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

1#

What is the SI unit of momx3iu rzi.ot vgz /y*u2org:4oqu2b91entum?

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 cal/r* 1sve44 p/uqcswc nnonball, 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 railroad track at c*n- mr opvd6o f9uh.0honstant speed. The car is open on top. A large load of coal is suddenly dumped into the car. Whahd 9vm*.no0furh-o p 6t 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 fricsh gf/upyk sqc*7 3v.k/*s*bo tionless ice. What happens to t csvg.hkfb q7sk *3/o*y usp/*he 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 lump of putty have equal my1o2f ceqca02ass. 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 objectscc02ey 1a oq2f 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. Hontsdp, 7nswig;:l e-l.:q k 4ow would you represent its kinen,.oe ls 4k:q : wp-7ldsn;tigtic energy in terms of these two quantities?

A. $p^2/2m$

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

C. $mp$

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

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic energy you gave it in the previl p8m8p w2xx113afme mous pitch, the magnitude of its mow3x1pe x mmplmfa1828 mentum 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 lawazexn;hdhndmik ea vrl/x c8ol11-74 g e 25)3 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 conservatiorl l)n+eie mj*t): y/dn of momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F v4t h-mf2 nmij-av;w) qs. 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 b 8;ii26uqdd8o6vy c tan 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 witlqdd):) n+f0hwa dj9r,l5 em qh a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correc9wdqnd hl laq+:e,0m)5 d)jfrt?

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 thefjzupfgic22q1 m yodpdd/628f 805 p m other blue) are dropped 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 duringgfm q 52 i0c6 82fdzpm/fuydj8op1pd2 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, co9du-b qj xb/gf.kq ck1 vv.01jllides with a stationary bowling ball. The Ping-Pong ballxuq b-gc. 9/1db fqv1 0.jkvjk bounces back to the west, and the bowling ball moves 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 bounc,* w50tg3o5 oa lhrf63jzkjjd e 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 hxp1 jizr-- * 6wji:jznvh8 tw2ead-on with a 6.0-kg object moving to the left at 2.0 m/s. Which whp-jizzr*vn:w8ijx -2t6j 1statement 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 mow9u dmec( id)4p/- czaving at 2.0 m/s tackles head-on an 80-kg halfback runnid4/ )p ciucde 9awz-(mng
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, th9:-fzvf w4h(j f ykvcit5n;il h)nz)1 en which of the following statem i l5hv)vj1 yn9czf-(zwtfhni;4 f:)kents 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 cjfo 0ec1b+0z konserved?

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 ballkzerxw 75cwudh :,d*- and stops, while the #5 ball moves away with the same velocity as the cue ball had orig dw,h5ekz:7wc xud*r-inally. 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 wityozop:h u/ud e898/k)kfr-jih a heavy exercise ball at rest, the beach ball's speed after the collision will be, approximat/yk8hodiu /kjzpuf89e:)ro - ely,

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 collis 8bqyb a+tw*th:a 2rw02eo+ vlion with a stationary bowling ball in a friction-free environment. lbv*ote a80t+rw+ :y ah2qw2 bIf the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on elastically w.x r7v-+uhu cdith an identical ball at rest. What is the speed of the initially stopped ball after the coluh- +vu.7rdcxlision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a very light(*d /mi+hr 7 nn;6u+fvp9(r6fso i*kcwb lwq d 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 after thrfruf;q mvbn+97ikd(hw p6 +dn / **6(owlsice 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 withh/4cau4jc dvct b-y5h8+zi- l a very heavy object at rest, in a frictionless environment. The collision is almost perfectly 4c c-bhh5a4lv-tiycz+ / d8ujelastic. 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 c /fh8lv1) qjx;xylfe-a2w9fe ( mv+gi ollides head-on with a yellow ball of equal mass moving with a velocit /me19 ahqf2v(fe8); wyx+vj-il fxgly of -2.0 m/s. What is the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides head-oe8c hq1 m:nx,pn with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The he qxpmne:c,h81avy 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 of the ja on j9q0*+94i( vkkg5uyifag s7) ynfollowiny9*fkn igng)9 4jj o y(vua+ki0aq75sg statements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick0j3 rq mni+y9k together. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfec .ipis3 jh.4dtdl 8 m )0jmr5u8aebf/mtly inelamd 4p t..fb/drm808i jluisj3ae)h 5mstic collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Which obj.wpe/-z d h6od +2zk* lmbx,kmect experiences6z/xd b-p kd 2+z.h*lomem, wk the larger magnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 bnemxs:x0:1)/ k6jc 9h xuuxjy all and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following statementrw0bg;b- i-5 ns jgidb))se6ns is falseb-d)nbjirb0 g -6gsw5isen ; )?

