qou9yftatement 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 on a massless seesaw. If they bopu.kp8k0y12 l2t qcoqss 4(ji th move forward so that they are one-half their original distance fjkpkt uy(qls2 0.1ic 8sp24oqrom the pivot 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 s rml+busnp 27 8e*v lutkj0b/;mall 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 tabletonyc1h l3e n+g)p 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 cm x 6.0 cm g02l+s((jzdrnvz) /dqo bpc6 . 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 maximum2/ + gdndj0s6zb)vo(lz pqc(r 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 gs irkv9 8hipwuvl9l4td2e1 ft97h.(supported by three legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two su h wvr12 lsip4tgevulf99idth7.89 (kpports 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 wireso42s5gh)xt / ie)idkm;pgkj 8 made of aluminum, brass, copper, and steel. Which wire will stretch the leasti2)) mhk5;x j4te8dg kosgpi/ ?

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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 subjectec 9ls z:6co1,pn 1zmtmd to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wi1,c9nc 6omplm zs1:t zre 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 pointjcx,f9 ,j; tn ix. h8p3(i, xcblrt1mged arch ijj (,fi3gcn ,t;lh8p i.,x9cr bt1mxxs

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 kfy9 7 3 8filuber.kh s n)4nyc+z1zx6emk18edistance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 4006y7.9n1cbm h)kr8uy seef z3f enx184ilzkk + 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 we,np8xz c/ fbg1,u- n 3o7uzudhight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted on thed,8zfuu 1nogn-xb 3/ czhp,u7 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 yx2+yhyj5l0d 2jy6(j.o se wchas a mass of 75 kg and the girl'yd xwj0yhlsj.cy ( oy22+j6e5s 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 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 unifo.bl ir-v(9vsdrm seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child Bs.(d b9-ivlv r 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 chqor c 00/ pm4kzfzts-+ildren 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 center, what is the position of the 350-N childf+/zsq0r0 kzm4 c -pot?

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 k,o 83*ezwvbg7;uz ko is supported by two ropes at the ends. If a 400-N person sits ao3v wgbozkk; ue,7z8* t 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 100 N is supported by two ropeor/cp c-gmcen r-zb6ga.4+h 1s at the ends. If a 400-N person sits at 2.0 m from the lr4g 1eccmn or c/+z.6-ba-gpheft 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 arvw9hmj+nl ;k))6 jyl . )cnhwire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the)jh r +w 6)l;kmaj9hl cynv.)n 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 8)(qjy (v;fqhz9 n oqaa wire at each end. The scaffold is 18 m long. A 650-N box sf h( 9j;zn(q)oqyvq a8its
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 support y:7pc2sy 6d:fjs o9l nwhci3h)4b b1jed by a knife edge at the 50-cm mark and has masses of 0.40 kg and 0.lib6syno3:y)c17pwsh 4 2fc9jbj :dh 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 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 10- xb0 yig+hmtm ;rl8e,0 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 the left end, how far from the8; +hgmmbl, yit-xre0 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 bjrb7*uz ))pe 2oe0hioetween them. Each scale is observed to read 2.00 kg. A person now lies on the j7 zbe0)po o*uiher2 )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 and connectedsdt7bi (w 01fq by a wire. A bird of mass 0.50 kg lands on the wire midway between the pitfs7 dq( 0bw1oles, 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 q+n-a of85y7o vl*u)bws tz2s and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exera+*l2o qtfnwz o- s5y)s7 uv8bt 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 whei/.ovuz mjkl957 m whk0j -yt2el base width 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 sideways angle at which it can be ijh t9lj7k.im -y0omu2/ z 5wkvnclined 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 mb6 r)f xhpyd9;tc8 z:t tall and about 7.0 m in diameter. The top is 4.5 m off ct8hd:y )zpr6;cb ftx9enter. 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. Hv.0c)tn0x f e pev*i1aow much force would be needed to compress th*f)01av. tixnvpe 0cee 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 area of 1 .:aa. yebd7hbmetk4/ $mm^{2}$. 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 sbutygw k2 b)) ww.5a:btation is 4.0 m long and 0.20 m in diameter. Young's modulus fwb b)ub2)wtkyga5.:w or 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 stgl497 k vito:/e /ghpfretches by 0.20% when a 6.28-N force is applied. Wh 94/k/ggvpi: oft7lheat 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 o+ b5impqy+ gf3kt r.b4f diameter 1.0 mm and length 11.2 m. How much will the wire stretch? Tf4 pm k3br +ig+tby.5qhe 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 o :dahgn q2/,zkn the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is exerte/az2 h: dng,kqd 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-a/x .ihuuq.k)b3 qm m 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 8jb66vh:en qjand 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's mebh8n6q6 : jjvodulus 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 diameh 5w4) 2z( (jrtm7own7ytxnketer supports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus forr z77(hmwjno4t5)2e( xwk tny 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 of an aluminum cube with sides occ5z:yh oh1u jvv.d7a 5ymv8di0 kw 91f 30 cm. What is the resulting relai7j. m518h5y vvuk1d c:z9 c yw0hovadtive 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 v2g.wxry kte;2fyn 7 pm a(uq2:/ lnm2xfjj*9 the sea the pressure has increased by 100 atmospheres (toykvxa 2npu ly2mrf:j9w 7qf.2 m/( *tje2x;gn 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 b) ks/oc*4zgx (hjd39bxk5e hcompressive strength of steel is cshjx3e9kz )d o b 5x(bg/4k*h$250 \times 10^6 \; N/m^2$. 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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