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

1#

What is the SI unit of mol y(h4x.um8+ijevgs ) mentum?

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, thew( pbk*6 cdi.k 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 friction( v/htbv;/dqb y(zy7sjy 4 um*less level railroad track at constant speed. The car is open on top. A large load of coal is sud jv/q4vhb(tm;yb7z ysduy(/* denly 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 wht gtq(r g mx086slh60mile sledding on frictionless ice. What happens to th gx0g( qtr0686tsmmlhe velocity of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a l0v 7qfxl;jlkfq.;.z47 szgz nc bd.h4ump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum cz ..47z;ljsk7bfcvfnq4.lhdx z 0;gq hange?

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 represent itsno ey mv0k+:,c zvjb,- kine:m -bnv,jkyoe v, c0+ztic 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 winh9c;*c6a . xlnvrw w.th twice the kinetic energy you gave it in the previous pitch, thenx. wwn vhar *c.96lc; 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 ti xk;avc,m q)/+t *nr9nvhdm/erms 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 momentvtsik:e ,yi9g(3x l k8um.

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 curv0lt4x9e mhw + 6j33gu1 qkchrde 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 an accurz7n 2pzxm9.bo. tv 0xgek 8k-)bz1mcs ate 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 collisio vispe.8: rqe.n. Which of the following statements co:ipev.8rqe. s ncerning 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))d0q *rbtne*tgie gl0x hq; 99 are dropped from the same height, and rebound off the floor. The red ball rebounds to a he9t ;eb xgt *nhg*)0iqq9lr0digher 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 te.*da.sd/nu is5a73zx byp)a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly txiz.7). d n *tasdey bp3sau5/o 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 bounce ofdsw1xqkg+.w (b m c,4yh0g k,hii7e)n f 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. k- 60hg )uvrzzz)rvj(f rj4;f It collides head-on with a 6.0-kg object moving to t h(4vzzu6r j)rfv fkj z)-gr0;he 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 hedqww ;6zf0a0 vad-on an 80-kg halfbackwwaz;600dfq v running
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 conserlprb4 3g(qn+y m; ,lv7rag3l pved, then which of the following statements is true aborp,al(4 gn v;g l3pb7q3ry ml+ut 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 conservpk5mw;b1 t0 lzym7 x. f+q.gcobw +:hjed?

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 h:y n;, .moqqa(vxtpe 0its the #5 ball and stops, while the #5 ball moves away with the s qexvnqt;.my0o(p: a, ame 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 collides withi( 6w,pi,.e1c:. ldp o:ofe/thz p. c2 dubvbf a heavy exercise ball at rest, the h.wi::po fec (u. /1.tp dl b2f6ivp,,debozc 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.cxwh9t,v rx-0cm :a q in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately aftexc9m:.rawxqtc, 0-v hr 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 hni9 pidj c0+(wu0 pj1k/-tfjuead-on elastically with an identical ball at rest. What is the speed of the initially st0n1ift (uj9 /d c0-wkjup ip+jopped 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 al4f 98k2 tmb;/gzmaf7 f-xo dp very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down a 79fpokx; d4zm8fbf/-gmlt2. 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 objej ;n/c7 w3by+kd/gcv u h0fk3kct at rest, in nb /gc0/uwky+kf;hcv j 3d3 k7a frictionless environment. The collision is almost perfectly 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 vwoe 7-zzwwp6j ;2j v3of +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 colpwjz 67wv-wjvo;2 3zelision?

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 velocie*topu3qq n.)-8ioh 1uqm u,r ty v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barq uh.roqoeti3u-1 , p8qn um)*ely 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 whichretzdu ;4:prgu,olu/ 8dvrgwqr )/h *(1q1se of the following statements is true about dp)vsruugr o/8q1*:1(z;lw h erdg 4qert, /u kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. fgj g/dxghy b9n15 *+y6u inh2 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 5h;of dfup0ka/* v y-iat 4.0 m/s. It collides in a perfectly inelastic c-i*f;fo 0uavyp d/k5hollision 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 +zl(ts;lurz3jh( oa sml afy.+; 4 )sqand sticks. Which object experiences the larger magnitude of momentuouas+ h 3 f ;4za)mls+ sytlrq.j(l;z(m 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)fr0v2 zfct :p(8u 7jcn ioub3s 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 a+pus;:)v llbi nd m. Which of the following statements is falseslv u pl+;):bi?