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+nl/4xk + v4ga nqac(c 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 lonevsuoh sbo qig)4f96uh1/n8)g 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 horizontally, release llzbo/11 mjr:s a bomb, which explodes before hitting the ground. Negljo1r lm /1l:bzecting air resistance, the center of mass of 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 fri( nnl .o uo2;gjopqs)3++cxfu ction-free road. The collision was completely inelastic and both cars quickly came to 2 u. po;(n)ulgx+jo fnsc3+qo 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 for a syllg k-8j -:9d hebbne5stem 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 m/s?p9**uy/x w 0q ix.jo vddui 8dp:wp11l

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. 5:9 4l1j 6jxv nlfj7kmdeldf 0kt::)drn2wij What is the magnitude of its momentul65jt:kjw9n:l7fje4 df)2 nd:i xvml d0rk1jm?

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 momentuw8;;3rbu3rzz:kjz lp m when it strikes the grop;k wzl uz3rz38:j rb;und 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. km tyck:57o/n*-z 2tl, evocq One moves with a speed7l/ mccvk-2oo ,t*:nz yek5tq 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 m/s, strike/ gdw8dra0* 7 r.em3qmhbn xm1s a wall and rebounds at 24 m/s. What is the change in the momentumb7. gm m wx/dam*rqhd03n8re1 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 strucruj2,,bh9 x( qxoc/ jek by a racket causing it to rebound 9,ue/ (c,2 jrbjxoqhxin 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 (exc/ (ee4f2/b0gxgzs xmmluding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball wit/mmfe x gz(xs4b2 0eg/h a speed of 35 m/s in the horizontal 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 spac+n9oet5ps (qm*7 zobye98xsk ce+fbs ,7tie3e-walking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he i+z+7y 7xfe9 ek9tbsmc58 s(,b pe3oeqn ost*throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

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 2(n8mz05jmmo nl +jkd/ldn,k5.0 kgm/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momknn(mdz,n 0ljk2mmd85oj/ l + entum 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 pvy, w q*xjx6rip(*j+ m/s to greet your friend (40-kg mass), who is standing still, with open arms. r,x**w(pjq pji xvy+6 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 kg moves to the right alongc+ba ;eqpxt9c.mhp ts96m,bc *ei o(3 a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. st accc bp;h .eqx*m,o b(e39t6ipm9+ 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 runs into the rear of a stopped car txjoun a.(nx+nhq.jl3g ykf./9* tee1 hat has a mass of 1500 kg and they stick together. What is the speed of the cars j/.yxlg1j ux9. n foh+qee.an(3 t n*kafter 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 along a level track sdv nwit*))oaat e 78px ke:.6at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at )t ietsd):.8ka a wx pnove6*7rest 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 negligibg5ts- apvx*f16wjvbh: tg : yk l,f-e)5-qj xmle 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.se) ,gf6yv -lb1-jm-waqt tg *xkj5p: 5v: fxh 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)e6pi*w7w3 n .h xcfe- 6ntisb 100-kg log at the rate of 0.80 m/s (with respect to the log). With what speed does the log move, with respect to the shore?n pi*7).w hb66 n xew-c3ifets

