Physics Unit7: Linear Momentum - 题库网 (tiku.one)

1#

What is the SI unit of mo(t):uo7 hjk3q icz iw:mentum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannon;z3vfwly,5*sf-a* x w jy1fmm ball, the cannon will recoil backward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves zg6;rs16 hcca along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What hchz1 rgasc;66 appens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on frictionless ice. What hgg3m9 a r6+ enxsfc6s7appen+rs6ag3gef6mc 97 xsn s to the velocity of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty h9z- 2qggfrbpv ajjwgq(y7 5ou7psj;cr+ o;)5ave equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences th95p b-zg2g;;aq(yp o +r7 7wrsfcg vqjj5 juo)e greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. How woull ev8 q13asaa7d you represent its kinetic energy in terms of these twoe1a a 7ls8v3qa quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic enevpjovku2+6 r bs0e122x fs*kkrgy you gave it in the previous pitch, the magnitude *x6bj p2 o2s vrkk+v 12skeu0fof its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law inuur yyg:)0t8o terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservatiotfkrg,7*e,j1stf)yzum *j r4 n of momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs.us+vfn/*nw9 h t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following w*:*)nd cuut du1tcae:zd1 l (b5whwn7*h4fg is an accurate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes witsy8eql 9 5un/uh a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is qu5 sy /98enlucorrect?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

C. The small car and the truck experience the same average force.

D. It is impossible to tell since the masses and velocities are not given.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one r28zkq:b +7 grxpyz+ta ed and the other blue) are dropped from the same height, and rebound off the floor.ak87 bx+ y:trqzgzp2+ The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

A. It's impossible to tell since the time intervals and forces are unknown.

B. Both balls were subjected to the same magnitude impulse.

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, collides with gru45b0g 5ylgjdr 5jx:ll v.3 a stationary bowling ball. Ty vlj4gjgr0 gx:5r55 du3ll .bhe Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

D. It's impossible to tell since the velocities after the collision are unknown.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce ofoh*u q 719vkfef each other. Linear momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collidpqd,: 9 91qkr *frvehses head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct,9rv he 19s:kqd*pfr q?

A. The total momentum both before and after the collision is 24 kgm/s.

B. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

C. The total momentum both before and after the collision is zero.

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg h:81zx x2i6, /1mqrkom uhgvbk alfback run8k : 1qxrmvm1z2 k6,iuxbho g/ning
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

D. this is a simple example of an elastic collision.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the moment3)yn:4qu wh ryum is conserved, then which of the following statements is true about ki q3)4yhryw:un netic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conserjhes2 . ;3ptr ilv8c(fxr*b2p. he kf,./wubwved?

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #5 ba0 rx zxhtcp909ll and stops, while the #5 ball moves away with the same velocity as the cuhx0z9 tx0p 9cre ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

D. any of the above, depending on the mass of the balls.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 m/s collides with a heavy o/ xzvcx7g/d d mcg:bz28 9vkm 1vtp.5exercise ball at rest, the beach.xg5/k :c 9zod1 m8/vpv gd72bc xvmtz ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in a head-on collision wr)vs18gpw4d 91ovld*kg 42 x pv waqt8ith a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball vw4t k1 8xs 1l*apgd8owvvp4gd)r2q9immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on 0zlw:7tpm vdl)o5hh3cw 0:c melastically with an identical ball at rest. What is the speed of the initially stopzc:)p: wlt m hch 3o0wdlv570mped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object mojr q8f)cf7g f9/gs:hqving with speed v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the sp qq 7f gj9):hgsc8rff/eed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v collides head-on with a very heuzck ,,z)lbns nnt--9l/:8 vl8c la zqavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the clvc,k t8bz a/lsz-z)98nnnclu,lq:-ollision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s c ,f2imw9 8pzu1kevx6 lollides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow,6 ex1pwz m f9i8lkvu2 ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides headx h uks4tyku.0 :im1.t-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is4 ux 1.:tkhmy.k0situ the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is codc, okg /1rthzm 9v(/znserved, then which of the following statctzrg 1zd//h o k,9mv(ements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick togjbdsz0a+2-(xw vw k76h ,vfjjether. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a per frvr(ciyw3;3 d kh12kfectly inelast(cy3 hk d;fr2r3k 1wviic collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and stp4ta/ir s5i8g9taq: oicks. Which object experiences the larger magnitu q gsoa85a4/tir: itp9de of momentum change?

