Physics Unit7: Linear Momentum - 无忧得胜-网上国际课程 (5edu.win)

1#

What is the SI unit ofwr3x3s)2 ckie ksm8 j: momentum?

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 cannonball, the cannon will recoil backwar* s 0fi.r 5iulm(iy7hhd 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 along a frictionless level railroad tracj(siawr29b 7 u yttc7,k at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. byw9 s7t(2t7cu,ra ij What happens 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 sleddi;ep)j-g f1,j6 mnm pgjng on frictionless ice. What happens )je;nmg6 p jmg- ,pf1jto 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 havdzhic i):mxh 1iw41h ac0j18ias*d) le 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 puttic)h4ihx8: ahwljdszi*c )mda1 011iy sticks to the wall. Which objects experiences the 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 momyll2nl; (vj ,b m6m4rtentum p. How would you represent its kinetic energy in terms of th(;lj tbm 4lvm2ry6n,lese two 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 twicz l-c6up-gt/hq3,9 ae 0mi4be rgk1 afe the kinetic energy you gave it in the previous pitch, the magnitude of its momentum palbe1 eria/fq c-,m6k3gu9 -th 4 z0gis

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 la *ce,r vxk;wsxaj01a /w in 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 conservation of m11wti*j 5vss,dt/ gnq((h b ktomentum.

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 .jzp)n +.ioanvs. 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 is an accura3qr1 t*s fzoa5)vet ,rjq-zsq u3( 1nate 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 with a large truck in a head-on collis c:ziti2hvr2qb0l )z/z/9x,s xmva + qion. Which of the following statements concerning the magnitude of the average collision force is zl vi+bmqhr2x2s09qi/c)zv zt:x/a, correct?

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 red and the oth ja b(6dug-w; n7u4bhxer blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the7gh(-bu4; a6xw b dunj 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 qo:f093ysk, htbx +vh(g , rss4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Whgyf9hkr 3qo,s bxs(hv + :0ts,ich 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 off each other.uj 7upr/1;2sqexyx t9 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 collides*qamy 2,-g cb/or ;srcx5q o1 ,udv6aw head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statec *;bsx qg-ua ,mrvo,d62y/ocr1 a w5qment is correct?

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 rx(v cg j/zv(z d78dde:s u-k180-kg halfback runn-8s7u v/z((ezxcvdgk ddrj 1:ing
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 momentum is conserved, then which of *aioo )zv4i/r0/v13y8yiqu .2z gqr/ eoeigq the following statements is ty a qii4.zovizy/0 /v 2/e1*i8 ge3rqo )rqogurue 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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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conserved? .d 8waxjze/y*)jok ppq 1,ep5

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 ppvkh5h734 jjro, 4g ycue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of co3g5jvr,j4 kh7yp hp4ollision 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 6p-9iham mgg1j;2y8 sl.0 m/s collides with a heavy exercise g-lpy1 8g ; hajsmmi92ball at rest, the beach 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 rigyn *:wkbns+y 8v bwzqjy,322 yht collides in a head-on collision with a stationary bowling ball in a friction+b2b2w:*8 3,jn wz svyknyqyy-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately 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 elastically with an ident lwqtn/s h6t*+ bud,2xvb.nbyg/ ;q 5gical ball at v sw; xlb6.,ynbtgq5u */q 2bhgdtn/+rest. What is the speed of the initially stopped 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 moving with speed v collides head-on with a very lighh2h w4,2aq fr+au2lr0/ofevu mwkv: k6e,*kw t object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collisr:/6vwu2 v* , a mar he,+2qefhwlu2fkwo0kk4ion?

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 heavyy1uho-lp66 aw object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy objehapo61l yw-u 6ct after the collision 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 collides he,qchfjjf u o(o,*p83tad-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What t,j,oj fo *c8 h(p3uqfis the velocity of the yellow 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 head-on with a very ligh./o ljfpcx-qmu 42v4xt objfl2qv- coxj 4m.x4pu/ect moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is 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 conservedfkopdg/oept nv;k 37w1:+k hk5 h-*iz, then which of the following statemen3k/ hkh +oz-kpid 1:vp ong k7etwf5;*ts 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 together. z29pulv))np z 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 perfectly isul3dlvohwq7gj6*v3 f k 1*j ,nelasticv oh367 d1uv3 sg, jlqklw**jf 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 obj ms 27v t+ntcrb5lvmf-0p7-ug ect and sticks. Which object experiences tnl7u-f sb02rvmct7v+g5-t m p he larger magnitude 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) u9fgpzm mva;5/stx - #9 ball and is deflected 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 m. Which of the following statemenaeukt -k3 q:r5ts is falsekr- u:tk qe5a3?

