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

1#

What is the SI unit t pibj jm6jz.8.nyorh+ 2h+a7of 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 bac 6ybq +xk sr)7;r fz)hjhq)0qkkward 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 raio(u7 s3(ffp; t napjvik;(u cd9ka46qlroad track at constant speed. The car is open on top. A large load of4is;j7(k9(qf6pa; kao ft(uc d3vu pn coal is suddenly dumped into the car. 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 sledding on frictionlessg0gi/( fn60t(wm b+ebqqas9x ice. What happens to the velocity of the /sn0q(qt6bew ax+9 imfg 0bg(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 putn7mqy3dw50a omdo jn 3r( p3a3ty have 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 the grea7 o3dnqd3awn0p3a35m yomr (jter 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 withy*sjeyy lv1odp d13xh (,8pl2x 23 rgz a momentum p. How would you represent its kinetic energy in terms of these two quantitie3 *8egxdslp3hpo 1(yj21ry 2,xzdlvys?

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 wn6ac(q( : u*wt nfha0mith twice the kinetic energy you gave it in the previous pitch, the magnitude of its momenqa *6u( :(nnawt0fcmhtum 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 in terms of momentum.6(mp40 6nrgs(9,b gss j9ctsub b8epz0 ark.d

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 o/2un: o)i6fubj 2nvaz f 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 lsxuxm.,:x ixpx876 xa Force versus time (F vs. 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 accurate 6 wf*zch- ga4wstatement?

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 io/ediru,l7uoz q4 i 4-n a head-on collision. Which of the following statements conce l4u/dz o ir,qeou7i4-rning the magnitude of the average collision force is 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 other blue) are dropped from 1 q3am1gfrk ou0f.hlkhr/ pnt353 kk6the same height, and rebound off the floor. Thp / r51kk30mfk31l.qkhn 3hr6f u tgaoe 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 spe- +ng0 r9gwj-* u :4 sgc whqaixxkbb5*znw::eed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves ve wb*ck:zug-qbxh wg+a ::nsj9ir 4e 5*n0gw-xry 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 andlxe1 -h+o b;o(b*j lts bounce off 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/spf uyf((si.n. zr/hs 6. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement ir.fsih p y/n.fuz6s((s 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 linebackejt0,hrl2 j)ws n,bz ph:js7/rr moving at 2.0 m/s tackles head-on an 80-kg halfback runningrhtbp0 z)nshs /:r2jjw7,l,j
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, thez2u. t, awq9 f-,(c /uiehidixn which of the followingc t2i,h.i(d- i,ezauqf wu/ x9 statements 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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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy cont v30hw5l 8pw9lwd7tk1eng0uga6z b9 served?

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 c7lgneng( ( 8 tmtrkol:v-lw86 ue 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 collisogek(lvg6-n r(7 ttl lm: 8w8nion 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 w/-h m1gyck;ww er;x q2ith a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's cwqgk/y1emwx 2;;hr -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 3e ynl)4q86ba hnm3h;w .0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly el;bnh3)4n6 y wh8 emlqaastic, 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 i2 z3cfn(xnd.9 no7xardentical ball at rest. What is the speefazx.nn3 don2 cx r9(7d 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 light (kd;5b1 iepc h jlc9*kobject at rest. The collision is elastic, and there is nb pi9l ;he51kkccj*d(o 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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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 rk. 6etitenre4:c , sj3me89i very heavy object at rest, in a frictionless environment. The collision is almost perfectly ela8e,nmk rij:e 6 t3strce i.e49stic. The speed of the heavy object 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 *rb x9uxd*/y s,ku es2h)xldi *.ajj*m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. Wh yihxj xakse**ljsu* dur.dx9,b)2 */ at is 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 col1gjq+8nbzwt ( lides head-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. ( nb1+tg8zq wj 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 thersyl; ,vh5x.y 1 zar4g momentum is conserved, then which of the following statements is true ahv zl;r agr4yx51s ,y.bout 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 st*)y vgh7 q ,gz4xz.m)dry vzm5ick together. 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 collw, +mz2kab jb-d.vb3rides in a perfectly inelastic col3ma. kb,2-wjzb dbv+r lision 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 sticks. Which object exh4p qh9)vz:j/ajkv x0periences the la)/4hkjj 9 vh qxv:pa0zrger 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 hiey2y i 1xs9ez w5zr6j*ts the #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 s j1m7 tci, t, ibcx5tma:gm25statements is falsb t:,1xsi5 m2tjc m,cmt 5ai7ge?

