Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational uzlm75) t1j3 fr5xgo kequilibrium?

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 con 1(qgm6i;emwsditions are necessary 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 ,.+5v h j7ulxvgi.avvw(sw y /rest above your head the net force on the book iya7+ wusvgw,v( l/jv5x..i hvs

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/y 5cn0bb8sn dtjr3 x2 outer space with a constant velocity of 9.8 m/s. What net force acts on/ jbr2yb 3ns 58xntc0d 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 sc8;f59g zfb0t9wgvj5 arcf tc)ales. Which statement is definitfwjf;t 08)5g tv fc9rb9z cga5ely 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 b tjgy6a. /zbm)18 lvdbalanced on a massless seesaw. If they both move forward so that they are one-half tb m1 zb)al.j /ytvd68gheir original distance from 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 small g;cupfd2kh-/ 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 tabletop+)6nq0m rt*dwmd)a/e jw idm) 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 o/ ,zo ,dz;ljlsf dimensions 20.0 cm x 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 of a table. What is thez, o;ljs ,z/dl 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 threu p)wgbqz + q+rra+9 v14/rfrpe legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, wilz4+9bf/+vqprag+1 w )urrqpr l 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, brasmlxcr5y 70 5cvbsqtot j7cu *i,0: wc2+zdg4ws, copper, and steel. Which wire will stretch theq7l tc 5tw 5*400s 27zdx bv+,cmcgwj:yrciu o 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 b3e uc -3mwi myt3 sfe;-kz2x)qreak when subjected to minimum tension of 36 N. If the wire diametts- exyu2 ;3km cz )i-fwm3eq3er were half as great, 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 buttressing force at io:u ep1ed5ua khfpq(my;igj/y-): . the base of a pointed arch ieh:p )d5y/oj:; g1kuy - peiuqf. i(ams

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/ b*enix)l/.n d; ;vziaau4pv be lifted is 1.0 m. If a worker pushes on the opposi*dx ;ze;v.niiu4 /a/bp)vl an te 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 tyl)wo)0z(ps hayo to ygl4*0,he fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is ty04p zw sog ,y( ao)ol*t)0hylo 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 mas p 5zk nsc(enu5 ; oo hazmy.lgg+/67j-7rbd/jsless 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 thgrj a -7+ ju7m(;./n z6o5sn5koz dpeb/yg hcle 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 in the ce7 5mg1r4n3xscc we*.s,oa s rjnter. 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 to balanm51c37 go4ss,jwx.c e nrar *sce?

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 weightg2jjyf0a0j5 p ;3lfui 40 N supports two 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 center, what is the position of u3ljy02i f; 0j5fjpga 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;tf+141qnpv dffb3oi weight 100 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, what is thenoiv14fd+t1 qf 3;f bp 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 huh71 1v *utqg blbl p83ymv,:weight 100 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, what is the tension i 3 ub7*ptq1h:lvumlhb 8g ,v1yn 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 amv5b:ror)ikq zcl;,9 wire at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the:v 5,czrbmr)oi;q k l9 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. fb-d t qi- j)wez:o)c wu,p9+o The scaffold is 18 m long. A 650-N bo zjwi q)ocd betu,-f)w9op:-+x 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 sup cmh(*)v-h9v5aw zk eomjn;,y . :buxaported 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 mark) should a third mass of 0.30 kg be hung to keep the stick h9 ozm;)(a b v em:.jxavhkncw-u* y5,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 univtp - :i+nx0v(4civsd form board of weight 100 N and length 8.0 m. The board is supported at each en(d4 x0p cniivsv-tv+:d. 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 m7f2e9q+ h jjm2.00 m, and a plank of mass 4.00 kg is placed betweenjjfe q2mm +97h them. Each scale 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 and conne2aj/4nhv8mdhj*c, rt cted by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, causing the wi 2hvrdja4/nm c 8,j*thre 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 o2;fb5qlid59zvy o+ es nh3:q nf 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor 5y9l5e+n qb:3;izfdqoh nv2s 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 anm/d 5 e6qj3;),ayejf5jm yfab niw6 )s outer wheel base width of 2.00 m. Its center of gravity is equidistant from the sidesn5yjqj3 w m;diam 6j y6e/))bsfef ,a5, 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 abo4qmfymy(:+ 7 bbv k,tiut 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean befk7tm (y: + by,bviq4mfore 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 swy*;wqm 3x4iy nx;e *hteel block by 0.0025 cm. How much force would be needed to co;x4 q xe*w i3w;myny*hmpress 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-sectional4td,l 2zd -nhf-qye2 l lmpo1h331udh area 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 servic-7k 1a+*;n5nr0 cf ypkqwb ctze station is 4.0 m long and 0.20 m in diameter. Young's modulus for ste+-w7tr5kc1ykc fqb ;0n* apznel 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 byjehbf f8c3wgs f 5n:7/ 0.20% when a 6.28-N force is applied. What is the elastic modulus ofe3fhbgwfnf8js: 7 /c5 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 suspenu7 ) 9 w5jvvlvcy0jttk4uk c)zpvm :09by b+1wded from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's moduw7 5jy90kb)k:yv 1zu )jl90vcv mp4t ctw u+vblus 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 hpbf4wv6f o5 w)owa8e4 is weight on the two crutch tips, each of which is circul6ww4opf ) 8fweab vo45ar with a diameter of 4.0 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 h ij 2qby,n mg(q-c-5darea 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 suppoo-; p r9gr):mosrrn vvsva :96rts a 10.0-kg mass.v rr:):mo6s;gas 9nro rv9 -vp What is the stress in the 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 iou zs)lm l3ny.vpjni; .qduat7d.h/ p3)w m96n diameter supports a 10.0-kg mass. What is the elongation upzot7v ni n933dlpw; )u ay.qd )h. lmm/.6sjof 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 applied to one faceo 2i1)c f.mop9c jwza, of an aluminum cube with sides of 30 cm. What is the resulting relative displacementf ,zm.p1 9aocw oj2ic)? (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 ct5z8- zvl1. bj,yiwea+kr ; fin the sea the pressure has increased by 100 atmospheres (to e5- crty1zb8jf.w aki,vz ;l+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 c 6 ljncqmf5iuw;)de, ;m. The compressive strength of steel is q)5;,;f jlncwudm ei 6$250 \times 10^6 \; N/m^2$. 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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