Physics Unit7: Linear Momentum - 51fly国际课程 (51fly.win)

1#

What is the SI unit of momfd 9 nuk nx-a74e7qqa*entum?

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 cannonballqml w68djst c;2( bs0o, 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 along a frictionless level ygvu.l svdu,-+ uikrg4c. a( 9railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens tgl, uru94u sd .-( kayci+v.vgo 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 frictionli0dhq) yto5d1 ess ice. What happens to the velocity of yiqd5o0d) ht1the 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 have equal m*ts*rqx4u .p9we +flaass. 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 gru* l9rt fx+e 4wasqp*.eater 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 would you++f r0 tlkkae4m .nq/w represent its kinetic qm+w+nal tr/fk4ke.0 energy in terms of these 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 twice the khfp d63 br.1pwinetic energy you gave it in the previous pitch, .rbf d6h3wpp1 the magnitude of 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 in th)/o n2e qgjd u,6h*u sxcys51erms 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 conse kxe+c2-fbr;* zwxwb/ cr/6l krvation 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 j / cp8mn0c6k4m 8bakvversus 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 accur ghktoct k2/6) pth.a0ate 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 om3(w5 0zvn ypa large truck in a head-on collision. Which of the following statements concerning the magnmz(5nv0w op3yitude 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 anqpq2. e xk,bid.zj *n0d the other blue) are dropped from the same height, and reb e0.d .qbqkx,n zip2*jound 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 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 a stationaq c,ghe,co*i 3ry bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Whiehoi, qg,3cc*ch 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. Linearhcj:ar ,nbre9q1a/db: 7d.c m 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 4lg7xo:d wrl7* q vvx*the right at 4.0 m/s. It collides head-on with a 6.0-kg obj odxl *x:47wlvg 7rq*vect moving to the left at 2.0 m/s. Which statement 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 80-kg030c9 tu 4lzvd4xfwth halfback ru0v x09ctdl w u44t3zfhnning
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,h/ )7kpmquyuix2z (r, then which of the following statementsu p)rqmz (7x 2i,kuyh/ 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 capnjz5h v/oc6 2m;bw :1cm ta.onserved?

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 ball and fhxfli,l8c * cs+ ,o/rstops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collif hro,8il+ c /xcsf,*lsion 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 ba)if2n urp0cl) ll rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed afln)fri) ucp20 ter 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 headp jq0)bd;mq*hl(8ay wo29 nlq-on collision with a stationary bowling ball in a friction-free environment. If the collision is almo;db poq9l28)qw(yjm0 aln* qhst 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 ah.ge)aa9o t-f n identical ball atteaohga-f9 ). 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 colli+c7rz-)ow kx yloj2 4ides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy ob 7 kjwlo42cyr-ix )o+zject 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 very heavy obje:t7 -c8wv 9lb9ox p9uei yiz;vct at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after tb9e ucp:9o8liwvzvi7; 9yt- xhe 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 oflyiq y.z (ji1; +3.0 m/s collides 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 ball after the colli1liq;.y jyi( zsion?

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 hea1ez. .zj cihj(d-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows downh.czj(.e jz 1i. 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 mome 1 lq2d-syhiwy7w ;yj(txpg,n, n8h x5ntum is conserved, then which of the following statements is -nldw yh8iq27gx,(jw;5nxpy styh , 1true 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 togeth*zlsqx e5 /3cxer. 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/9oylird2(n/u um;bv *s. It collides in a perfectly inelastic collolr u ;*iv2n(y /u9bmdision 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 exper:q 3w+gcn oagc4j4*c4r y t9;:nhbyduienceydg nwh b+cc4aqgtu4ryjnc4o ;*:3: 9s the 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 wh s oc0,p e;jnv*bpq1i+ite cue ball hits 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 follo2yzg)wu; j0rk em,lk14cs sp4wing statements is false1e2)kypjkc l m4z0g4 r;w, sus?

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(: pi 4 lx247ikdbrmta 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 long flexible ,wnifgx a0;nc9x ))hfpp dt 1wi:p8r7rod 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 f3-b dyx xpq ablh 6p2,*x/)gm)pyq5ybefore hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just afte35yq /bx*xymqba2p6g dx p))yl- p,hf r 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 coe r(2zbbm i9(ilem+ td94xx 2-vcj/ qillision was completely inelastic and both cars quickly came to rest lci-/2z4xv b ( m+bixeqred 2tj(9im9 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 forgi n5: f -,plmdy.j1ld 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 tr9lbp.x sve1ng qp3 5v7uck 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 moving south at 20 m/s. What is th ph09cln(r8m-s v)kft e magnitude of its momp-fkcn8rmt ()hslv 09entum?

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 a4+2l dquw+e)lq qhu (y height of 12 m. Its momentum when it swdylq+eq uqu hl+4 (2)trikes the 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 cx 3wlyc4msxgf72; +zyp2ijm 3ars are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. Wl2 +w mm g23fyxc jzpx43;yi7shat 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, sh rhltvq9isl52w;- jt1u 7f o0trikes a wall and rebounds at 24 m/s. i;w20urt5l 1qv h9 lj 7f-htosWhat is the change 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 mq/p3kkflel w 4han-4 jgadb y13j+, 8moving at 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 the jje 1q-3a8 n3blyg/m ldk+w4fhk,p4aball?

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 /vmj,gc :jnb1placed 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 o/jv 1n,mgcb :jf 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-walking outside the space capsule and isx((h zqwzy.d+t2lux(n 7.cs t 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 2nzwl(h.x7tqt x .cz(sy( +ud 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 5.0cx 9rohq; rlv;7 e;(xs-rpvc0 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 thso7vrq hv(-e0crcxr;;9 x;pl e 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) skatesp6xwgf4zptl4zi * f nwe9s1.g5t9 f 0 on ice at 4.0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As you cog* wew0t 9194x. i ls npffzgz54p6ftsllide, 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 along y y15kd.t s(oba level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mas 1( ky.5sbdotys 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/srau i *9nzrm0* runs into the 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 colr90 in*u*zma rlision?