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 false statemg2jhajjp0z6r v:;vnou-,s/4 h, s bysent?

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 t, a *hrdcns;(52ktd+1zrmm kflexible 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 horiz3* jtvfhi 45c6dwp,haontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the b c*w4p6v5dj h3 fait,homb fragments, 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 collision was c rzv4a4a0ih9 k u691ys l-vjhkompletely inelastic and both cars quickly came to rest during the cojhvy9a4hr9uv aklk-s z04i 16llision. 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 lawz,y2tk8/feth o9 i2gw for 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 traveli m bc(*ojqdm,uo6w*8 s(/gj nk49dr xang 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 movh5w mxfu2hu x g,.)7w1 +iyeywing south at 20 m/s. What is the magnitude of its momf wxw2.g1h5uh,xywu 7myei )+ entum?

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 isrks(mlpw 24i g714agz dropped from a height of 12 m. Its momentum when it strikes the groua 44psmz(r7 kwilg 12gnd 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. One moveshc 0pop.,3eke3 vzk adr+y+ giyc5w) / with a speed of 25 m/s due north and the other mhy)e.wz vc 53kcgerdi0+ pkao3+,p/ yoves 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 horiz-rcuypu;(m c1sa6b /pontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the chan( ;p1r p-6ucscyaum/bge 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 at a speed of 12 m/s, is stru6mt+e *ljq2ev ck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in v 6tlejeq *+2mmomentum 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 a frozen pbpetn 0exx.;(u6o6w) 3ewdcd ond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed e ) wc;be(edn d0tp3wx.xo6u6of the pitching machine? (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-walkingyaxvcg7k 7wragnml 9. (lmy;+ 2- z2jj outside 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 space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule mg(l7 2zj;7ajn. cyv+rlm9wkyxa-2g?

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 5.0 kgm/s appross9pds7r- jtai*v:q2 j 9 n5praches head-on a large object at rest. The small object bounces straight back with a momentum of dp5nts:2prqi7s r*v9 jj-a9smagnitude 4.0 kgm/s. What 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 ice at 4.0 m/s to greet your friend (vp;acw o 4hv-:40-kg mass), who is standing still, with open arms. As you collide, while holding each other, wov-4wp:v; ca hith 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 7e7z;gs m.. hxm- vubpthe right along 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 the total momentum after the. v xp-7.meg uz;hm7sb 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 *an q/kqik1jz9 3tgdo*+cf+v into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of t9+g qa k*oc/ 1dvj zktqf+n3*ihe 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 car, mass 15,000 kg, is /3 vn3 pzhqu 3 9-luq6)-nlbyz (nvbqrg3nj)y allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples u9(b- r y yjzqz3v3)3 - /vbnhpgnlnql)6n3uqwith 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 negligiblmw*is3,iv: dl chd*7 /r+ yxo.ndfa0re friction on a horizontal track with a speed o *rir 3d,h.*/:yand+iscfo x vw0d7ml f 10 m/s. A 70-kg stunt man drops straight 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 odo3sq sdc;t+m--n .i;nmn vn 9n a 100-kg log at the rate of 0.80 m/s (with respect to the log). With what speed does the log move, with respect todq i+m v n nnto-nmc9.s;;3d-s 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 object. The force sudde667c(l xw50enlku; ygh eqf3nnly increases to 15 N and acts for one more second. What impulse was imparted by these forcfnu5n0yew; 6(l xc 7klg qe6h3es 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. What is 7i*0)m w 8gjy;vvs 0an8fn xghthe objec nsa8gwhv*8nviy7 g;m)fj0 0xt's change of 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 the right at 30 m/s, collides f4y,pbcfa1f q*4q5ecwith a brick wall and comes to rest in 0.20 s. What is the a ef *ay441c,bp fcfq5qverage 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 pitc 9vw:07l.natbqoh 5vphed 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 magnitudep0bah9.vwl n:o7 q5t v 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 z3k*b:wp/ * f4kzngbjonto a table top. The speeds of the ball 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 magnitude of the aveb:*z f/jg b n43*zkwpkrage 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;ukn fo/:c-c1an f) u 0zw;zyy, fires 50.0-gram bullets, with a muzzle velocity zwaoy yn nzk/; ;:u1fcf-c )0uof 750 m/s, at the rate of 300 rounds 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 a burning bui*bde) h/esq8 1fys:u xlding in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the watseys:d h) e/81x*qfub er 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 at the rate of 120 kg per minute. 5 taisu u 87z,yho,n.hIt falls 3.20 m to the ground. Assuming the wato. us8h ,t57 nyz,auhier doesn't splash up, what average force does 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(nz vufpga;o)js-32 rpby.z* fired straight up. What average thrust force does the rocket engine2zgn( ;.-r p3uavz*obpyj )fs 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 massesekxk n8: 7; o*c u2s2zqvw+ry* * .8wscpqutki 60 kg and 80 kg, are initially at rest in outer space. T v.tk;*rc u 8wnwc*sxz y8:qoq kpus* 2+kie72hey push each other apart. What is their separation 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 t1t0cqfo3q+pytr4xze ) 6:x*-b ovott o the right with a speed of 2.0 m/s. It collides in a perfe 1*0 ovtzepqq-xxr3co4y 6t t+tf ):boctly elastic 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/s in the +x divws , ri*ag*nc vtkez 5)g1q82rection makes a head-on elastic collision with qwk* s8,*2n)av tegvgc5i r 1za 0.15 kg object initially at rest. What is the final velocity 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 into a 1.0zk)) a:osgk;aa uz(qc fw*2r3 0-kg block at rest. The bulloaqaru; fk*z)z2s()g:w3cka et 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 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-8ucv)w fhuhk u/d:o 6 head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, d6f/uu8vu)-h:ko c whwhat speed will 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 mh76v*xc;wn x5 4wemx k/s collides head-on with a stationary ball of mass 100 g. The mx; e4 hvcn65x7w*xkwcollision 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 3.70 m/s col - :z2/nqymb63i troahlides head-on with a 20/ y-2 znbor tmahi:63q0 g ball sitting at rest. 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 3.0 k*ogufb+lk++ lh 6)oo mg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collision?lb+ 6+ u+khl)*gofmo o