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 falha8p wwd94d9z se 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 o9it01wrion5 g rder 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 before n8v.f ofr*j3wt7go7shitting the ground. Neglecting air resistance, the center of mass of trof37 vsw j 7*8tong.fhe 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 rog 74hu;x mkh:pad. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system'u;hk:mgx7h p 4s 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 pw -(10xonhf7qk7dlpbp j. , nlarticles.

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 truck9m+ *b eq kqo+vbb9g6m 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 the magnitude of its moj:k z4c7 s)e/jjgmj7gmek7c):jmze/ gj4s g j7jntum?

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 when it s pf 0q fklgw1fn:v,8,0dciujyh.5oj3trikes the gr:vf8ju ,pygn f 0kq0wjhi,3l .1o5 dcfound is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to each other. Omu-2u 8)v md)*kr ufzone moves with )8-omfzm*ud) r 2ku vua 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 3j,lhxjnkv+j +g k:(d:0 m/s, strikes a wall and rebou:d(x,: kjgjn+ jvl+kh nds at 24 m/s. What 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 moving at a speed of 12 m/s, is struck by d ;j()*kdj1a/;fvj l kylj6nf a racket causing it to re ydv alfj;6 ;n(1)jfj*k/djklbound 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 machine (excluding the baseball) is placed on a frozen pond. T 2h+ wawyoiadnkp7:,0he 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 pitchingoka0w7p2n, y +:dawhi 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.3u g/v aifsq.,3qly t0bdd,j the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2./ v3iustd, 0fag .qb .q3yjld,0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

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 approaches head-on a large ou0)uvaw2 ery1bject at rest. The small object bounces straight back with a ywurevu0a) 21momentum 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 (403 pdvo2,x8/vriaw. sy -kg mass), who is standing still, with open arms. As you collide v23apdw.rsyi8x,v/o , 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 a levu ))l fkhb0ur v+v / -7i(jqa,fqvnh*lel, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. Wha0 flnf 7kbvh ij, la)-q(ruv/uhqv)+*t is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear of a stopped car that has1c9sd, f8am;/co, hb,ah5nvaubx- kw a mass of 1500 kg and they stick together. What is the speed 9 a,h cx5aw hfs/buc,-a v odb8;mn,1kof 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 tdzgt g4mm1w )-xqsr1v.w2o6 ,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg sectxoz4g-smt qm2r)6wd v.gw 11ond 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 wit:kf5 y0sw-0 8nebtilph negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance y s-lf5w i8bnt:0ke0pof 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 rativ8-o r52 wysn+q:zsu rsn qj7k6 *vu8e of 0.80 m/s (with respect to the log). With what speed does the log move, with respect vsq-wu:sz8 8oriu2n5qr+sv76y j k*n 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 objectym9a/fjyug g e2 p/4)n. The force suddenly increases to 15 N and acts for one more second. What i 2/)gey9pmu/y agjfn4 mpulse 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 a.4jg+-)ov k berl+lp hcts for 2.0 s on a 6.0-kg object. What is the object's change of ve.poje+ +r-lhvlb kg4)locity?

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 dqt78ooz7fc 9a brick wall and comes to rest in 0.20 s. What is th987tz7 oqcfo de 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 hi *xwwgfse+t.e+q, *hft the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, wha se.h* f+qgeww+t,*x ft 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. The speeds of the ball rightwn54ui 6t8zm o before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. 4t8mon5zwi u 6 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-shgcl hl2ln-.5l*+ hagram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute.*hcsa gl5lllh.h -+n2 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 ;w iaw:e.+bmpon the door of 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, assuming the water doesn't bounce b:webiw+.pm a; ack?