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 followin)oj *o,7 puyruqa,bi 4)vw gh8g is a false 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 long2nw p8torv74q flexible 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 exploxh,g ma.ch(1 bpjdc70 fqv)d8 des before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragmepcm1xhdfqh7d. 8,gba0jvc )(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. The coll1.l pp :pvj9hxwn*ice70 s+9 kw5asb iision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocph . v :p pi*91 wbls5709ciwnsj+akexity 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 for a system of parti6bo egs ve *uz ;)y*.enub4w7nnbn 9rw;js2l,cles.

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 mxls2p c)4rl 6of a 2000-kg truck traveling at 35 m/s?

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 movih1)ae .0ip kging south at 20 m/s. What is the magnitude of its momg)a0p1iek. ihentum?

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 kyqb- l;6 ; p.jlej,sngg is dropped from a height of 12 m. Its momentum when it strikes the groe;-jn ,js b.;yl6lgp qund 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 each other. Ob(h g+ ar+,pn3(ei2p+eoycoxne moves with a speed of 25 m/s due north and the other moves atpinae p 3g++x,+y(oh(ecbo2r 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 30t*1 9j rsk62f ftld*jz m/s, strikes a wall and rebounds at 24 m/s. What is the clt**f6k9 2z fstr1j jdhange in the momentum 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 moving s zkmsxw5- (+vat a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of kvs(s 5-wz+xm 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) iqb g:v)mp4kd :u*kmk 8km0:3lzp0u rvs placed on a 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 machi k8::mbg3r)k mzm 4k*uku0qd :p0pvlvne? (Assume 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 outside the space capsule and is statioqag/e 2ti4is .gohd 6*nary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at ao4d e2/i6.gq*th s iga 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 h1yfp/ 0tbig3 *kekl .8b3mhpmomentum 5.0 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. Wh0 13bk pfk/h3i8lytgmb .*hpe at is the magnitude of the large object's momentum change?

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 ihk0y7i3b3e f jce at 4.0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed d703fkije3 hbyo 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 t: l ;o(fr+bzjdanlbv/q4l:6 whe right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of ma:ol4n(vf rj6l/d qa:z blbw+ ;ss 200 kg. What is the 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 traveling at 25 m/s runs into th76,x oi ;k2doqt1 +ghwht-jki e rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of the cars after the collisi,q7xitohw hjk- 1ig ok2t; d6+on?

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 cw 1ll,x,c:(5ybc hb2pr;gq eb)k 5gsvar, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples w 2;lk(:rgv5bp1e,g)cy bb,qxs5lchwith a 50,000-kg 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 negligi2 ica txsd 06cpt2i)7 eg5r2ftble friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straigsetii )6a2r27 gdt2cc0xpf5 tht down a distance of 4.0 m, and lands in the car. 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 thez97dda h0d 74 +zpyemnxo al.9 rate of 0.80 m/s (with respect to the log). With what speed does thzd.dd9lh oe49m7xay+pn z07ae log move, 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 an+wx tnu wsb,6h g,79ul object. The force suddenly increases to 15 N and acts for one more second. What impulse w uls 9w uh7gnb,,6xwt+as 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. Wg/r75jrokt3d bgnp 8- hat is the object's change of velocibjp5gr3t7 o / nd8k-grty?

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 the r0vnf0j;5afl7vkr/uwo c, *ryo en +1kight at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is th,n/n;r7+0eou vr5 1cjolfyvwkk 0a*fe average force the car exerts on the wall?

