Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessar15xfvl zi. k8iy 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 necerln e8tbo4t4o71 xr.mssary 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 net forcec ((aj8jah jexc)5p7v,uj;ev on the book isaj 7 c(e,5 ;eupj xc(aj8vv)hj

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 +qxm hddv:5o36m-ollcity of 9.8 m/s. What net force actqhdox6: v- dll3o5+mm s 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 stands with one fooy51: rz9hbrm ;vy sd47a4 zjuut on each of two bathroom scales. Which statement is definitely s1 7 ;4b9:zhauduz4jyv m 5rrytrue?

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.wd,l we2vf7h .tijf, girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to vf.tli7fwjh2 e ,dw. ,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 abfblje;du: xztig7 ; h-i090(lmp 6i 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 t4qtf7jznf 2d tfp)u*u )-fd n4abletop 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 br.x) wg zcyn;.zh dhb86icks, 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 brick can extend beyond the table edge wiy. gh ;x)cd znwb.z86hthout 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 u nbeb7k0;nr,+o ek;kequal distances apart on the edge. +ebkbre,; nuno7k;0kWhat minimum 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 made of aluminum, brass, copper, and stq l 9daa*fskcnv*aux+lj ..( 3eel. Which wire will stretch the +x* ulafa .ds.9n(qvkc 3*jlaleast?

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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 tayew/6ll uz, /ension of 36 N. If the wire diameter were half as great, we would expect the wire to breue,azy / ll/w6ak 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 butr7. x(ujb6hi5g) s4eu irkax. tressing force at the base of a pointed arch rxsua.6.h(x k7iu5r) ji4gebis

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 35v16 i/ bdemy6lupmp the fulcrum to the weight to be lifted is 1.0 m. If a workp3ule5bd1 6 6/mvim yper pushes on the opposite end 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 distance from the fulcrum to the weight to be efb i* wi6pf1 cgphx4 h,xyaq0:d8,g7lifted is 1.0 m. If a 3000 N rock is to be lifted,bg1 qe7f4h ii8 ,cd6gax *fp0xhwp :y, 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 seesaw.v:,dr+o-/bcx4 pbg+t 3 vdpi x The boy has a mass of 75 kg and the girl's mass isvt+xib+ or d,bpv g4x3-p/cd : 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 oo 2bz fpr5y05fbw b)t3f a uniform seesaw which pivots in the center. Child A has mass 60 kg and sits 2.0 m fromfw5o zft2b5 y0b prb)3 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 supports two children weighing k-hko .s+jrul2a(a y/op4gg/ 500 N and 350 N, respectively. If the support is at the center of the board and the 500 r+2kggp/o y/ kaul.h4a-(jos-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 endspib6)maij s13av9w phd0g n13. If a 400-N person sits at 2.0 m from the left end of the behs3j pwmba01n i1i 96pa )gvd3am, 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 .sqey 79accsej.5qd w67.hlgsupported 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 tenc.9a.lqeyd77j. s swqhe 5cg6sion 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 llsv5(5p b:pdv0 uqs ,5t( cecat each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What i5(cu: pl0 vvs sdcqpb,l5e(5t s 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 y+y+aa-u7w c a2tvy q;up by a wire at each end. The scaffold is 18 m long. A 65+a2 yqw; 7u-a+aycty v0-N 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 tlf*ajh(t0j mqk*k o; 8he 50-cm mark and has masses of 0.40 kg and 0.0kl*jm ao;jhfk *qt(8 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 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 u2onz1 qco uqka28s)+6m zkm4c niform 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 that at the left eaqu zmzk c4co+mo68)qkn22 s1nd, 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 pla2-r8wm4 od,lh hz m-tfnk of mass 4.00 kg is placed between them. Each scale is observed to read 2.00 kg. A person now lies on the plank, after which the -ho2 md4w,tmflhz8r-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 +4w:vjl1 ipvy separated by 40 m and connected by a wire. A bird of mass 0.50 kg lands on the wire w4p +i1vv:ljy midway between the 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 3ms(5fwj x;0r dm vgg*za y:*dits CG is 12 cm from the elbow-joint pivot, how much force must the evygdwj;a ( 53sg mr d0z*xfm:*xtensor 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 basepwzv cyt:pp7;z.xp/- udf7;p width of 2.00 m. Its center of gravity is equidistant from the sides, and positioned 1.20 m above the ground. What 77p/;z :.fu-pc pppx;zvtd w yis 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 55v7 33npg n bgk0kpx2 umykh224 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean befo 2 4kg0 33huxbk7ypp22gnk vmnre 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 ws0gz- q/af 3dy8uph ax(ml; s6(ta5wuould be needed to co(m 8s -0 /q;p6dfh3w5a (usxaat lzgyumpress 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 has3u:axt)b 8 cwe 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.jwih:lv 0, qq+0 m long and 0.20 m in diameter. Young's modulus for steel :,0+ l hwjqqviis $20 \times 10^{10} \; N/m^2$. 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% wnxu jve8 bau). u(tg+-hen a 6.28-N force is applied. What is the elaseuv8u+) u.bn(x a- gjttic 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 diameter 1.0 mm and length v8:u9fq+xbou2h l-re 11.2 m. How much will the wire stru fqx:e8rb+2ovh u-9letch? 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 w1:zncb) ah1zshsqea a 27 kon-k,z5 d:alking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What pressure is:zzhs5od1naz c -:k1 qahsb 7)a,2nek 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 arwj 8x g(r02pq86u0q;ocnj i awea 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 diameter support 468 en*s6cxl-vuituc;ac1: vk del a*s a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum isll* 6xe6a4k8ue: 1vcti ac cs- uvn;d* $7.0 \times 10^{10} \; N/m^2$)

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 andf17cvzjl3p+jj7 z; jy fom/m1 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation ofjfzlo1vj j/+m pfmz;317yjc7 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 ou4y.or,;vq dta2vqn9q4v+ zr xtq,w5f an aluminum cube with sides of 30 cm. What is the resuq,rut 9 wvvno q4y.r x2;,t+5avzqqd4lting 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 increa 4eui-z.5gkkfjbj3k2p8 e ak0sed by 100 atmospheres (jpk ub4308 fj2ek aez5ik-.gk 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 strengx +ha mab956ch*vp +iath of steel is x p +a+9chi5 a6avmh*b$250 \times 10^6 \; N/m^2$. 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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