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

1#

What is the SI unit of momentii a2gwq 4kqpvf36j:a ss7 )e/um?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball, the cannon will recoil backward becau5fofbvt + 7w4,-ypq ,r l0dubvse 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 lzbdma2.4jo qf-a pp 3fh7 4*lconstant speed. The car is op44fp o2 *a7ahlbzjd. - mfpl3qen on top. A large load of coal 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 sm v1x0he n/5-h)lbuq yh02hexled while sledding on frictionless ice. What happe) h5v0qhnh10/lbxm ey-2 huxens to the 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 mass. They are thrown with equai ndms92 lf2i(l speed against a wall. The ball bounces back with nearlyi l92d( fs2nmi the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is mov8 yj4wf9is f+tcx(lm;p* a-e aing with a momentum p. How would you represent its kinetic energy in terms of these two quantitiees+caiw 9f y4mfx(l- t*a;p 8js?

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*q-(u7bm m myf2 tn9fn the previous pitch, thenmn mt9-qm2 fb 7(f*yu 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 lawhr4,g mo5 na,w 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 mom6fs gtn/a+r4m: ydr3rentum.

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) graph represen6 7 znt punj. -fy+i6g9tvsrr-ts

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 statement5xbd f b8 szke osiu.:2u;s77m?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collision. Which z(xv/kfnx g ;7 )fj5dcof the following statements concerning the magnitude of the averagefnk5xfv x/j)c7( ;gd z 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)dp zwto ww584::ec-f84zeo dw are dropped from the same height, and repwwdzf8 :w5 8wt-d 4o o4e:czebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

A. It's impossible to tell since the time intervals and forces are unknown.

B. Both balls were subjected to the same magnitude impulse.

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a spe +8gyj m0n-7tguo /liled of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves vlg7o8jgmuiln+ t0-/y ery 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 andq ;)g yaqy:p8x bounce 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. Itsjup y/.p-5jp collides head-on with a 6.0-kg object moving to the left yp-ps j/uj.p5 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 l1utqd:udc5lzl 0.t lz7+rw. 2.0 m/s tackles head-on an 80-kg halfback runniu 5u+l7l dwczdtl .0r:qt 1lz.ng
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, then which of the fo1h9 qkvp6(.( btrx67gakjog9h ,eu qlllowing statements is true about kinetic en(( ugbh o6t6x9pj .kvqa,1 eqg79rhlkergy?

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 conserv lf*7w .cxp(yked?

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 the61o4v40b fq5u 1 r(cxqxnxem 8ea-a cv #5 ball and stops, while the #5 ball moves away with the same velocity as the cue rnqo4af v5a86e xuc4x1-(1exbq v c0m 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 speedst/zzpjn)e s+4-z ts,dx + 9mo4kt :bo of 6.0 m/s collides with a heavy exercise ball at rest, them j eox9s/td++n,t kzzsspb4) -:zot4 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 i; n1dobj/ ,q c6+.b,lntbvpz,izau*right collides in a head-on collision with a stationary bowling ball in ap/bdv6ubib1;c* t, ijo.zz,, nna+ql friction-free environment. If 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 he 7g7))kcfyeem wh+knm- ,fn3sad-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the collisio)- n3m7fe) y cef,+ wsgnh7kmkn?

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 moviva yx1y:n3-2 hix+smhoc-bl8 (ujf7 7ds,e tn ng with speed v collides head-on with a very light object at rest. The collision is elastic, a-18my(+7 -jbtv2y 3,xlsi7s:ahfnxd n uh eocnd there is no friction. 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 very heavy objewvbvffus e* o. - k-srt -b+crogen:/ 42)caf9ct at rest, in a frictionless environment. The collision is almost pe-ocfrwf+coe/gs2fbe a- n-.v t )rs4:vbu k9*rfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s collides head-on with a yellow balojvpy)cv qap 25syc dk76h7 b 3b*qe6 -z;4sjll of equal mass moving with a velocity of -2.0 m/s.k;vzq )j -ep* p67c b376c2hd bovl4a5 ysjsyq 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 veloci mo;y x nw nd 6(/xce5ts*v h,c/z:oiznw*s8.gty v collides head-on with a very light object moving with velocity -v. The collision is elastic, and /e;*x5wv .:sohcm*,n xo(s y6dz/z ntwi n gc8there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, ifpc w4s84(d7-4/xnwh l lds ktt the momentum is conserved, then which of the following s4wws4l7d - 84s nct/(xdkhplttatements 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*zkrj xob +6t;2rcf9d stick 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 dyte6) a6 e5m3+bhhcvu;mms7pl1 1ppright at 4.0 m/s. It collides in a perfectly inelastic )mey1hpe m+;1bavc6ps5duh7pm t6 3lcollision 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 lp cxuw9km +38 zaamg 9c6ec6z.arge object and sticks. Which object experiences the larger magnitude of momentum c+ecp x9.z m8accu39a66gk mzwhange?