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 pi oezy u 5z r/rv07ect,4m+wt:vtched to 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 the magnrvv owt5+ze,cu rm:0e/tz 4 7yitude 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 top. The speeds of the baq5i6,je-u/ wo 08 (pw5mglgby :e tzrnll right before and right after hitting 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 magn qiwet5woyn 6e0rpg(:/m l8-uz ,bgj5 itude 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 kg, a-v7kl-6shk o fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rouna--sol7kv k6 hds per 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 t r ,kmc;dh8p+pe2vs3 u(-mfua burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg pmv,e8mu d;kh+fut3 rs ( p2-cper 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 horizontaqyn0h.8 fvelv4 s,hv /l drainpipe at 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 does it exert on tv. s h4f8,h/e0qvln vyhe 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.p0p9zz91nu kr (vyl/ x12 kg, achieves a velocity of 40 m/s after 3.0 s, when fired st/ (z kvxrl909pz1p uynraight up. What average thrust force 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 a2luwde7;d6 8zpm (s c 51m,;x nxclqnut rest in outer space. They push each other apart. What is their separatio 27 cep u,8 n(nldusmc;6; qwxdml5zx1n after the lighter 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 speed xfl*q44mts. 6b oyr;7 xd0dmnof 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the lefm.dr4xo 0;x7nfb 4q 6s* dmlytt 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/s in the + :a(4xsmoj .y*yxaq e0x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velqya j :oxea 4y*.s0mx(ocity of the 0.10-kg object after collision?

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 300 m/s is fired indy h9lhpua( b(s*zb 42to 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 coll2(s4udhla p( 9 bhy*bzision?

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 (wqmp2r,uawxthg --;q 9 hich consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equ-pq,xgu -ar2mh;t w q9als 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 nm7;bpa0z :ng qsf. 2ia stationary ball of mass 100z2bg0a;. pn :f qsinm7 g. The collision is elastic. What is the speed of each ball immediately 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 3.7,ck c3vgs(*o va(ygv,0 m/s collides head-on with a 200 g ball sitting at rest. c v(v3s(,vko, ya gcg* The collision is perfectly elastic.
(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 with a speed of 5.0 m/s. It collides head-on with a 6rm-qn/hi s4ftkzpu21d ;12o n orx1p3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collixrfu 2pzo;-o1 n qrhpsti146 /1 2ndkmsion?

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 east at a speed)so7j,c,gs +b9,mm k df5unlh of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kin,)s g d,9huj ,7n kb5fom+lcmsetic 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 parked station wagon+53-y ojz e7h qrw7nfd, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kine7d 5 jqo-+wrfn7 3yhzetic 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/s in 9bdxtqtg+z:5a vertical direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, thexz5d9t b+tg:q 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.s*0 :2n imw/umy . lzact9r u0pi,+7icsor,ni0 km/h east collides with a 3000-kg car traveling at 60.0iy7t zwn*ra m9 sc2.0,mspr on:u +il /i0ciu, km/h south. The two cars stick together after the collision. (See Fig. 7-1.) 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 90.0 km/h easr k:8h+zw:f ll)bq4oat collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision.lkbf+lq 8a:wohr:z4 ) (See Fig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

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 l ,jjzv5gmj3vb xc7g*+ie; 3dfrictionless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. T3mbgjjv*ejxgl5+;d ic 73 v,zhey make a perfectly inelastic collision. 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 apd 5fskv9ye+ 8 velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment 89d+ske p5yfv 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 fragment? (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 sits at x = + 21.megve56.e z wr,p-q0y0 m. Where is the centevqg.re e60ze w m,5py-r of mass on the x-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 two-particle sngy k4l jts,-,ystem is at the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What iss -j ,4,ygktnl the location of the 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 posixr qcfd,3zx; 7tioned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coorf c ;73q,dxrzxdinates of the center of 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,i :nvf/3+ y fvt4nvzj4 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the v4 yj4+n iv 3vtzf/:fncenter 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), and a 1.0-kg mass is positioned dq++mqr/3qcw r2tx 9u at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the systemu q2+qd cr/xt+rqmw39 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 positioxeep- p6kva: 8qla/h (n of the CM of a whole leg including the foot when the l axp:h8-p6qe(ek/va leg is stretched straight out. Assume the person is 1.60 m tall.

本题所包含的其它图片:

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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