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

1#

What is the SI unit of momentue3z34:6q mf4cbc a;u4aqc) ikfai1 ohm?

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 a v -5fu5a,qfxwill 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 railroad track at constant spe bg6 za5bdfu it0u/398yw6 .wbu moos9ed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the yb 0o6z/uo.adg 9mu8b6 3witsu f59bwcar?

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 dv82,vwee mr5 qscq ;p7tw8*y sledding on frictionless ice. What happens to the velocity of the sl,*d e7wqsq rtv8m cw;v2e85yp ed?

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 mass. They are(9pbdq fcjdeff 6z054 thrown with equal speed against a wall. The ball bounces back with nearly the sa6f945 ( z dpqcbjffde0me speed with which it hit. The putty 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 momentum p. How wvw tjo xn64cvjkoo-4- rf2 zs)d9o t1-ould you represent its kinetic energy in terms of these two quantitnvf9 wztjkd4 o -6os-c4-1vrt x)jo 2oies?

A. $p^2/2m$

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

C. $mp$

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

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic energy you gave it inxmvavs;)89 shfrv1 0g the previous pitch, the magnitude rsvm g xs8)af ;h19v0vof 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 terms of moment, t czav-6k,i*jf. nbzum.

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 +v x1/jg0 qc68 knqigtof 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 cn)usfw.4, cr p/uy g0murve on a 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:pjgp(wy f-e7s r,n,or9v5j a an accurate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collision. Which of the fo/zj 1-2fppxhuj8m, * vuy9btpllop j8/zyxf12 jb tuh 9p*u,pv-mwing statements concerning 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 drr mvf5jpdlnr*y .n;+ tq00iycoy(,x4 opped 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 durjqfpdvr0oy(rn*yiy;t0m+xn 4 .c5l , ing 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, collibx-pemwmssv )15aw189 (u0 xe0 u orrqdes with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse 1ex8x ua sop0s-()5webwm0v m9qrru1during 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 eachs : *2uu mtd:0m)twckw 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/s5 l5 bk1b.mgys. It collides head-on with a 6.0-kg objlm.yksb1 g5b5 ect 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 b) ,3( apnjbsoan 80-kg halfback ru,pb j)s3o(nabnning
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 8im9z my *okv2m kor);momentum is conserved, then which of the following statemekzi)v;o y8mo2km9r m *nts 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 conser. +*deid xuyr4dcqo2gcs78g. ved?

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 azoexlpo2 8;o )13i jsh2gx7rcnd stops, while the #5 ball moves away with the same velocity as th2e cj;l8hg1 x 7)2opxz3oiorse cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 mou:nyn 83ssvz-wg0 b3/s collides with a heavy exercise ball at rest, th8n s3s- :3nzywgvobu0 e 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 right collides in a head-on co*yx:l g9 .iaatllision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball ii ly.at9*gax:mmediately 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 elastb)d ey0;m0os ./yk3mn* q ejfyically with an identical ball at rest. What is the speed of ;s .0yeqf m mnk)3d0/*y jbeoythe 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 6us w vh,w3ecaud 3()e7 2soaslight 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 after7)u woe6sev 2das hwasu3(c,3 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 ogr6d0f:i8 :wz pe e2nvbject at rest, in a frictionless environment. The collision is almost perfectlep r02d8ew :z vg6fn:iy elastic. 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 m/s collides head-on with a yellok)* jy +nmm-uo w;qa;ew ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the collisi)n -*qauo+me;mkjy;w on?

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 light ch rvcqx8 kg03l9cy,,w kvb8( object moving with velocity -v. The collision is elastic, and there is no fric (qy k 3rv8gcwv,k9bl0ch8,xction. 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 conserved, then which ooqoa 2 +4dios-f the following statements is true about kinetic en +-qosia2 d4ooergy?