A. the large object

B. the small object

C. Both objects experience the same magnitude of momentum change.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and is deflecd pa tk h7h-ndye29:.jted at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and -xhi,f *i:h knm. Which of the following statements is false?i,x-n: fhi*hk

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a falsi4dp 1y., vvnle statement?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk with a long flexibl (qk eq/4-u fvz(9v *dx2nohkfe rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally, releases a bomb, which explodes before hipq0 ihfa6u3y 9omi(5d ;ucwe,tting the ground. Neglecting air resistance, the center of mass of the bomb fragmemiqhu(p; yiwa9c53f ud,o6e0 nts, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-free road. lmcy8s )ge5pg820eeqThe collision was completely inelas gp2 ce5eq8sl yge0)m8tic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

C. It was not zero, but ended up zero.

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law fo.-pm rolia;x. r a system of particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck traveling at 35 m/s?qj-rzqtydpv4 9 +i c85

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. What is the magnitudsst6t 34rb0 3w-n jzgo 8( teo;bduc)oe of its momen83ct bo jb0wos )e(-4z tungdrt6s3 ;otum?

A. $1.7 \times 10^{-3} \; kg \cdot m/s$

B. $6.0 \times 10^{2} \; kg \cdot m/s$

C. $2.4 \times 10^{3} \; kg \cdot m/s$

D. $2.4 \times 10^{4} \; kg \cdot m/s$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 0.10 kg is dropped from a height of 12 m. j73gy bnhqa( .aze4)iIts momentum when it strikes ghjyba)n. ai4(7 3z eqthe ground is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to wkgkj ,fp-;f4each other. One moves with a speed of 2g ; 4-fpf,kkwj5 m/s due north and the other moves at 15 m/s due east. What is the total momentum of the system?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikes a wall y4az6i cv1bw k 1 0ifkw,a-qy8vnj/+ mand rebounds at 24 m/s. What is the change in the momentum n0mivaf1/ y y4 qcbiz+a-6k1jw8 w,vk of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially mov g. hpfgl*c29mi52x(b dfqc1 iohi, +xing at a speed of 12 m/s, is struck by a racket causing it to rebound in the oppgmi,*cd5h.g2 ihlqf2(fxi+ p 1 o9bx cosite direction at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is placed on gljq;+ t fdz+4a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Ass;dlt fgq4zj+ +ume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking ej v7wdq2 5q:zoutside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg spacw:zejvdq q725 e hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 7 fat; l7yc(wa6d/ d2 rdjtj;o5.0 kgm/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum changet2d ; w7ld6 c; a7j(fr/ydjato?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at9b2 axf (rw)2:jze h2w3j ujac.s-veu 4.0 m/s to greet your friend (40-kg mass), who is stanjcr:2j 2hzwx.a )9 u(v3u-bjfweaes2 ding still, with open arms. As you collide, while holding each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the right aln3mxr 5l f,l*iong a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is th3rxmi5n *l ,lfe total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveli;njijh9*a 2yvn it:5b vy-d4 lng at 25 m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of 9 5 itjy4b l2a;:ndy-vijvhn* the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight c;8ra7ku37be dke kv v+ar, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg 3v +rk77k8ak ;ebduve second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction on a horiz*)w * tijl8qzdre 9an,ontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the cr a*zd9,wn i8et* qlj)ar. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate ofekpgy)2zf m/ npyjw(.8g6x;f2 3cvqi 0.80 m/s (with respect to the log). With what speed does the log mjp i)zc/3y6 w8nfe(2vpgf2 xkymgq .;ove, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on anciri77(k) p/z,r -n hzva j+fb7pj89 ejk ldh1 object. The force suddenly increases to 15 N and acts for one more second. What impuef 9z78)j/d rbkka,ch1 n-iv7rzjhli 7p jp+(lse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6.0-kg object. Whaie 8n.v,gf)h ot is the object's change on o8v g.ie)fh,f velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to theo1b sj0+ 1 .9+xxsbfkch;bfn (fo j,hk right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on the wak9h1nj0j;fb.xbsfc 1bk++ f sx ,oo(h ll?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to./gzz0 pwd+gm you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is them zgz./ +dwg0p magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table tox2f91bssj n7jp. The speeds of the ball right before and right after hitj sfs19bx2n7 jting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 0i7d:q,;j so war40rfopl ig0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds p a0gj, rop:0;wo lif4rsid07qer minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building in o*fdzzs xs4c+.nup(owes, l+ ,rder to knock the door down. This requires a force of 1000 N. If the hose delivers w++. esoxpfn,4 zczdl s s,*u(40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe ayx hm5vt hl ;,iegra0*n5 8q*st the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force diq yg5n;** 5l8 ermhh,0atvxsoes it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/s after 3.0 s, when 9smd:b6q xk;sfired straight up. What average thrust forc6sq9 k sdm;x:be does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at res+ob4b btrd ,l5t in outer space. They push each other apart. What is their separation after the l 54bb+ dol,btrighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a spem c17/thi )v qddpz8d9q o.4fted of 2.0 m/s. It collides in a perfectly ela8 d.ddh/ztpqft co7 i)m q4v91stic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/656b t,fqhhz zb(t 1fjs in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collision? tjzt q1bz h6,hf(bf65

