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

1#

What is the SI unit of momentum?qi.9i 5(geyrpd w3msif 7/ sw5

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 cannonbay g,p giw-s((rll, 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 raiseqvz/0abjoup)x841k5te7 6c v g op-lroad track at constant speed. The car is open on top. A large load of coa go1b-uje4xa8v0ozpv t)56p/qec s7 k l 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 frictionl( lit)qm/8zz y 7i*m rx(:zfxqess ice. What happens to the velo)qfi*t r(ymxlx7 (q 8zzmi/ z:city of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equ:53edh kb)rrwal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed wit wbrr53 )kh:edh 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. Ho i ;u,ulic-l(bw would you represent its kinetic energy in terms of these two quantit(;ilcu , iub-lies?

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 ;1iri9g8tj*;i lxpl h energy you gave it in the previous pitch, the magni9l1gx8 pjt;il ;ihir*tude 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 seconof g9 vi6ii5e2ybv:1kd law in terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of cxxq (5,rtf a6 (ptbh25wz2 ilmomentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t) grau05g d1uckm). t t)bwnph 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 statement n2;sjkxxc6c8 ?

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 inlwr30cy 3t70ghv3cea8b9h r j7k(p pd a head-on collision. Which of the following statements concerning the magnitude of the average collision 3pgrlyh ktjh c8(r vd0ew 9p7a03b37cforce 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 the sameprijjbs., 0b:2t ow,f,vm)8 dj w qj3w height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collisionsd8:w3 t bqjj,)2pf0 b.jwjvwmr,o, i 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 y4wb0 ei 1gxlgfr 959y8u-bmj a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball molfyy9ujig4-8 exr 1w9bgm0 b5ves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

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

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce7(d jtj y6c6bp 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/s. It collides head-o1(/1q tq /idd-nest ku/qv:ofn with a 6.0-kg object moving to the left at 2.0 m/s. Which statement idkq1odq/ 1 t/vqns:/efti(- u 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 linebacker moving at 2.0 m/s tackles head-on an 80-kg hl jj j;y41lf;ialfback run;f41 jjl jily;ning
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

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

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, th,/;mki t y-646 rb;u)hrbvu,gxz8 lcvcxy8ic en which of the following statements is true/)lhu6 m v i xy;bc urz;t8, ,ccbgr-k86i4yvx 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 conserx:ufs ujjuqw/1za xk*n 7y,/8ved?

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 bf.ttg9:1r5 2cpljkxzfbc. f5all hits the #5 ball and stops, while the #5 ball moves away with2bz .k t.tl: gcxf p5rcjff519 the same velocity as the 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 m/s collidetqf9bewvs2 wy)7q46f s with a heavy exercise ball at rest, the beach ball's speed aft94 q tfw672y)ewfvsqber 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 collide++wi7 gt5 sk:.3pdssya or9 uws in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfec+t+poka gri s3dyww5s7:.u 9stly 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 wi1tsh q j5:f2epth an identical ball at rest. What is the speed of the initially stopped ball after the ce:shq2jp1f5t ollision?

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 hea :,a ;2xsmqhx :y7lyiyd-on with a very light object at rest. The collision is elastic, and there is no ,yyl2 :sxiyhmx 7a :;qfriction. 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 v .w;p ;hsar7jpery heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speedw; a.s;7pjhpr 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 colledyes+4 o .b1jides 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 collisio+j4e.dyos 1eb n?

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 headcd9oyfry ai6,ew4ix c/)9y3z,xj4li -on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object z)4y dwixy 9iyol6rxfaic,je 34/c, 9after 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 w n71t,gxj .avs8qqsdrt al7dxp.-(zd npi5:.hich of the following statements is true about kinetic enerx.x,rdqznal7.ia gd p75.ds 1ps-n vj(:t8tqgy?