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 horizontalo cf g/h/olnpvo 2w84sb20 8ej drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't spl8o s0g/2nocvpb/ oew4hf28lj ash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/s after 3.0 s, whf3mnwj2;d0dui;*xii en fired stri ;d03i; wn2fxmji*udaight up. What average thrust force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at redi 5g3;xy:c,y m ccsb2st in outer space. They push each other apart. What is their separation after the lighter astronaut hascbsc3gmy, :5x2 cy di; 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 ,9s5 / t4ijrjae bfs9s:v5b njspeed of 2.0 m/s. It collides in a perfectly elastic collision with a/se55bbjsf9 rs v, : tjain9j4 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity oo/z1w b;/;nor no 6vnlf 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg objec/nl;or nonv ;o 1/6bwzt 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 vk( u27qwuce (x,ag2mat rest. The bullet emerges (the bullet does not get embedded in the block) with half oq7 ma ue2(gw2 (vu,kxcf 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, zm-mbi7g q0wb s ;f9)vat rest, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutronqsbm9f - i70v)bgmwz;s) 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 stationary ball of mass jsql7t s5w r qm.5xjrwz/;me : w*(cp0100 g. Thmrm/qj5c rwsew lx; 7.:s(w*jtz0 5pq e collision is elastic. What is the speed of each ball immediately after the collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.6uufx-kr u* y5h2cg/9xivfu, v0bt 8 w70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfectly 6g5y-wuf/ u*,k i tv2brxuu9hcv8f0 xelastic.
(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 head8rjutbm09qg4)p b tz*0xz 0hh-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of thet48 m*zhh0qz0 tr)ug0jxpbb9 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 headj0p-glunr 0 6y-on in a perfectly inelastic collision with a stationary 2.0-j-0ug 6lyrn0p kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station weqq jp( )0bjdfuzq-.n.8;sdiagon, who's mass is 2m. The bumpers lock together in this izj0q fj.(8d.p-;) qqsdubne 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 travelinp8,z/-m rjr zrgy*hz) g 213 m/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 mr,r zpmg8 zrz-/*)jyh oves 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 3000-kg car travelingvt* 9mccdlj8- 9 p2wuk6k 0sfu at 60.0 km/h south. The two cars stick together after the collision. (See-s pc0j m*lf998t u 6kcudvk2w Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-kg car traveliub1w zej2(.dk:aw xc *7rgwb8d3 a*nung at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of 2wb*cn *wrjeax.ud 7u (z31wa gkdb:8the 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. Objezvul8it8qh ae:q: s2lawf-j4; kz/(qct A moves east with a momentum of 24 kgm/s. Object B moves north weqs 4j /fql:iha2tq ;w8kzvz-a (lu :8ith 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 wit93y7, piz dqrnh a velocity of 4.0 m/s. It explodes into three fragments: a 59pqnz ry3, i7d.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sits at x = fs- -.9p 7jkg5rqeqrb + 21.0 m. Where is the center of mass e r f-krqj g5.s9b7-qpon 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 orl(zy9cml. 2mei0:k kkt ,hcn q53t8xm igin. One particle is lt.mkm3n kc,5(lmt hc2l:qe zki90 y 8xocated at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as for k dc5men:y do3h/:9ullows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the cen 3 hok/n e:cudyd5:r9mter 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. jzud23ny4ik: v ;no:af3zf 0s0 kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the lz;v n:ozdi 3 3jn:2afu40ks fyocation 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 is positioned at1 b,tkcnnh8( i (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses beinhn(,b 8ktc i1ng 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 in;+9z gl0ng7g4 ko:. fawrsltpcluding the foot when thtgzw:; 7l.g+gpa9r4k flso0n e leg is stretched straight out. Assume the person is 1.60 m tall.

本题所包含的其它图片:

A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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