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 9q+ec)v(nyjs 300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right after the senj9 c+yvq )(collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an alpha-particle (which co3 ox -(-g1/iivw9y u63z7bzvyr y cvnsnsists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed w7nv3vzy9 6oisz-i vyrgub 3c1( wyx/-ill the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary ball of mass 1(3nhtq/ l4on 7ozb(vx+am1k t00 g. The collision is elastic. What is the speed of each ball im znq(/x(vhm+ 43 lknt7taobo 1mediately after the collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.70 m/s cd .axd1cjs+/dr+8dti -imi xp/b;bl 0ollides head-on with a 200 g ball sitting at rest. The collision is perfectly elastic rdxb+1ilisb/ d m .ap;tji 8/+-xdd0c.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves withd19fuk syus;n, r,u-(cq bme: 0yi l+f a speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perf +fiu0: bcm lyu9r(s-eq,ud yk1f,; snectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the eaev;pcydoc-5 ua (lgyxg v + 4m)-dxi22st at a speed of 4.0 m/s collides head-on in a perfectly inelastic collislcypgv- mv-5o+u yexd ;ig2(2x)dac 4ion with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a pcdxe)/kz*e;4pw wiz-b1e- l warked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelaz xl*-wick we wp)zd/e1; eb4-stic collision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m :6b5(e2:qjiazgz r6jg6 vkrag,7 mgv/s in a vertical direction buries itself in a 2.4-kg block of wood a rest dzjgvg 7 bv(:ge6rj2,i6:z 5k mr aa6qgirectly above it. As a result, the bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collik(3 y)gx s yz1wjbmru.h,s;k6des with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1w3 z6bjm1(uyhsg yk.) r xk,;s.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.f5h hst6u0 la-nv2i1s 0 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision-fish t1v ushl62na0 5. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

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A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Object A moves east 4nong 1 eqi(nbed o)70with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic c0oeo 1g(d)7in 4ne nqbollision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a velocity of mjvc:gy sju-l qng92k 8w-j; 54.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fr j umjgyl c2wqkvnsj:59- -;g8agment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass 89j5*yqdovtp vy y2 +gsits at x = + 21.0 m. Where is the center of mass on the x- jp52g qvto9v8y+yyd *axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a tbe ferk;y33b5 yw9zt(wo-particle system is at the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of t(b5w ;93etz3bry fek yhe second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0), c9gsi7g16) jhce5kt feio-. l 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center ogihfc s-)l ecei 9.o517 6tgjkf mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m),dp9*grp omz,) drr9e 1o1per)9*zp,g d mrrd 9 and (2.0 m, -2.0 m), respectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), 5. a/5*,,ytqmhvrlst2uz ps zand a 1.0-kg mass is positioned at (12, 0). What au ttzm/z vssp5h2r,5l,*y.q are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses being located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a whole leg including then+otd+lf em*io9n m*0 foot when the leg is stretched straight out. Assume the person is 1.60 m tald0o*e*f+ tnn +omi9ml l.

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A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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