Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions s*ukw nk 5hgh5v- pfm ;,ves,1 *fh2piare 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 ar hm08l5jrp x1he 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 rest above you2r8yzddvgdh 5f 1oqlr9x 4,- ar head the net force on the book id, f2qa49z5rox8rdgd y-lvh 1s

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 nec gcz)zt ;/s-7nt+jcft force acts on cczj; ng t/s7t)f-z +cit?

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;t0-ikveue n4 x jc(mkh ( f.n8hcm2f:y) v;ru foot on each of two bathroom scales. Which statement is dee rfvh.8 (henumxyf ik0- j;ck)2cn: u4(tv;mfinitely 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 balancuvzkn( rt7spx1+1h d,ed on a massless seesaw. If they both move forward so that they are one-half tz (1p 1tdknvh ,s7x+urheir 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 afu/os92 n+o 0t1ox;b8ayycl 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 is /yy. i xux1:wuin

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,m3ur3c db9ja m9hyq44s*i(/o kr0ltr each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on thr9 d 3 jyr/u0is qa4k3t(*c4brom 9hmle other, 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 distw*.tv *cbw0pd6q9 wzf ances apart on the edge. What minimum maspdw. wqwf *9v60z*tb cs, 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, copper, a oq+rw30n5xv nnd steel. Which wire q+nn5w0o3xr v 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 su l3:ae-67)tq.pfp rkbnppq8 fbjected 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 tensio btapfneq f)6:pr8k.q l3p 7p-n 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 the4pjy*l 1kfv(l.bx-wx buttressing force at the base of a pointed arch is w*4-(l1xxv kby j.lpf

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 (c.ac dq+y* gksq5m 6o/khp9ato be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight thatm ha6kg/qqcs 9.k5acdy +*p(o 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 longsg gyhm(mu+a3gg8*t 3. The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to3 3+(mmg8 yughtga*s g 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 balanps6q62 rz:qh5 c8kmlnced on a massless 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 the pivot point on one side of the seesaw, where must the 2h k6cn5qlm:8ps qzr 6girl 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 lm2c- td 7*rs0o gta)xuniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B hsr d7*l a2ctgo m0)-xtas 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 sup5tjuhkcd j8m/dt ;t8ovb2q9 .ports two children weighing 500 N and 350 N, resddh uq./tv88b5cjkj;o 2mt t 9pectively. 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 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 thk me-t)t41uloe ends. If a 400-N person sits at 2.0 m from the left end of t1e)tkm-t4ul ohe 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 kbg h763 r20w :cx wcfqwp3s(ocuro. )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, ww f0rc:.)co3 76osw hqw3(g2kcx rub phat 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 scaffoldqtb1* wlyz )t;jj:tm+ is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in each w zq j:+l1tmbt y*)jwt;ire?

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 el)cr0ux( 1tncqvgwod/ggp6-tw 7 )-xnd. The scaffold is 18 m long. A 650-N b- g6pc-)x0gtd 7 lq/nwr(w)1xgt vc uoox 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 thfo wx/itz /k:wi,nj;hxq5 e0 z() ua+ae 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cmijxfh:it+w(anz0 a/ze,;/w x)u ok q 5 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 100 N and length 8.3lg h ck+:bmci( -pft5s1i3oa0 m. The board is supported at each end. If the support force at the right end is three times that at thelm+h c-iobi1:a gsf5 pt33c(k 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 rk*gr-i+wa190x zn+s.zcca k.. e kklplaced between thecl1cgkik r x++*.09n e.azz r- kak.swm. 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 separatm b.y;x *j4whked by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire midway between the poles, jbmw*4;.hxyk 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 and its CG is 12 cmy5bm9 n /psi y0sctbpt-9 i1o8 from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7y sto iymp 0ipntb95b8-1/s9 c.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 w02rh/6qpp)btx u,kk:o )xzxg idth of 2.00 m. Its center of gravity is equidistan2ub p) oxzhkxx/qp0:r6),gkt t 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. The ) )wxg5+ob dnttop is 4.5 m off ceog)wdnb )+x t5nter. 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 stezk y8 ovnb(7pn9) 9;5 qmagq24vlvcfqzyyl2 5el block by 0.0025 cm. How much force would be neyb 8q7pcv yv 5mn2naoq;4zqfy 992(vllk zg)5eded to 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 reyighx g,xm 01.tijk 48*6z.nbbs. o a cross-sectional 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 servfj d6kj;mml ):ice station is 4.0 m long and 0.20 m in diameter. Young's modulum kjjf;)ld :6ms 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% when a 6.28-N forca wgak4cma9+ 1e is applied. What is the elastic modulus of the4a9 aacmk+1wg 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 suspendedesmrs+i h785mj uo-lt5,utw4 from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretc-r5seo,5 7jhmu4m s8tiw+t luh? 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 supports ve+k gu(nx d8* +ago4dall his weight on the two ag*eo v4duk+8gxn+( dcrutch tips, each of which is circular 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 area iobu+z 30c mw7of $1.250 \; m^{2}$. 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 lengtq koog b311)ocrsgd. 3h and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus .cgk sbo31 d)o rgo31qfor 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 suppor;tq tw21jvfo ahdx :0l/jq:(uts a 10.0-kg mass. What is the elongation of the wire? (Theud(h /xtqj1:2vwq;o lta f j:0 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 face of an alumo y ,sb/dzo73vinum cube with sides of 30 cm. What is the resulting relative displacement? (The shear modulus for alum37,b/sodyzv o inum 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 pressam tb*k p;fcm*o1b ;5oure has increased by 100 atmospheremk *5 o*bp 1;;bcaomtfs (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 a6hr- yvg)0b(ylm2k5j/j fj fk diameter of 30 cm. The compressive strength of steel isg(kfb /5y0)hvjk rm-62j yf lj $250 \times 10^6 \; N/m^2$. 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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