Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary 9snc7cuw ;k+jk2wye eh1cp4 m(ot9q9 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 conditla5 .a eub6j4d,h1d xa2ed8pmions 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 rest above your head the gvz5m;g 1o 3muyl7) +lnkz)jfnet force on the book is1l;m y mk)5uzf )+l vnzjg3og7

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 neu f wnud2e9y7-rc9p 4yt force acts on itn ur- cy 94dy2fwpue79?

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 a;a8-mbb x +3wvpyx9h on each of two bathroom scales. Which stata8xw +pbbmx3;-yvah9 ement 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 onwf l;v9)tg.zf;8dawqt o g,* q a massless seesaw. If they both move forward so thvgqqzw tdloa,9f).;f8 ;w *g tat they are one-half their 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 end ix -ibua.29x-o:4v3b mmnk kf as 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 k.c*2dn tq (g*2 rsuuqtabletop 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 h;cafqhabfw*dl :t6p 9c2abdj z68d.kj, 2(gcm x 6.0 cm. One is stacked on the other, and the combination is 6hz(cb 8a2a6;2,jf 9 ckdbd:lfqgap *jd .wht 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 plact.5*8njwdv)lc9 lipr ed equal distances apart on the edge. What minimum masspr vj 5l*cld.t9ni)8w, 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 identicw sv443 )/:-co svvqou xaj-keal wires made of aluminum, brass, copper, and steel. Which 3kcx/ -uq4 )sw- o :vso4avejvwire 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 subjected to minimum tension of 36 N.w-z2m y,ycs( 53tkrg1-i1 hz awst8el If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tent52 zk-y1l-y3 hmtecz1rgsi 8s a (w,wsion 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 pointed arch or2(9y*g yi- y)n t;ufz:a ulh7t 4baeiu4r-yziy h 2t9 u go*b:);ye(natl af7s

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 from96ez5pcg i/dt6e vsn- the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite etn6 -ged/59 czvp6isend 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 dis wgv pe3g3ncol(e )),stance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much force must be exerted onlg(ec3 3,w)sneogv p ) 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 bala 1muc2zx 2bd()qzqpu; nced on a massless seesaw. The boy has a mass of 75 kg and the girl'zc( ;quzdqpx) 2m1 2ubs 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 uniform 1xe 31ajw /isq 9b)igyseesaw 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 ce e1 iq gsj1b)ai9yx3w/nter 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 Nux-1fw mw27crklk-5xb h +- v :6nubgx supports two children weighing 500 N and 350 N, respectively. If the support is at the c5 +v- 6rl f-7mwugw-:xhbukckb1 nx2xenter 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 the ends. brn qb6.ayxo1is.q:0gfz0had: la:ccv02+o If a 400-N personvyhxac.q2b fgq0z::1adsi+6 c l.0rboa :0on sits at 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 ropes at the et+qqwe(r e c w-qqv)1)wwm)5rnds. If a 400-N person sits at 2.0 m from the left end of the beam, what is the5v)rqtew cq+)q )wwqm(1r -ew 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./ h6rx nit-6vc8)m7(z- qwdortj;kpn The scaffold is 12 m long. A 300-N box sits 4.0 m p nqhd6 (-k)rt;c8omiwx-jvt6 /r7nz 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 scaffold is qg ek4zc( j,p*18 m long. A 650-N bo ,k4pjez*(q cgx 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 byih/k-lr ,h8*1oy.bz3sldya :pevl7 l a knife edge at the 50-cm mark and has masses of 0.40 kg and 0./r v.,lzbk8 3yplli7:1yohh lae *-sd60 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 100 N and lenl1gjo- wzo2e42 py*hjgth 8.0 m. The board is supported at each end. If the support force at the right end is three times that at the lef1 j 4gjlyoe*-o2wp2 hzt 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 place9q-i pz4qka3s6/mo p3vpydi 5d between them. Each scale is observed to read 2.00 kg. A pers5 d/poqzi3-a 9pp vqkysim64 3on 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 by a wire. A bird of ma u0;e:z9pz zw r;;rwucgiz5p4 ss 0.50 kg lands on the wire midway between the poles, causing the wire to sag 2.0u9 uzw0 pieg4:5r;z;z pzr;c w 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 cm o,rh)f: p i+fbfrom the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put (Fig.f,h:r)b op+fi 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 width of 2yiq+0umq nv,bag c( 4l (v9le8.00 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 inclin8q0nv9bgeq a ,+iy4uc l(vml (ed 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 Pi2u4 5x/ )yg+oqr wusefsa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m offq5y+g2x4 /uroe wsf) u 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 block by 0.(qw:ay lqe31l-t ;y2v4fheq) 6qo ffj0025 cm. How much force would be needev oq)l;h : (fft1jfqqlq yy3e-6w2ae4d 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 hau ywp7ww*4k,wi:w4 d0 b xys(xs 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 service station is 4.0 m long and 0.20 m in diameter. Ye (m;u2++ pi rqclnjg5oung's modulus for stuljg m cq2re (+p;+n5ieel 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 :y4;5ppm.b,efn d3 kwhe4be x a 6.28-N force is applied. What is the elastic modulus h4 kyeewdem n:xpp34, .fb5b;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 of diameter 1.0 mm and lengt kcs-(tb3n qd,y43nrrh 11.2 m. How much will the wire stretch? The Young's modulrnq d -4k,c (trbsny33us 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 crutcuy 11 of8eagn..e3vt yhes supports all his weight on the two crutch tips, eag113fotnu.ev 8y. yaech 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 arzyfh0 .b;2b),b/waeaqkew9r; 5pv djea 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 dy*lnhmf62 z xet55 x/piameter supports a 10.0-kg mass. Whaty mzx/enl*5 h5p6 f2xt 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 in diameter supports a 10.0vt vks-/yk1 y skh)r;:tiwgo3 06 qzg(-kg mass. wg zqkto;)16g0hss3-i:y k v (/vrkytWhat is the elongation of 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 djjak gj ,4o)jq9k./tto one face of an aluminum cube with sides of 30 cm. What ajj9kd4 ,qt .j)j gk/ois 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 in the sea the pressure has increased by 100 atvap 0c8siv: w(d ts,;gmospherv;d0g ,t8 svpc(awis: 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 stre/ zyy e01vom 4br(wma;ngth of steel iszryv/( em4aym; 1wbo 0 $250 \times 10^6 \; N/m^2$. 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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