Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for r6cehi )/0bqbz v- zkxjc/rj60otational 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 conditionsf5y6qt v)e uf9dqsx49 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 cxhx :.3mk1 xr2 lqnl4above your head the net force on the book k1 lm32. xrqnx 4lxh: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 c.t.(sqyqr-6o o1lq u fonstant velocity of 9.8 m/s. What net force acts on fuo.l16qto. s-yqq(r 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 fooe 6:a*.wpp/:flri:j.ob g :a0riftv zt on each of two bathroom scales. Which statement iwf * .jlpi:gz0 v6f:p:et:r . aba/rios 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 a61lnpz ;rk j 3. mvx(1elq3vyon a massless seesaw. If they both move forward so thatnvq(.3 m6 3al1pyl ;vkzx1jer 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 isr h41t7/u7uayw tsqwfgn l:45 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 gss1bj ug5p(jf2i)3t4n 6et bhorizontal 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 identicaqs3vyrlr 5k0ms-lipr5i:0f y5 )b(bm l bricks, each of dimensions 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 distap sl5is k l(iqb) vmy5r-:fy5m0 3rrb0nce 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 distances ad4r 7(q9edj(2 ; )jnjcgswpvgpart on the edge. What minimum mass wjd29c(4spjv; (7 jn)g qegrd, 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 wi7l.wi 0bxctd /, wccu3res made of aluminum, brass, copper, and steel. Which wire will st/,3 ticcw0ubcwx.l7 dretch 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 okzi 4z+7cxt6 8ytjr: vbd8mp +a/0ebv f 36 N. If t4ri8c0+ bdzvx8p7t6tebv ka: y mz/+jhe wire diameter 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 buttressing force at tglhr7;dau g*/p6 b2g nac64dr he base of a pointed arch isa6 74d/hdc6 rgg;2brnpu*agl

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 weijaj 42pbd(f5n:b ; qfonsao2-ght to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what i4qfob-5 2saj j2 dn( o;pab:fns 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 caigl (* 7lxc gr(xonnqkt59ttk-jt,5/p1e-the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, howrtni9x5* (ettk ggn/ ac,kpj (5cl qox1l7--t 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 bala1:sly)d f;t( nnhrpt, m9 wqq2nced on a massless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits :2nhrny fqw;s d,(pm 9)1tqlt2.0 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 hb3q0y7gdoh5a q;pg; opposite ends of a uniform seesaw which pivots in the center. Child A has mass 607a;y gg pd5;bhq h3oq0 kg and sits 2.0 m from the center. 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 supportjt1hx7n*g5 v vs two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N child iv7nvxt hg 5*j1s 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 suppvynfjh4inv*; ;z a ra2q28h-aorted by two ropes 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 the left r jhazivh a24 fq28n;r-*y;anvope?

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 twog66 k1znnutazd +x; b ckny106 ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, what is y; dnznkxbgzn1ta1 6c+60 k6uthe 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 wirct unat52scmjc1 t/* *e at each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from tu t/masj2 *cnt51* ccthe 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 18 m long..ujr9408*t lqfqg x ko A 650-N box sit9j. qg8fko4q* ulx0rts
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 c nvj1afb ;a)/j rk9m)has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80-cm marks, respectam /fkj;c1)ab )j9 vrnively. 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 8.0 x3*+8w :euhml-oba y ccbe70em. The board is supported at each end. If the support force at the right end is three times that at 7aw:c b-*0ho8m yxu eel be3c+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 4.00 kg7 idlx(e ,.0ux;ltaw wgl/k(t r(h5ng is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after whichtltr ;x5((d(n.huleiw 0w /agx7g, lk 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 wig ug ec.1hhs zxpn70mm) +h.b5re. A bird of mass 0.50 kg lands on the wire midway between the poles, causing tg .us.m h5nxmg bhe1+chzp0)7 he 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 np3qzy(-eqq**6 zi zg(mfw+c of 2.8 kg and its CG is 12 cm from the elbow-joint p+zz3i6qpcf wy- g z*q e(n*m(qivot, 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. 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 2.00 m. -htdn6qu0b8. t )frzz Its center of gravity is equidistant from thnt.d tfqzh-60 zub8r)e 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 top is ;j6z, jtzsl2/fsj7 re4.5 m off center. How much farther can it lean bz 2 f7srte, ljjzj6;/sefore 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 much force would bet 36c.t cjswf* needed to compress the 3. 6js*t fctcwblock 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 )s t-zx5r9hij6bhcikc 0 e3;mof 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 lbsc0/ t2yl9 bmy1jwv (92k nmzong and 0.20 m in diameter. Young's 1 9bnwtk 2ym/(jm9 yv0b2 zcslmodulus 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 force is appl5k ,nb eco(8hlied. What is the elastic modulus of cl(,ek5 8 hnobthe 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 dv2i(+a kkjzu7iameter 1.0 mm and length 11.2 m. How makuv (kji7 z+2uch will the wire stretch? 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 skij );rxda829t k +rhxupports all his weight on the two cr8dxx2 t;+kh)r i ark9jutch 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 a+iq)sdiwvn1q .(xk v6n area 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 diamc/: rl8+6km8rbzb ofv+did g 6eter supports a 10.0-kg mass. What is the stress in the wire? (The Young's mor:brv/ogl+ km c+6i8zd bfd86dulus 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 iui3fxw scwt2 c58wze* r18 )wsupports a 10.0-kg mass. What is the elongation of the wire? (The Young's modulus for an c5zc*1f8 wru2s8twi)w iw xe 3aluminum 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;f d-:k hv*gr*.kodex face of an aluminum cube with sides of 30 cm. * -dexdvf .;hr:kk*og 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 i* km2u s3ejl hu .er+))1,p.dsxytkimn the sea the pressure has increased by 100 atmospheres (to ab3ly*1ku. e ehup)s kjxtsi+mm) dr,2.out $10^7 \; N/m^2$). 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 dia t.)(yobhf4pc meter of 30 cm. The compressive strength of steel is pc.f )(y4obth$250 \times 10^6 \; N/m^2$. 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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