Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions axc.zmfmv7nb/p:qz: 6 re 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 equilfs7f7 6jep*hj rs8,b jygd 90iibrium?

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 the book /-gnw6f) alhl:0oezcf6 lozwn g0:-)lahe /cis

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 m*/.g /j -l6e5qm bhmblru qh/constant velocity of 9.8 m/s. What net force /5/ e bqrglm6ml hqjh.m -bu*/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 wit5x),1 gstyu1k9qdp au e+xu0dh one foot on each of two bathroom scales. Which statement is d eyx xut1 kdqpu9g1a+ ,s50d)uefinitely 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 massle9.b+ d29n lvbtpfkwb. ss seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesawk9.p 92tn .vbblb+wdf?

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 8r)3jtt :d *gou6fxln ur nn+)rb*,vy 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 aynvxdw+l u02rtj*z7 du9g2+ 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, ea,6ch.u)i7s v p x 9wrkku:w(hgch of dimensions 20.0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and the combuk(vww9p:.s) r g,x ihkc7u6 hination 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 thr*wnmt/(feob/ et.y iot10)-ql l wi z)ee legs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the iw- ))zon yt(/oe/ f.b*0ltlmit1qewtable'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, copwd/z*0vn t;jzlb+*9r qt 0 ra4ptp)soper, and steel. Which wire will z *w*l4/)9+d t ovppnztqtr0r s;0 jbastretch 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 subjected to minim 6( m8irr pm1t.lm:,npy lm9jsum tension of 36 N. If the wire diameter wermrn sy6 m tjp :(r18lip9m,m.le 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 wj q3f9 1wuj;cm* /sl6 vitl(bbuttressing force at the base of a pointed arch isuvws jl1iwql6 /bt*(;3jf9 c m

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 distancedw91 m-t5we yb from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes o-1mwwyeb9t d5n the opposite 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 the fulcrum to the)5ytaoww;fiue:6i..x ej8yi weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how mucux6w.iai8 jf)et.ye i;5wy:o h 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 mass ofkm1bb,ef j,, z 75 kg and the girl's mass is 50 kg. If the boybbk 1,me,fzj, 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 wmu(y2s;dt g2 6q3wp5m xvhn(opposite ends of a uniform seesaw which pivots in the center. 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 6mgt 5(2(3mhs2puqw; dn vx wyfor 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 suppr5: sx h17;tl5*piuit v jxq1rorts two children weighing 500 N and 350 N, respectively. If the support is at the center of thh5 isi1 tu1vx7:rl xq;p5rt*j e 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 + t)ovl2twb + bc9mo p3lo(s/oweight 100 N is supported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left l/v (m+bp 3+soooo 9l2b w)ttcend 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 rope0c c7luf5d/hes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is the tension in td5ec f0 h/7cluhe 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 4:a8llisy eb3;8bfqig p 7vt.scaffold is 12 m long. A b 4bpil7e qf;gl 83vts.8 a:yi300-N box 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. The scaf io:.q 0;uzw0g5yg;f eorms+t fold is 18 m long. A 6i5g s geyw:;+u;roto 0qf0. mz50-N box 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 qrnce wxaujja(1y,6o o* (h:x+f*2mw knife edge at the 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-c: ajjca2w(en (wh 1uxmx,r+6* *oqfyom 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 weigh;f*b latt3zh /rr-y(m0u p7m r9jts zy(5s 2aat 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 the left end, how far from t905raaym ;s7r*zf abtrzhtpsu-jt/( m2l3 y (he 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 isgz6y.khx 8- ew placed between thez-g8.6h xy ekwm. 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 connected bn1eeq o--lql :y 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 negligible mase1q--q :e olnls, 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 CGfu;hrx,o5(f1wofqkup4n5 k os v54i- is 12 cm from the elbow-joint pivot, how much force must the ext u nx h5kks-uw1opqf5r4o5iv(f; of4,ensor 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 outer wheel base wip2lct2)zljeao t5f f 6/-ta)a dth of 2.00 m. Its center of gravity is equidistalt-a t2tz5e )aj)fa p2 o/clf6nt 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 72rond -vl e gb*l2ixffl p88.b2h9xl. The top is 4pnoll2*29lx.b gerl f8 i bv f27-dx8h.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 bloo, -f yo rh.7aex086.xt k+yjvw;rifqck by 0.0025 cm. How much force would be needed to compress the bw. +x o ,a 6fit7-rq0fyorkvxh;8e.yjlock 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 c0ex74). yy /hlikntx$mm^{2}$. 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 station is 4.0 m long and 0.20 m in diamw p: 81ilf(aa6t wsu9meter. Young's modulus for steelm8fsai9ta :( lwwp6 u1 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% whee72je. hpyy+kb,op-kn a 6.28-N force is applied. W2o. j+kp p,-7ehebkyy hat 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 w8t-h hiu. llb6h6.imatqk1z 8 ire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? The Yount-i a8 1kmqhu lz8t6lb h..h6ig'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 onfzj 5qh 3ieqnyn,7 lm)5;n ajg oe;v.q 8f)k*u crutches supports all his weight on the two crutch tips, each of whq)m;l yfeanq.vq,z;u8e57ngi h *n3 kj foj5) ich 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 td y u40vg2ew; m(apb)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 l.t5 ),w(r yyoo8etbwo ength and 2.0 mm in diameter supports a 10.0-kg mass. What is thttw( oyo.o8ye b)w, 5re 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 in diameter suppo2)x kc/y91w7amk0 shldsa8; xsyhdr7rts a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an xdlmk 781/sdr wys)ch s0; ayxh9 72kaaluminum 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 je 2 8uzd )wb;,w,sysuyni: (eto one face of an aluminum cube with sides of 30 cm. What is the resulting relative dis swdu )8e:e,(uz,yi yw; 2nbsjplacement? (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 the sea the pressure has increased e:.wt: omyb0ijl gcf/sk,v huc +i)0:by 100 atmospherf,g: j+sylc:b ekm 0)/ v0. :iwuciothes (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 a diameter of 30 cm. The zw.; ln--,:4v/n xuss th +bk6qudrijcompressive strength of steel isjulwk4h-+b t -niqvs.x;r/ sn:d 6zu, $250 \times 10^6 \; N/m^2$. 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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