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 un ) kofkqv5 wj30tk6 + osu-huaf9o73on an object. The force suddenly increases to 15 N and acts for one mohkautfu9 f)nq3o-k ou3 056wj7ks+ vore second. What impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6.0-kg object. What is the obj qf9/shvx*o xp);8jyz ect'hzpvyo 8*x; x/q )sj9fs change of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30n8vppv8+1j h3+jrqkma- qhi w.5vp o5 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the ave3wmk -j pn1jqhqa5h.v r8v58po+ ipv+rage 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 pib5 x g,e 9nv0jr2,;sojn8gl( dc+xnwitched to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force thox 98n,,(ndlj2wgsi gnjrv e x0c;b 5+e 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 speedk j2kd kx9)f7gs of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force 9fd)k72x gj kkexerted 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-g yz*-r:igcx4 xram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rog:ixryzx- 4*c unds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burns fnw; qh (;p5/ljh0 ud*s:syming 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 neednq5*sh;w/jsl0 ;sh(dy uf m:ped, 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 horizon2yua89r. b*-bh ewrs 0yeic4d tal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what aved re8yb 9swi02u*er4ayh c.b-rage 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..(t jt4fv-l-lb/aivl7ip: ms0 s, when fired straight up. What average thrust force does the rocket ent t-/mfsapilv4-.b( il7v:j lgine 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 i*.sq:c/ / :var mjmiafnitially at rest in outer space. They push eaca mr:*sm/a: vq/ ficj.h other apart. What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves 9/;fqo ohk5m3nc. lhbto the right 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 collbc/ q;mko 59olfh3.hnision?

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 ont61qq)o ho4in 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)tqhnoq 4o 6o1 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 1reiq6sqj0 w: -n45a jo.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 velo a40e :r6 jjwqis5on-qcity 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 bmtdl .00hm 4wwy an alpha-particle (which consists of 2 protons and 2 neutrons) th40d.m mwlw0 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 y5c6 hlc(n:)z2cj cc8tm1lpx3 5p vram/s collides head-on with a stationary ball of mass 100 g. The cvpy (lhtjcx3)c5l 2cr1z6c npa:m58collision 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 ypty0 v w/ly1,east with a speed of 3.70 m/s collides head-on with ay t0/l, w1yvyp 200 g ball sitting at rest. The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on with a k eka2lq(g *1 is(dc ),7srkuxz)2 lav3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collisioi)) l esv2kkk dg7ur2sxa(ca(ql1, *zn?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides head-on in a./ l- - pn.5yex-xb6ueao qvtn perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy v.l-n /txo5-n .6pqeb aye x-uis 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 parddx w)ov86x33d s( z0*vmbjztked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the ivt *d6(zxbxv38z)0d wsm d 3jonitial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction buries itself in a 2.4-erv 8,t9wa*+tjx+ rud7msae4h t;lq.kg blockwr8u4+7x aeteqv d*la ,;+.mhj9 s ttr of wood a rest directly above it. As a result, the bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

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 yz.s,egj9kpe/;, tlf 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See , z et/ekfp.;lgs ,yj9Fig. 7-1.) What is the speed of the cars after collision?

本题所包含的其它图片:

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 yy *v 8tcy0ic+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 direction ofvyc8 it0y+yc * 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 / b5/ kgth4g;rxtr8iumoves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is5 rr4ti t gh//8xkugb; the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a d:7x0ol 39 db hv,oicdvelocity 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 ed3c:9li v, 70bdhooxd ast 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 = + 21.0 m. W6fd 0z 1rkbm6mhere is themmb6 f1d0k6 rz center of mass on the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a tw7xjg7p :.cn 23k/hhg gdv+x; bss u0xvo-particle system is at the origin. One particle is located a.:j0/d+xuh pvck sxg7g ;3h2vnsb7xgt (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 positipd,h -is ; se2iy-ax8fde-:vfoned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), ahsp-fi:fi,a;8 2 dxsd vee --ynd 4.0 kg 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, 2.0 kg, and 3.0 kg, ar1 izu0h5d2nqlnh,f :n3sk4yo ro* g y,e located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2hlf1k 2z oq,ohy:y,354ni0dsgn*u n r.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 positione.w m z5w*n1dktd at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg matk1z. w dm*5wnss 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 leg including thf;+ty+dmu)yu, oizbs ,o5it; +jw3ghe foot when the leg is stretched strai++ugmy dis;+,wjuohz5i,ytbf3 t );o ght out. Assume 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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