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, i,o lg9;fwq0g exw-tu8s allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a8q,g;w0uxf tel-9gow 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 negligible 0lbwk05 0ksni friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a dikswl5 kib 00n0stance 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 the rate of 0.8x+u1x jqi o5+w0 m/s (with respect to the log). With what si1+5x+ xoqwu jpeed does the 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 object. The forcoetvn/z4 zpw 0(0 y1mge suddenly increases to 15 N and acts for one more second. What impulzv/zo(e0y4 mn wg 1tp0se 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. What y5cz;n;j00 khi(ay rs is the object's change of velzsk5 ;ah ;y(n0c0y rijocity?

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, travelingt5 e 81evvbtq47szyae+, +fwg 6xhk0l to the right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is tze04y hqwsxt l6,58a+vef+e gvtb71k he 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 pitched to you at 20 m/s. You hit the ball back along ta/,5pvs h qvt/he same path, and at the same speed. If the bat was in contac/5vpts, haq v/t with the ball for 0.10 s, what is the 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 top. f-bppu4*+wzq3 axqno, e9o5xThe speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s en5-b9ozpa3q* p,x+ wx uq4fo, 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 kg, fires 50.0-gram bullets, with a m1f811 bzh y+yp7zsia huzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the f1zi87 ya1+1yhbphsz 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 orde/4 0l:* iqf afqc. hybc.)+bnt9tmgwgr 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 obtwtn:c/0. .m9 gqya4fi clf*bq h)+ gf 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 at the rate of 120 kg per minutos;t:emb( px0i7 :yy din4d7 we. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it d x(t0yb;pi: 7ywd7 omns: ie4exert 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 ve t..bquqq:8o glocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force does.tq bq:og 8uq. 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 initia snzfpo4 aowm1()wk 0h98k4wy lly at rest in outer space. They push each other apart. What is their separation after the lighter astronaut h1o(4on8fskyk9) 4m wa pzw0w 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 tolodk :. .qdhf5 the right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object movk5f o. l.ddhq:ing 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 a2e,v( qrqx:*l5(t71q g ntdg)n( xvrk5lxwzv velocity of 0.20 m/s in the +x direction makes a head-on elastic collision with aq:5wkr r*lng(v( tnv 5txxd(v 1z7xlq)2q,ge 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 fir,08tp b7gy: 8fd vovpe7;kuqxgxk0 i7ed into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) pd:7 8ev70ik7kp;t,fqg bv0xo8 x ugy 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 restm6h85hqo6f /phzz( z( u6re ci, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completelzi/z(6uh hr 5mchoqz e 6(p6f8y elastic, what 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 m/s collides head-on qio kv9d ug 9d/*gmek42; 0kfrwith a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immedikq*ekgoi4 fd;d9m 2/ 9vur0gkately 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 m5lva92d *swuwith a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perf9 al*5 2wdsumvectly 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 collid9r6m93chk*:a,9 pzx oni z cve-ekz; ies head-on with a 3.0 kg mas z*3ri-zkack9pxh;c: 9 9eiv,z6nmeo s at rest. If the collision is perfectly 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 east at a speed of 4.0 m/s collides head-on in a k w y -wxks)vf5e)j;/rin,,ml perfectly inelastic collision with a stationar) wi5swmj)xvklrk ,,/y;ne- fy 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, trav1ae(*:f,n. t ,4c zlyaacluf keling with a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of t 1k:fya*l cfz(ea ctn.,4u,la he 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 a vertical direction buries itself in a 2.4- t f1rjbo4kw;vn- 0xlnhjf8 .e.-v 3yykg block of wood a rest directly abolnr.v0v- 8jjfo.xw1kh 34 -yb f;nyet ve 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?

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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 car traveliw,(w,a h j2ou41dwx +za1n8a -aafcbkng at 60.0 km/h o+4nbwuafc2ax(waakw8,dz ,j ha 11-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 east collides with y8*pu /in 7xmja 3000-kg car traveling at 60.0 km/h south. The two cars sy8 in/mx*jp7utick together after the collision. (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 fr; 6fmbx)z3 ylbictionless surface. Object A moves east with a momentum of 24x3zy f;6l)bbm 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 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 4.0 ,byoj(-.x9+ssu5e27i sim* n lj nfwcx;ta)e 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 fragment? (Neglect air friction.fjtxo+us j;exlns9.(i)w5*2 ,7bcm n-saeiy )

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 = + 21.0 m8t4buec0 n/ks - uvhm.. Where /veku- 0bsn.8m h c4tuis the 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 origin. Onrx go.:*k7lroe particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location o *g.: 7ooxrkrlf 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 positioned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), akpv)4 n hs0ql6nd 4.0 kg at (2.0, 1.0). Determine thk0qln )s46pvhe 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 located at (0, 0), (1.m: xsjos;0-m, q motjut 6go610 m, 1.0 m), aj; m1j-t0sugm66o :sto ,oqxmnd (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), and a 1.0-kg mass ll1 z lvhbp-vw/5a+ a(is positioned at (12, 0). What are the coordinates of a 4.0-kg mass phl wa+-/ zl1v vla(b5which 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 incluru)fa0 b49p0ue cj9 i,ntn1+c xg6 kqqding the foot when the leg is stretched straight out. Assume the person is 1.60 m tall4i jn+aq019tuu)k9eg 0 xqc6 ,ncrp fb.

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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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