Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditio)s5jg 0o2. 9iy hanqy: q(nohzns 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 necessary for static e(+q 7fgz:*hgar,k fhlybg+0v/ uul -rquilibrium?

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 n3kgds x(ze7,v b eeq06et force on the book 603 qee b(xsv7,kg dezis

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 velo- :;lijfipp p1vo2epc5 8 q;hacity of 9.8 m/s. What net force a:2plh5 q1p; ipj pvi-; ec8ofacts 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 +tq jpwbm**b8:vc0qvstands with one foot on each of two bathroom scales. Which b*v*t w:qmb q8jc0pv+ statement 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 on a massless seesaw. If theyrlm +,1h;2o twz+helv j3lky. both move forward so that they are one-half their original distance from tlhlw2ye+h,l.v3om j ; zk1tr+he 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 4,+-ib) x6ffz/y:elrk tfgyg hb:o j(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 ta1*em kbquap,vky4.;r 5;m i xrbletop 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 identicalll l1o7xa p6-c 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 distance that the end of the top ba c1 6lllxo-7prick 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 le ,nj)hdoo7/ vkro ;u.bgs placed equal distances apart on the edge. What minimum mass, placed in the middle ;7rono jbo,d/v ).k uhbetween 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 ident g:wqw/l+l2 : +wjnestcts(+iical wires made of aluminum, brass, copper, and steel. Whic(2 l+l/wnq+wst i:cs:tw jeg+h wire 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 zbw)5/9)qzrb/vkgeu +k-yb dminimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when s)qz vdbuw //e 5 r)-9b+ykzbgkubjected 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 compo7pp5c0)xytq e b(xca3. gdk9 mnent of the buttressing force at the base of a pointed arch isxxpa7(5c ykq)mb9p. 3g 0edtc

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 be lift(quzcgh-v5um cye1 ;n64k d5med is 1.0 m. If a worker pushes on the opposite end with 400 N, whamg(dm6;h 55qucn4yze c -1vkut 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 frbu3;0k zs bde-0wzy63z6lunsom the fulcrum to the weight to be lifted is 1.0 m. If a 3000 N rock is to be lifted, how much forc3z-b0lswk 06zdz6 3ebnyu u s;e 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 massq ngh9ah w4h8:al-ct)kc ;9m wless seesaw. The boy has a mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point on one side of thacqwcwlhk gma4-;t8n9 h:)h9 e 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 which pivots in s56zev -fwg.qthe center. Child A has mass 60 kg and sits 2.0 m .qvg 6ezs-w5f 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 supp 8v+q,5gn: sku3r mgvzorts two children weighing 500 N and 350 N, respectively. If the support is at the center of the board and the 500-N 3vgv ,r5+ uk:qs8mn gzchild 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 a:vn5-ye7 m n krh*8rjrt the ends. If a 400-N person sits at 2.0 m from the left end of thev -r y7n8k*me5n:rj hr 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 suppohig gc746(t )-stec4e6srnv9kz* vi nrted 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 tensio cehksi4r-n 9)ve6* (gnt sivg 7zt4c6n 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 scaffola jl..w7e /dggd is 12 m long. A 300-N box sits 4.0 m frowag d.l.7g/j em 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 eas7 d 0+bcp-btych end. The scaffold is 18 m long. A 650-Nsy pbd+tb0-7c 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 knife edge at the 50-cm mark a2)k5 v) 1awgofencs) )wdnj v9nd has masses of 0.40 kg and 0.60 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 en v2ow)nsv)k) f9dc )jag1w5 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 )ltiy5yh.:eahrf q+(a uniform board of weight 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 tha+ ) y(fi :tryh.ehl5qat 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 4.00 kg is placed bet9jo adr57 ,izeween them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the right scale reads 30i,o5ja9er7 zd.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 blk rn9.+zr(vlby(x a3 y 40 m and 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 9 .+alblk( rxy3(nv rztension 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 a k:wcx99.qrz5sq3ze rnd its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper arm exert on the lower arm tc:w99k5z zqr3e.rsq xo 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. Itsn/ rlbtxz (1q i2xv03h center of gravity is equidistant from the sides, and positioned 1.2nl12vq( it x hbx3/r0z0 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 Pir, vmd-5d,lypcvf 65isa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much fartherdv,lr- ,di y5cfv6 5mp 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 stee c3/ke cxq3 xocckr,4.tbq 4xloo y+0;l block by 0.0025 cm. How much force would be needed to compress the block by 0.0125xtxoc ,4x; 33qyb kokler/c4c 0. ocq+ 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 longh 8rw ;3p(otfw 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 s;kup5qgse./b0b c /xzervice station is 4.0 m long and 0.20 m in diameter. Young's modulus .bgkeq/;pc /u50x zs bfor 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% when7eh/o, h:akq isc6mq9 a 6.28-N force is applied. What is the elastic modulus of the9 7sh qm:6o,e qi/akch 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 leng2tarya zs1c0 i*6vx gw-htk75 th 11.2 m. How much will the wire stretch? Twy*- 52g7it1sv 0hc6kr axaz 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 supports all his weight on the y u7bnnx j 6x(3(fdc.,(xpgpj two crutch tips, each of which is circular with a diameter of 4.0 cm. Wh3(6( njcn.x, (p xxbf7updgyjat 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 aq-3u4dp4*yzpieffw s1 tjr5s+; ,4vp/ao xjerea 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 10 ;iyx7yx xzwm in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulx1 wyyzi7 x0;xus 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 ( qtvlaag4: ,zlength and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire? (The Yqg4 laz:,v a(toung'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 cub8:iy ufb3;l fxe with sides of 30 cm. What is the resulting relative diflb u8i :;yxf3splacement? (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 pressu+ d9ntbn t/wr4re has increased by 100 atmosphed4 n9/ntwr +btres (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. h*(x2 v3mqye * .s1rxgj1tay rThe compressive strength of steel is qx(j3a yr. ey*1*grs vh tm2x1$250 \times 10^6 \; N/m^2$. 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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