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 is deflec kox-, th5ct2mted 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.aw ria30.bhyt,a 2u q2 Which of the following statements is falsr . ai 2a2uawth0qy,b3e?

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 6tm/1dd ec+vukaf+ 4cis 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 wibvb-7f8mesw. *-i(m. m hmkolst1m6 ith a long 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, releases a bomb, wahc56awqqu/;o ylfwk35g*., d t7osohich explodes before hitting the ground. Neglecting air resistance, the cy w*wk6, su/fhdq3ag;l oo5t75. acoqenter 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 friction-free road. Tdwg9 ;er61hp she collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocit1desg6;9r p hwy 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 particles kc(3 ir6hwwn6.

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 3+2s khuczyw0(v 24stu*o0xb x5 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 o jpco:;:zdx ,u8qgqq+vb b+v;f its momentuvq;q cgb:d8+xu:ovjqbp z+,;m?

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 hei/v2 wlb.uar6,iuaeb7 ght of 12 m. Its momentum when it strikes the gra wu.lv7u 2ab6br,ei/ound 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. One moa ,7 nlzk,olw/ lp.9shves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is tw7nlok,/ap .l h z,9slhe 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, q2 7dtp)n/a3mqs(e+l ht1pkz strikes a wall and rebounds at 24 m/s. What is the change in the momentum of the ball?ptzd)q(e1h 2tnak/q pm3s+l7

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 spee1alyrs+c9qb e os, *a/d of 12 m/s, is struck by a racket causing it to rebound in the oppoeaqsb/s a1r,lo9+ cy* site 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 (excludi q cig1ty r:bn)+c8)waa (9qnyng the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 qy1r+9( n aa q:) ctc8ngwbiy)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 space-walking.2 6iss)gi rha outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does ra62)gis ih.s 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 .glgp,u, *u mbd(e8a635o,g chgr mmh5.0 kgm/s approaches head-on a large object at rest. The small object bounces stra38obg ma(udgc hulm ,6p ,ge.5m r*gh,ight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg ma;en8z7. 3kwojm7sl qjss), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both move off togethkns7jml z3ow.;7je8 qer?

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 level, straight roadl zt/)uk8gr(n- e+vnw at a speed of 6.0 m e)k+ 8tnn/ wz(ulr-gv/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs 10 l q6a/hlfg5qbue00s5g o,xe/kbvw into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed ofkb05l e0ge,o15 xaw6/uqs0 f gl qbv/h 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 along a lej d(ve8s0 e8mmvel track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupd (8smv0j8 meeling?

