Physics Unit9: Static Equilibrium, Elasticity and Fracture

1#

What condition or conditions are necessary for rota)a3zh p6r up,ptional 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 stati :,tk8l8ra9zfih q js:c 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 forcet+ 3qwruc6 sipp.5za djz17h ) on the book a7q3jd w1+p .) 6 p5stzcuihrzis

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 constlpvh1 b38h a-jcm6 3dbant velocity of 9.8 m/s. What net force ahl3mbjp a1d 3-8vc6b hcts 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 foot on each of two bathroom scal z55geoh44.k whx4f wges. Which statement is definitely truew5ewhhf .44 x4gkzgo5?

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 masl)r zbh x63ne -ia2) zcx+jpi-0xm/ sssless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen t)i-) 23lh6xa s+x/s0 n-zxzj icpbermo 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 smallui6 bvsf t1fe96 mqw75 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 t*ftmv) nb2y *gabletop 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.hn4u 47ki(up ldsbx l b/v)c3 /w-,pld0 cm x 10.0 cm x 6.0 cm. One is stacked on the other, and th/( u3 s4 kb-)d/7hw xnpvdl4 cpiblu,le 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 lerafl lfy4-96 pgs placed equal distances apart on the edge. What minimum mass, placed in the middle between two supports on the table's edge, will cause th4l p6-rl 9yfafe 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 dqwfqfz5: 0g4 wires made of aluminum, brass, copper, and steel. Which wire will stretch the least :gfq5zf d40wq?

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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 founzalt;5 2q(gjdl4 *w rid to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subldr42wqat * i;zglj 5(jected 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 the base of a pointe ;c,a(:sk7u hfr2opscd arch isc o72,srp(:uhaf ;sc k

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 weig7vy pd2 fhx)pwqxk /2-ht 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 bx2k7) wydp- fvp/q h2xe 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 liftl, fx*,pflz eto429um ed is 1.0 m. If a 3000 N rock is to be lifted, how muchlmf 9pzt,exof* ,4ul 2 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. The boy has afo ibjz+f r.4+ zqs02y mass of 75 kg and the girl's mass is 50 kg. If the boy sits 2.0 m from the pivot point onqfzifjbr.z +s204o+ y 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 which pivots in ix:-h8.rec jl 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 child B sit for the seei8c - jrl.hx:esaw 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 weightq x95)btrsrx7 40 N supports two children weighing 500 N and 350 N, respxs) 9r x5rbt7qectively. If the support is at the center of the board and 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 suppoc,hljknlk z:h ) ;6tq6rted by two ropes at the ends. If a 400-N person sits at 2.0 m from the left end of thhl,l)h:qz6kc tn k j6;e 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 supported by two ropes at ehv 2o1ovsxgn 5 :x*yk e(+y;athe ends. If a 400-N person sits at 2.0 m from the left end of the soo2ykh+e ;(ax *x veg1ny5v :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 a3i uwqpu 7:/omt each end. The scaffold is 12 m long. A 300-N box sits 4.0 m from the left end. What is the tension in e:w 3p umou7/iqach 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 i-ll2iuo 0nxcawk: ;g7 s 18 m long. A ca27wul:ig0;ln - kxo650-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 q9atn7zwn hhp25l ad39,ch)o 1a4 h zda knife edge 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 (at7,qwalz95d h 1pa43n 2nhz )9hoahcdt 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 mx8a,c0miu8( v3 lboaN 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 end, howom 0aauv838,l(bmic x 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 mavm-*sv d,bo/j ss 4.00 kg is placed between them. Each scm* jdsv, -/ovbale 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 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 co+l0j gmax-voold1v. .nnected by a wire. A bird of mass 0.50 kg lands on the dglxl -mv1j. a0.o +vowire 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 hastpnk5*u/z.b k a mass of 2.8 kg and its CG is 12 cm from the elbow-joint pivot, how mut .zkn/bpu 5k*ch 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. Its center of grav6szl6lq 8eumr ae7. (xl x4xh,ity is equidistant from the sides, and positioned 1.20 m above the ground. What is the maximum sideways angle at which itxz.,6qxxhe8 4 su6 rlllm a7e( 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 diamfz y:6kt,pc b3oqtz4s3qac9)5 n r c+heter. The top is 4.5 m off center. How much farther can it lean before ibhc o)k rz5 43:qy6cca9zq +3tpsntf ,t 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 r1+ w+ft6+irxkve.f q cm. How much force would be needed to comprxw ef+tr6+qf 1kir.+v ess 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 has a cross-sectional ad fr1w vk2z48srea 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 long and 0.20 m in diam3l sts.z45wjoa 6g3pmeter. Young's modull3s 3mgw54z oasp6. tjus 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 pd61bew va r0( ohx8zuy1n(9i stretches by 0.20% when a 6.28-N force is applied. Wha6u1p9(i(by vd z1r xwahe08ont is the elastic 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 diamtvv )eu7o - ,j42vredteter 1.0 mm and length 11.2 m. How much will the wire stretch? The Young'4 tv7udve ,)ev j-tor2s 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 wal* zy10i a.biijmnu+9 uking on crutches supports all his weight on the two crutch tips, each of which is circular with a diameter of 4.0 cm. What presbu9un* az. ymj+i i1i0sure 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 ar7y0 yrxmh7 g)9 xds:ckea 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 intg7gqz(sh*ki9w* wd 8 length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire? (The Young's modulus for aluminum is*s kw(7gwziq*hg9td8 $7.0 \times 10^{10} \; N/m^2$)

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)d r*+tq-n3i2 aw- k;kn+vjbztwo )po in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wj)vkwbrp- )oz+32nttq -da+oin *;wkire? (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 400g*j8 k,,)oa( y3 esun mifxydg1 ;j1wg N is applied to one face of an aluminum cube with sides of 30 cm. Wha 3nmxyds1k ju j 1*a(wgoie,)f,y;gg8t 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 in the sea thx /zh c589qwectkn cw6ui ya((11 fm1fe pressure has increased by 100 atmospherechwui5(8 /(xck1 16t1wqza 9nf f ycmes (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 ha2yud/ zvk2 vxd5 om3nk8v* )sgs a diameter of 30 cm. The compressive strength of steel isk *oksxdg 2853)m y/uvvzn2d v $250 \times 10^6 \; N/m^2$. 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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