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 of 4.0 m/s collides head-on in a p 8z ogia+x26iterfectly inelastic collision with a station6 ot2xz+ga i8iary 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 veloci)jcfz,0a5gh yfe b.y( ty v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic col,hy.b yz5fae) 0f(gjclision. 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/s in ar+u8 ho1jmryb2oqyril(;w*2ldid6 . vertical direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves vertically upw;dy or2l+8ybm*lr2jodri 1iw6 q. uh (ard.
(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 collides with a 3000-kg caryne4e2ci8h0+ezqd s 3v ,0l eq traveling at 60.0 km/h south. The two cars stick tog+i,0ynee s4 le8zvd e2hq q30cether 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 east collides with a 3000-kg c0gk k;ku3 n /kl / d:cy2cle)brv0ndj-ar traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of mkdl/0l0vbn; n/gdrkk ) 2ujc-ce3y k:otion 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 mo-0p:ti6 vdj( /vepokvves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magnitude of their combined momentum afterdt-ppevo j(vk :i0v/6 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 towardquq.fqo+6wm 4 the North with a velocity of 4.0 m/s. It explodes into three f 6w4mq+fqqu.o ragments: 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 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 origi0 tfw01wbt*t ;jdvxa,n, and a 10.0-kg mass sits at x = + 21.0 m. Where is tbxdj*0vat t01,fwtw; he center 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 system is at the orioqufyr:bx96u00a(q bgin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the sef:r 9bu aqb6o0 (ux0yqcond 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), 2.0 kg at (2.0,7ze0j3r4l y5nt )odxy 0), and 4.0 kg at (2.0, 1.0). Det4xo l5rjezy 7ndt0)y3ermine the coordinates 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 w,7: ,1i ihfj /xdbgky9jb6nqlocated at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the loca17,h9iy/ gwn xkf bjbi: 6q,jdtion 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)13 ku+fxdds2i8t cqh 8, and a 1.0-kg mass is positioned at (12, 0). What are the coordinates offq8xhcsd8u+2 3 td1i k 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 calculzv2u, wgff)(nate the position of the CM of a whole leg including the foot when the leg is stretched straight out. Av(u2fwz),g nf ssume the person is 1.60 m tall.

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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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