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. Kinetic energqfhve(y3alvv 838- r q0rok/jy

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 ary 1zqyu* 4;q4notg/i7qt5nl t 4.0 m/s. It collides in a perfectly inelastic collision 7;*4yqqroqui/n4tn1z 5 gt yl 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 witrmz/o2*ovt /th a large object and sticks. Which object experiences the larger magnitude of/z o/tm2rov* t momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and i yf28t.3,fm2gg rae uns 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 ths9t ;.k w /jkw4v aepxdvs:/ 1gnvc8l*e following statements is falsekcpv:k t; 8v lev aj4*.sx/d91/wnsgw ?

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 statemenn nq sj mj59odude)z4z +0,b1xpl29;hzgwj( jt?

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 lonk xka zab.d4h8p*p o65g 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 horizontp xkz bv)z 12*t *ajn:rboeoz24b 52wsally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of 2 on2bps)*bvo:wx a4z*jzt15zb2erk the bomb 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 friction1 qxg2oe j)/u6gmx7 mw-free road. The collision was completely inelawmxgq126jo/ xge m7)ustic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

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

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law fydpgntsfzn6 , ma8g5)(uacq-* 1 6w tmor a system of particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck traveling at 35 m4 m7 ldgyq3r4i jiv0-t/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-utt rm6 6q.n ixt)ey(e uq2xrnqxj7k*3x7 o0 e magnitude of its momentjq0-xe6qt x o3e x7nny.uurq6 7(*t) tir2 kmxum?

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

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

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

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

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 0.10 kg is dropped from a height of 12 m. Its momentum whelqq5a9w5 w/n c1e78yvsbp e o8n it strikes the ground iw/q 9 817qsn o8ycvb55eelaw ps

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 perpendiculaq t0l (+yake8ozu 5bfh*vwp5 9r to each other. One moves withv(58a fbz y 9pkwq0tu o5*hl+e a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momentum of the system?

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

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

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

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 wvd)rox60 t sh* *qp5am/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentum ofsath r)*pqw0d 5o6* xv 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 struck sn nq1r ogv 82 xkl8/1s;xe qpubh9u/0by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the cqo1qg 0 hkpelsun8x vnbx9;8/2 1/ru shange in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching macceanuv 6 , 61wousz67-3wfo.guz)fd z hine (excluding the baseball) is 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 pitchz uvn6g cs ,716e.w6z wu-fuoz)3afdoing 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 spac gtql0lb3m 2x 9crzc-z 11q9eue-walking 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/sg ql93cu1rm0zt 91q ze 2bcxl- away from the capsule. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approachawc7:4hu.)2 y;auv8l hxknv c es head-on a large object at rest. The small object bnav7wh yl2cuc).x; ak4v 8u:hounces straight back with a momentum of magnitude 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 yo4b kyjv;kom fl;-so9;ur friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both move l mbkv;f -;y 4o;9oksjoff 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 rightdunpx ;dsh-m45 xa1(zr9 h2qh along a level, straight road at a speed of 6.0 m/s. It collides92 m p 1shhrxz4d5h x;u(aqnd- directly with a stopped motorcycle of mass 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 ru1mc8. 21 4fpfbqvnrfm ns into the rear of a stopped car that has a mass of 15bqf 18m cvpff2rm 14n.00 kg and they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to c4o:97 w65 szfe/iq 6gbp blkndoast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed b9qn7g 6: spw/e5oib6l fzk4d 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 m)zcb 9fvz+5 8ah/milzs3e3s 200 kg, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be movi)mzmze9 s/l fbi+8cvzh3 5 a3sng 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 r,+w pf njwzgsl p4h7*x)zf-; aate of 0.80 m/s (with respect to the log). With what speed does the log move, wihnjzpw*fa 4spxzg;+f7 l- w), th 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 force suddenly increases to 15 ,9t8rc qvi5 jqf:w(t0qks0b mnz0xf 8d/g+ ijN and acts for one more second. What impulse was imparted nx qsik(f5b0r,:ijmt+q/ 9zd fj q8t0vgcw08by 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 objectlv j4rl8rj i;+. What is the object's c4 rvlji;8rjl +hange 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 with a brick wall ,;gc1pg2af4kug/ s wgand comes to rest in 0.20 s. What is the average force the car exerts on the wacfp;2g wgakg s, u/4g1ll?

