Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or con, bt mxg9i7)p., mkhbbditions 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 necessag5hvuwsu(- 5/)qud53ezvmk n ry 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 your head the net f*wb a6gbhna- :v rz36norce on the book i-bz6nba3g r vna* 6hw:s

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 co3rum0 dom 2dzo)zj .:wnstant velocity of 9.8 m/s. What net force acts o mzr o0. )ju2wd:3domzn 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 scales. co;(4 sc5*1: l+tmawkx xsg noWhich statem(ax;msg:4kx1l s 5ooc w*t+ cnent 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 lighri /0am9gf*jhs th9+l t girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point,h*g/9 il9hs+raft0j m 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 ia3nz*4kp0avor)e hs-ts small 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 istm:(f6hej37, qkabdw 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 dimpgb ya :6jyyxb074yn irud3). ensions 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 the maximum distance that the. yr):0ay3 y4bdu7bn jy 6gxpi 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 u g 2si:2)()l) bg(4fx fadt*fipbdmcis supported by three legs placed equal distances apart on the edge. What minimum)gc2g2( xibff)*)au d4p tfm(:b sdi l mass, 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 identic/5n6 7tv*h/ft 2rzjsrpe k fd6al wires made of aluminum, brass, copper, and steel. Which wire will stret5rndf2kpvezf /t j67*t6 /shrch 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 subje1 vl9,ow1f dpocted to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break wh1pvw oo,f9dl1en 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 baseq)9/bl *q /yeyzu1o kw of a pointed arch )b/ke/1*o 9wqyy lz quis

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 nw0h ,/ dq8i(ofvela0be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be liftea0w ned8,o0/ ( ihlfvqd?

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 weight to b8qsyf p5 uoq13 q, c,hua-5ipge lifted is 1.0 m. If a 3000 N rock is to be lifted, how mu-phyg1u uiqasq5foc5qp ,, 38ch 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 masslessp 4x4:dt mzj *dvn0/ye seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the bo:zx 4npvjmty/0*4d edy 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 shx b ( c)8psr, g,z,suxo72svuniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the center. Child B haxg ,,sc(h buvrosps2 s 7z),8xs 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 children weighing1 yml 8q6r/tjlc)kfx1b 9at56f:ik sb 500 N and 350 N, respectively. If the support is a) ql 5f c6:bysblm19atk1 ij/xt6fkr8t 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 supportq5rnb3t (j 5zd bk*/waed by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the be* n35djzwtbq (rka/ b5am, 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 ropes at the ends.i z2.lt fuy8t 9mvsx;2 If a 400-N person sits at 2.0 m from t;l.uy2vitzm98s fx2 the left 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 wire at each end. The si b0o h(fha:cf4 ,au0acaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is h uahf4o:a(bf 0,0aci 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 scaffold is 18 m lon b -f*vws yqk6d yb2vqle)ix;.)w3*dwg. A 650-N b6dyw.y )3b- qfsbqwvewvl *)* ;dk2xi ox 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 the 50-cm mark and hf t.xolrum 6oqm1(4m -as masses of 0.40 kg and 0.60 kg hanging at o.-6trq (mmlo mx4fu1 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 100 N and lengthrp*f6) rea8 rv 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 fr pr)f6r rae8*vom 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 mawyz zza.*nkp( kbk/9 qbfk6:.ss 4.00 kg is placed between 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 readsb6z9fk/akyn.q.bk w (zpk :*z 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 a :.iqtgs*a -z fvxi6k5nd 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 negligible mass, what is the te.- 56fg tx:q*skazii vnsion 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 CG3w y4 3vdx,jvqgk*pgv9 .to8 p is 12 cm from the elbow-joint pivot, 39k gpvqp3tg84dvv .jyx ,*wohow 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 outer wheel base widzg )qp/5i ewitd*8s5kb+- --mxzp cqw th 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 incli sd bwpgwi585z+ /*-q) ix- pq-zemctkned 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.n(vst,na eb;4ssx- ,f 0 m in diameter. The top is 4.5 m off center. How much farther can it lean befo b,n;(,xnvasst f -4sere 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 ny3h*rx .nt2zgvb7w j)p q21 n4je re8cm. How much force would be needed to compressb*zg4e3178 wn n vphqejj)ry x 2r.2nt 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 lonb wqbje+ v.)ru o 7n,:,ydmmx;g and has 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 servh;z*c - 90efivbdg p wfn2cl7wy; 6ys7ice station is 4.0 m long and 0.20 m in diameter. Young's modulus foys 9p-w vdw f yncz6l;i0cbg2ehf*;77r 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 force isv/z za8vh e,ipve(fs33.s6xt applied. What is the elastic modulus of th , 3xzpaie63(hf /vzvste8sv.e 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 diamete *xtfh*5w y;ulr 1.0 mm and length 11.2 m. How much will the wire stretch? The Yow*u5 xyth *l;fung'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 crutcheptm) tfu 3ce944bj0 k8tmcr0 cs supports all his weight on the two crutch tips, each of which j8m3cuf0re m4pc)tbc 94tt0 kis 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 ajvev3hzk gu9 j1an:) +zaz :r;rea 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 suppuv72;4rrfus x orts a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum is7 sxrf;u r2uv4 $7.0 \times 10^{10} \; N/m^2$)

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 aysz/ 76odic e o)jyc,+8p+wqind 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the+ide y6,8 qoc7 /j)ic +pyowsz 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 on .qj2c vcmq17le face of an aluminum cube with sides of 30 cm.l q1j27cc .qmv What is the resulting relative 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 eb+jnk 4; up2s1iq- /r xol(oain the sea the pressure has increased by 100 atmospherl1k+(r o/4ujb-i xen2spoa;q es (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 compressive strength of stz/44na(pwq)ee8fnuv) zb3 xqeel is/8p nb3))v xfwea qznzqe4 (u4 $250 \times 10^6 \; N/m^2$. 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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