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 stig5vnfv4v ,2v3l*j jpb:ak3jick 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 ,vw y(4wpq e)mo2z yk44.0 m/s. It collides in a perfectly inelastic colli,o4y(wq2 vz)m4k e wypsion 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 stickp()f ya(y f2u0lhcfi(s. Which object experiences the larger magnitudi0y2pf hc (ya )(lffu(e 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 bb5*0jq tvc blt53t .rdall 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 f 5.voobto gw;3 p561i4h1gvbw7vwm d gollowing statements is falspbi.1gwo1b vtvh5 4w6gvmdgo7 35o;we?

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

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

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

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

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the followin gcm:tos t49h :1lqf9e 4cmm9bg is a false statement?

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

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

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

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

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk with a long flexible rod in order y *j+i ;chqe-hto

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, whi tn u+ pmn- mj1hq.npz0lvtibiw2-hl.2t-0 + sch explodes before hitting the ground. Neglecting air resistance, the center of mass ofmt0hu qbw2ns.p-+jl+v2zi-h0pl ntt m 1n.i - 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 friction-free roagl8,xyi(h)pk d. The collision was completely inelastic and both cars quickly came to rest during the collision. lh)yxi,( 8kp gWhat 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 for a system of p+su h di-atfe1u .5pe8articles.

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 20binfe:po5yy*:so . f/ 00-kg truck traveling at 35 m/s?

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

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat 01kawd5xfl einoz4q 2 -5xfu, is moving south at 20 m/s. What is the magnitude of its momenl-0,u kzx w1n d545x ifq2eoaftum?

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 iu:xm7lw*hq u6gs 4 .ymomentum when it strikeu46 qhyw:7gu l*sxm. is 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 cars are movin/ib ne.w3ny.d-hf g j:g 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. What is the total momhfyndg/.wjb .n- e 3:ientum 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 mx+bf;ye x8 a7 qhko3s/2nh08 h7vzlds/s, strikes a wall and rebounds at 24 m/s. What is the change in q8a2o83h7fn h/ 0z7d;svlykseh x xb +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, i-mltpu :v b9o7xl3wv+sr k+x+n moe -r1rr)y0s struck by a rac1+)vruerm :+x vrrbl--pwsxy3lnoo +7mt0 k9ket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machckshcbsh05o/yh p + hkx39 +f9ine (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 hp3bskc9 x h yh0fh+hks9 5+/ocorizontal direction. What is the recoil speed of 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 y md1:( sj9ldyo)9pqaql8 k ch.6keu;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 astron lcu;9o qpkdymkq l6 1ja:y8).(s9hdeaut 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/(73yqrfkbth4;gv9 l )e spmq.ot,+m vs approaches head-on a large object at rest. The small object bounces straight back with a mom+4)br;mmy,hq.p f (gk3q estovl7 vt9entum 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 your friend (40-kg mas 1r(j5xaq;v,fvy xqvc) zq,;ss), who is standing still, with open armsq f5qv; xzxjr,)ay v ;s1q,cv(. As you collide, while holding each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 ko* futc3ty:0q us e+1wg moves to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcy1ec*o0 wtust+y 3 f:uqcle 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 travelin7f;5 kcmf bzj-g at 25 m/s runs into the rear of a stopped car that has a mass of 1500 kg anf 5; z-mfkcb7jd 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 coast s5(gc( y/qicsalong a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initiall ((ccy5 iqsg/sy 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 frict,r fior,27rdhion on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a dist ir,rhf2rdo, 7ance 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 0.80 m/s (with respect 1gqhh6q jd7 )hnq) k 4uca*eg5to the log). With what speed does the log move, with respect to the shorqu7)nge6k5qhq j*g ac41) hhde?

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 1+ zc2y,/ uw- i0tl e1z:akik7cpp0z gi5 N and acts for one more second. What impulse was imparted by these forces to the objec,/0pzk7 c- a + z :ciiiwgy1ekup0zlt2t?

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 the obje f 5.jzs9ftg+m-y/pxuct's change of velocitym g u9yfz.j-s/ x+p5tf?