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 negliy;;sh():olffl + co/7 s lmonagible friction on a horizontal tracs (o /:)o+a7lh;s fcolmlynf;k with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be 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 rdoxr44yx- kqt o/fn g)8, l:ygate of 0.80 m/s (with respect to the log). With what speex:o-ndt) 4qgo,g r8fkyx /y4ld does the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The)weymb 6 kzdjhg.48w+ yot.o+ d4hc99uxp, to force suddenly increases to 15 N and acts fo)wdyg94m zj,hoch9 +teo o6.8y pkx 4w.tdub+r one more 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 s2*lhsf60 nw ytp*/tza (k8+gx m 8ycii on a 6.0-kg object. What is the objec(akgl/fn68c i* w* zti+mspty y0x2h8t's 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, travelingd;/2vv rjpc+j db9sf4 to the right at 30 m/s, collides with a brick wall and comes to rest+p4 2/; fcjvrbjdsv9 d in 0.20 s. What is the average force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back along t6xp:3 rs*u2l i-oho lghe same path, and at the same speed. If the bat was in contact witp6u:o3glxos* 2rl- ih h 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 droppe3zz4efwjbj 1 ;d onto a table top. 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 the collision between the ball and the table top lasts 0.15 s, zbw 4ej1jz;3f 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.fbcb59+cu *vzgtyv4 )0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exertedcz 9bcf*gby4+ uv)vt5 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 th 72wirrond88kgb 5an7dk+z y;e 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 ofdk8ko 7+r;zar5 b2 dn ngyi87w the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horiz6cy+ee++x4 ,j fmzwfs ontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assu6,x jfse4y++c +fwz emming the water doesn't splash 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, kua720t9u5/hcf g; m ;gbrufjwhen fired straight up. What average thrust force doesakug9/u ; 2tb0; 5rg7hfjucfm 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 mai)n ifsc/-i e5sses 60 kg and 80 kg, are initially at rest in outer space. They push each other apart. What is their separation after the lighter astronaut -inci/)fie5 shas moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a speed of 2.0 m 96: bf0 mtivlwnhzu p+zpu(.+/s. It collides in a perf9l:pp w+ fu ntbi6v. uh+z0(mzectly 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 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 witv)) bqwju)9 jew i/(kch a velocity of 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 object after coll/)jw(v 9equk) w)jb icision?

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 atk:32g t,ab cyf 300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half yc:g3fb,t2ak of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an alphl ;. hjai; d croj+kj7g.e:qy1a-particle (which consists of a +:ej;rok ;hl.j1c jy7.gid q2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s colli4d- lhsh/( ;uar*d m+hp uy7kddes head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball im udd-k 7+r m/hlay; d4(*shhpumediately after the collision?

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

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

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

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

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.70 m/s : vjy dmv3i1o1 ebc(5mcollides head-on with a v 1jv(mmy b1dc35eo:i200 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 1xk2v4jl,f cc 7dwuo22mw67 wgqrn-k with a 3.0 kg mass at rest. If the collisiwmwq v 7krwcxn24g17 u ,kljc22-f do6on is perfectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides hea.el0ltxhta ,2vb5t( g d-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energyex(,a0v.lt2hl tbtg5 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 sta 6j6wmol hk r-xedn+8.tion wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic coll6wl-jhor dexk 8 n.6m+ision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a ve3 /av7 bx7ax5btv/2ws / ( i4ghuawfrnm;slz2rtical direction buries itself in a 2.4-kg block of wood a re /7;vx4n/v5zib s3(s aru ww/tfh7 abl2m 2xgast 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 ea3bq1khuu z +8bst collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision.qb3+1zu buh8 k (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 90.0m( kexwzdqo :m 930wt* km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of mokmqe 3(9wzd:0mx tw*otion 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 frictionljk++3uy oxq s;ess surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastisk+ 3+qoxj y;uc collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a velocity of 4br*l(tzpm0 ru c /f2t-.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a sp2pfm-b( *tc/lr zu0rt eed 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 masd, k9 eyd .punbu6wd*i;0eq-zgz;(mbs sits at x = + 21.0 m. Where is the center of mass izgb nwukemdd*(b9e0z y;dp, u6 -. ;qon the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a two-particle system is at the origin. One 5cg5u5o4: 4tgpsto. l 8jwfcpparticle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3. 8cs4p5up5ctoo.w4gjt 5:fl g 0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0) vq+:*c -s( ptzj4jajn, and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of masjn* pjtvac:+szq4 j (-s.

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 k(nvm7v2i(u6;ch *jwky)p xv, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectivu jpy7 x2;k*i kcvvmhn6 w)v((ely. 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 positionc:pyr*n .q/naed at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What pqrynn: /* .caare the coordinates of a 4.0-kg 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 leg inc r7n:rjnocr 4982 fhlxluding the foot when the leg is sr 8 2l4fjcx9: rnornh7tretched 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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