Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rotational equicbi/n/y h44uo dji+w-librium?

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 equilibij0dq+m5bve +sri l 3t1qhh3 9p 2djz9rium?

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 1p+i wqbfw7b3 above your head the net force on the book ibp71i qwb3+f ws

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 througe)t fsysyn 8)xle)t/ .h outer space with a constant velocity of 9.8 m/s. What net force acts on ixys/fe). ste)ly8n) tt?

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 , t4uuucl:ccz (s/dsq q 7j,v-each of two bathroom scales. Which statement is definit,: ,zstlqq-4c/cv dc7suu(uj ely 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 bala)pgi-a+h2b q- 6wy pv-v wov*anced on a massless seesaw. If they both move forward so that they are one-half their original diivb apwy* +2 v6qa---pv hgow)stance 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 ittvj, n,/i*0 vwq 0wdsjs 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 is bn0,jrk ;fnk )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 briy71bwa8,er vj cks, each of dimensions 20.0 cm x 10.0 cm x 6.0 cm. On, v8re71awby je 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 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 puj igx884rh6nlaced equal distances apart on the edge. What m86n84h ri ujxginimum 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 identical wires madexo73c) dri6 gq of aluminum, brass, copper, and steel. Which wire will stretch the lea rg)6qicxod37 st?

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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 / tdf4li8q7tu dl v3d-break when subjected to minimum tension of 36 N. If the wire dia 4ftl/3lvdudtd -q7i 8meter 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 buttresc) q0n nse,q/l8 ipe:nsing force at the base of a pointed arch i en:8sp)0n/qq ce, inls

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 we+7+en e+mtkpiy/ dbxrhff)4 2ight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum wex t)e+4fhi72nb dre+/k pf my+ight 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 longv)3d)gpy v* *lex+tbz. The distance from the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is t* z))yxtlv eb *v3dgp+o 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 massless seesawr +2 x0 w-z8vpdpxa9deyj)3ij. The boy has a mass of 75 kg and the girl's dv- y izr x90xad)+ p2e8jp3jwmass 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 seesaw 2hq i)5 tmcar*ec-lv5 which pivots in the center. Child A has mass 60 kg and sits 2.0 m from the cvcc5hlm 5)2eqt i*-r aenter. Child B has 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 sn5yc2eb4vz2 supports two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N2 5n2eb4c vszy 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 ewvssrqwf) 0+3a:o ai 8nds. If a 400-N person sits at 2.0 m from the left end of the beam, w)or+wisv :8 asfqa30w hat 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 ix1pdoi:wx,(m .ta3j .r0uy vas supported by two ropes at the ends. If a 400-N perxx3:ot,.w0i u.va aypj(dmr 1son sits at 2.0 m from 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 1hq-dgpl8a cb 3wbn+ -at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What h q3+w pc1l nb--8dgbais 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 w*lp )xfj449in)lo*cvbe hserp4; sz;-fx7 s a wire at each end. The scaffold is 18 m long. A 650-N box slw *f cfxvzr obp-en)4xp;se)*;4i4 9lj sh7sits
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 edgg lk/lpi bth 9f7+dw5( j8rpbqe028pne 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 wqeb2r7l(nl8gid jwp p 9t +k/bph f508hat 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.fpqk e62i2lw;i/ mku wzip+qz4q,m1g5wx 7 y(0 m. The board is supported at each e7e(p;piig 6+1x ,uq 524imzwlmwq2w k /kzyq fnd. 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 2.00 m, and a plank of mass -np451 u .nq/,bvz zokvdg7ov4.00 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 reads 50.0 kg. How far from the right scale is the person's center of.uv n7z,/qkd5v v-o41pznbo g 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 whybx(a/ql ; n-a vsjgs*u/. f*qt69vof mass 0.50 kg lands on the wire midway between t/-jbqgwhs q 6 y9s*fl(;/vna v u.txa*he poles, 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 ce ,vuk/ 0 rbp:xfa.8xmds/i;pm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm to hold.vk da/xpfe8 /,r 0psu :i;xbm 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 ))uuelvj6 t d2 sj2: y ch0x.j:xa /oo+mqmqe(an outer wheel base width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. Wh jy):( +l2tcm)6jsdj2:qeua o/.qm hxxvuo e0at 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 5) l:6quayjuirk j) d *yq0b4z*(;cdrh5 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lea0 : j*hycuyqi*az;rr 4 q )bk6dd)ujl(n 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 0.0025 cm. How ma+suw5qu)zgf)si :f, uch force would be needed to compress the block b+a):s g5i fuzu)wsqf, y 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 an(g q40dt,4s +vjy xbhud 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 service station is 4.0 m looy2:zx6al5mb ng and 0.20 m in diameter. Young'bx6:m 2oyl 5zas modulus 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 0.20xw xr6;uv5(p7acyl kvsv/4:a % when a 6.28-N force is applied. What is the elasticy(/va7 pxw;uc r4sklvx6av 5: 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 wire of diameqt oq . 9wvsxqu j6/c+tfszz7 g,tk33/ter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young's modulus fouw vo.gzt jfk 76q3 st3,qx//+9tqczsr 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 his wei8ir)gvpcoiv)j ,ot3/ ca h:yr0z +m-lght on the two crutch tips, each of-l,i/v:3vj ctr i8pc0yr hzo ))g+mao 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 i ks c1/2k; cj(sae+jyohjw3 3area 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 lo p /xbkymxizp)yl.y(*4/.ieength and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Younpy y)(yx/zp l*k4/.bo ixme.i g'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 10.2tmf v7. qwpp30-kg mass. Wha mwppfv7.t3q2t 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 to one face of an aluminum cube with s*7e7 .4c3ux7toyzi kyeb ao 96eltm4j ides of 30 cm. What is the resulting relative displacement? (The shear modulus for ji*c 7a34elo9. 67b tzme7ouy t 4xykealuminum 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 9f yfi-mkb su8g+f b/(nye4p8 -+,zqelbhh c 6m in the sea the pressure has increased by 100 atmospheres (89b iuy+b+sg6 b ffnm -kq /8cy4hl,(-ehezpfto 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 compressivewp m+ *;3auspbz90n qekiz/f1 strength of steel isenp+1zs9q b zi;/uk3mp a*w0f $250 \times 10^6 \; N/m^2$. 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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