Physics Unit9: Static Equilibrium, Elasticity and Fracture - 无忧得胜-网上国际课程 (5edu.win)

1#

What condition or conditiok. rw 9fusqwb)uv 6h/)ns 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 sta2x+5ue x; sgpjtic 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 o)5fa4o d6td i 6vmvo;force on the book oto;vd)i 56vo4md af6is

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 vzb+,- i(aw nrv;/ksptelocity of 9.8 m/s. What net force acts v;n+z tpkr-/w(,bi ason 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 lq*.9mblf1sxiv:oif d5f txvda2g8+7g;qc/ with one foot on each of two bathroom scales. Which statement is definitely tru/t;fofs:q.g8dcxi 7a9gf l5vqb1m +li2vdx * e?

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 they bothna3xd )kk,-cg jp(/ kd move forward so that they are one-half their original distance from the pivot point, what w)da3p kk/ck,gj(d x n-ill 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 itwr 3pgo8f gi:/ma 1 mff+gf8o6s 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 horizontl8dmh6 iy j)p7lwj2 +fal 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 identical bricks, each of dimensions 20.0 cm x 10.0 cm x h4 *4wcbf*u ;; iwcdl2t1qaiq8w+yij6.0 cm. One is stacked on the other, and the combinatiodwqib a;uyi 4; wt+1 cwhf2j* ic*8q4ln 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 xw meb d:4nj( ewffn5e30ir9 ,placed equal distances apart on the edge. What minimum mass, placed in the middle betweefmex ew ,wn3 9b(:5indrej4 f0n 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 ideje8l)s5h1ks1by si/ t0p 7xc jntical wires made of aluminum, brass, copper, and steel. Whic01cj) t1 /lj7 kp5ssiyx 8bhesh 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 minimum twe8pf;2a8n.rd sd-+g9tw,b d l zx rk,ension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjr9dp;+2 g, . 8edrtsz ,kwd8x-bwfalnected 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 oaar835r hb; yqf the buttressing force at the base of a pointed arch br5aya8rh;q3 is

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. Ts to,h e us)8 t 59;etgv 86if9lvslblm+5tlw-he distance from the fulcrum to the weight to be lifted is 1.0 m. If a worker pushes on the opposite end with 400 N, what is the maximum weight that can be liftew88l +-t f h,i mt b95t;lvu vgos9et6)s5elsld?

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 f/xc*.pi r.jb6 c4ubokrom 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 ./bcrkocu4*. 6bpxji 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 seesaw. The a5ioyh9bq w*p* qjj9 vwf.96v 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 the seesaw, where must the girl sit on the other s9 q9f*wavj5h.6pyi*q b wvj o9ide?

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 6y/f0;arehv(wiof h ) seesaw 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 center must cffy wa/ 6)vrh0(;oei hhild 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 supportsbcmelm y3 4o()w9x.ar two children weighing 500 N and 350 N, respectively. If the support is at the center of the board a r.mmxeoba93 l)4yw(cnd 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 :zm6p2pi9 p o d)4gfa3mdk1ql by two ropes at the ends. If a 400-N person sits at 2.0 m from the left en m op2d zlmp9 kd:6q134aigp)fd 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 supi 2kca4atg6q 6xx:q dvh ia5)48wiv fhvn+ +k-ported by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of the beam, whax k)vh46i 24h aadnv-5qcwv8 t6+aiig q+fxk:t 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 ea7;u 7l:robi)swruw(q tk4p)a ch end. The scaffold is 12 m long. A 300-N boro)wwsq(7 4p tuu;lkarb )i7:x sits 4.0 m 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 iz(a1zk.94e 2 / twgnr ws8zbpby a wire at each end. The scaffold is 18 m long. A 650-N box w 29t(werz1zkap.zs8 i/n4gbsits
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 th5f(p uclf(dl2oh 1e h *o1x2qse 50-cm mark and has masses of 0.40 kg and 0.60 kg hanging at the 20-cm and 80clhds(qx*(po22f l ho f e115u-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 lengmqw7qwt 3+ymb; .f 3yat0ac;yth 8.0 m. The board is supported at each end. yy3 bm; 0qw+at7a .m3w ycftq;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 4.00 kg is plac;zo a9)1koiajl7wq6z k5zn.ced between them. Each scale is observed to read 2.00 kg.qo 5zaw7)k;6 jzo l9nacz.k i1 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 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 ogdxxr9: ) sse2 xp 7.,a:gbfxdf mass 0.50 kg lands on the wire midway between the poles, causingsgs :: a.xpx,xfedb92) g xd7r 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 vrda2i a)hb *2s6f-rppb0k j vdi+w2 7and its CG is 12 cm from the elbow-joint pivot, how much force must the extensor muscle in the upper p)ia f6-r bvd*ahw 2kri 22b7 +d0jpsvarm 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 w9l7l kfeje8 25kra4 sdidth of 2.00 m. Its center of gravity is equidistant from the s 7k9 sl8erlf 2k54edjaides, 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 ts wxdc)p7t vi0cx ,;wag20l d6all and about 7.0 m in diameter. The top is 4.5 m off centw a xg 27)s;txlw 6d0p,0ccidver. 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 0.0025 cm. How much force mqah*pbr6)iqnb7 o1l.e/6zb would be nei7 /16a.)qo z qbp l*6mnebrhbeded 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 anqo)tu ie eg2v,o gy*7(d 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 t)+ y2yh u oey7rt tpeo/,x8;vm long and 0.20 m in diameter. Young'sveh;tytuo), t8yeo/+y xrp7 2 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 0.20% when a 6.28-N force is 2)i+euswi1op applied. What is the elastic modulus of th)+esp i1woi2ue 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 3c 9ea2xr:1 nmp-n nlgmm and length 11.2 m. How much will the wi1cg93ea-l 2rxnnm np :re 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 supports all zhgsf00 c * teoug6gy)f,b7i1 his weight on the two crcff )s1bz0o* gy7ui6g ,het0gutch 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 an area)o8b7: f ,nockhnc3oj 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 . 1g:ftpd+ehf+sc/bfdiameter supports a 10.0-kg mass. What is the stress indpegs h.: +f+1tbffc/ 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 supporke7uby *)lnsos. +2oauyf-6vts a 10.0-kg mass. Whsvsyyk)2.76-obuuno+l e fa* at 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 ofm,6 nr lo 98qp9nrz+jv,aozj: an aluminum cube with sides of 30 cm. What is the remrzjajnl pz ,8,: +6qo9r 9ovnsulting 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.;dcst9tle1wft q m8 7 increased by 100 atmosphe.tfd e8 tmtc9qw;1s7lres (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 compressivep(q5 +n ;k3c1rj)e)bngsw 4p6cye goy strength of steel is )q oes y)c34bpw1 pn6g5nc+yr (;ej kg$250 \times 10^6 \; N/m^2$. 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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