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 t *dckp:2e v .k:vhv+lwhe right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the 2k+*.wpc:dvev:k v lh 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 t5hv pbh3 4*szhit the ball back along the sambp 3h*sz4 5thve path, and at the same speed. If the bat was in contact 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 to+ n)for( gb0d4l6 -nocfz:5vsbp-laap. 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 th):szf-n lvar 0 l-ocp+f6(ndb5bgo4a e 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, withxk 3 px,vdp2/f a muzzle velocity of 750 m/s, at the rate of 300 roundpv 3 fpx2x/,kds 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 ocglg;h xs g4970env 1b+/ssh jf a burning building 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, cnb 7xhgj+ /4;s 9s 01egsvlhgassuming 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 ho,fct 2 ljn /qcmr,hz/9rizontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, wha, ,qlcj2n/mr/9h zfctt 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 dov z67ra 11jjuk*ex* hb f61gfired straight up. What average thrust forcej*doej6gk 1a16* 1hub vfxr7z does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initiall vuiri8ms)8a) y at rest in outer space. They push each other apart. What is their sepa88vsi)ma ir)u ration 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 icw m b 9 1,jl:bpqw7bep6o1(sright with a speed of 2.0 m/s. It collides in a perfectly 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 col:o1j9(bc7s1m bbwpp6 ,qw e lilision?

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 direction-z3vsv, , 7;bwgn hfkz makes a head-on elastic collision with sgbvv;w hzk-7z,3, n fa 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 afn3*bncewe 3 lwe3;,d 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right l3w 3dfneb,en*;3ecwafter 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 ws,puu.j s ; b+zub)i(head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equa jwp sib b.uu(;s+)u,zls the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary ball of mao z+/)kemj ff/p g8hg4fis tex+8.h: pss 100 g. The collision is elas: )xsof +fe/h hge/t8+pmk zig8jp.f4tic. 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 towan;lt2b 2rgj -rrd the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perf2gt;rn-bl 2rjectly 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 h.spdd+e o3*tkg mass at rest. If the collision is perfectly inelastic, what is the speed of th3.o+dpd*h tsee 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 co /w/olk krf.:pllides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lostrk:o/l/.kwp f during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked statio :ucnx8zd z*tmbxau )v*2)ns(n wagon, who's mass is 2m. The bum x2 tnm(x)zuns8cb** )vdazu:pers 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 ,rog7oe /xz)w u0,x54 xjz snvm/s in a 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 upwar 4 gux0,,j)5vwo/xznzrexso 7d.
(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 7:psvwcw- epu0hwm/cdcc:/ r0;fw7 p a 3000-kg car traveling at 60.0 km/h south. Theec/:p-wwc/ c pf0p sc0r7w ;u:7mwvhd 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 amyk3ola i(9gi) u*)e km/h east collides with a 3000-kg car traveling a3l *i umgy)9(ka)o iaet 60.0 km/h south. The two cars stick 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 frictionless surface. Object A m7mq6xb)h(need-pky 2 /lig)r oves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kek eyi(x) bn-)/p2mhd r76qg lgm/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 mov15 /slnl94mwwp-7zd0fe y fjbuy 4kt *ing toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg frag z f0b-y4k/wun9 7fm dw5*1ljlt4epysment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg maoor1s.1 c 66aoi qbs4css sits at x = + 21.0 m. Where is the center of massoq1rcc41s o6bs a.i o6 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 systeq(h 1ex7rnqk m8qy.fd b(ja..m is at the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the s .bqh qd.r1.kxe(y(afm 7 jnq8econd 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 positio uk;-mg-pls- uned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, sg-pm ; u-ukl-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, 2.0 kg, and 3.0 kg, are lo*ba:c k:dmhyl;x o ix*8ncd w1:4dn7jf* 4mgucated at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the cena478 mdyc*;xjw* :u: lg*cn: n bdfkhid4xm1 oter 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), jaww/e t y).c.and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kej.ytw a .c)w/g mass which will result in the center of mass of the system of three masses being located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a whole lekfkxkvaq;+kc x0 8/3og including the foot when the leg is stretched straight out. Assume the fkx;x0a vko+8k kcq/3 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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