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 20mudh t;.66 jhe m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball6hd.h 6;meut j 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. ,to9fjho*t1n The speeds of the ball right before and right after hitting the jt tfh*ono91 ,table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets,xkzp5tph.:ps+v d r *( with a muzzle velocity of 750 m/s, at the rate of 300 rounds 5kvxph.zp rt: (d*s+pper minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building i anhbnkqw v3le:54 w37n 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 ohkn3 3 wen7 b4:qva5lwf 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 1x/q g9o;d:r qx20 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splas9q;q o xxdg/:rh 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, ach57m hj06,8tl2fwcq:d pe blxoieves a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force does the rocke6,205b doempl8xf :qlcjh 7w tt 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 ax qbg.5g;ia0 dt rest in outer space. They push each other a;adg.g i 0b5qxpart. 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 to the right with a speed of 2.0 m/s. It colliltcuf yt0 if1rxh9 mu726pq6/l i55cldes in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total ifqyi7f2 hc/cmu65l6xtl ut09pr1l 5kinetic 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 velocitqk/h8 br. qsv4,q 0iity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object 0q rvqkbi.i4h, sq t8/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 1.00-kg block at rest. The bu t,k ;rxcsf*yi*i:bz- llet emerges (the bullet does not get embedded in the block) with half of its origzcfii*s-yx;:bt , *kr inal 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 head-on byd,uhk/azm6zm 43g xd;xj c;v, an alpha-particle (which consistsu,g; kcd ,md 4 xa3;6mzzvjxh/ 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 equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a statiokzhb fqq. u.fsu ,lrt+2+ j0c+nary ball of mass 100 g. The collision is elastic. Whatuz,+b+trl q.scqhu 0j k2f.+f 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 collidx57a6tdd,1leuf jsqm 9o s q7:es head-on with a 200 g ball sittin, q m57e7:f9xtqs1da us6jod lg 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 3hhs;b.i 9npxrpi/i 6) .0 kg mass at rest. If the collision is perfectly inelastic, what is the/i ppi) x9r 6;i.hbnsh 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 464.2w-ufqolf . m kvfc.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. Hmuq-4fw folcv..2k6 fow much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a ps :lo9u 9raov z.,cik:arked station wagon, whock oul. r ::oz9s,a9vi's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction buries itself in aoo,k9nl jypmfz(5.r( ak:rxq114 sq r 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination mook r5(p9frz.a 4ykj1s, 1 qn:mr(lq xoves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 30w u5p41-h74wga0xpdci4kgapr gso -3 ih - u3i00-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the ic0ihs53ghupax p44 71kr -u og-g-a4dpwwi3speed 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.( 8iyrzc4 13yu2iegv )mp-k z,pcvkl8 0 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direct(ky k 18py,rlzgmciviu) c38pv 4-2zeion 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 frictionless surface. Object A xob qdqen*140moves 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 mde q nb1q40*xoagnitude 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 towardg;+ (smek/oa t*ouod)fu. dl 0 the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with atmk( .oad /lsooe)f0u+;udg * 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 thedl/ud 0;+,jkwi c,c tk origin, and a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass on the x-ak,dwk/i,j ;0l ut+c dcxis?

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. One particle i 0qewt j e1/z;olskh( w/koem,ha73:ms located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass ;oakqe:w/m3 k,mw( szeh /7leo1 ht0j 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 dx/d5dx e;ov9 (0, 0), 2.0 kg at (2.0, 0), and 4.0 evo d5d/x 9x;dkg at (2.0, 1.0). Determine 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, 2.0kyo0faj c75 e 5ncch+)b)e)8nhz9tc p kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and +zfhnec9tb ejh ycn0p k75 )5co)a8c)(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.a-gyl*c v*ksad2 9iy; c:+8nvjt pq.d tqi 0g+0), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will resuc.** j+a lkpq+i:0ndcyig q2- gvs89 d;tvaytlt 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 positionxyz wofz+/r, 1 of the CM of a whole leg including the foot when the leg is stretched straight out. Assum,y/ rz1+ woxfze 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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