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

1#

What is the SI unit of momonge t04)a +l7 z/yhnaentum?

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 bekbo1v id3xsczmn4tgj ;1+ ) - :ty1d6be .nnmqcause 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 frictq(gz y d mpgag+ w6jn pwdw66uu,*89b-ionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What 66bzmapgdu9 wn gg(qwdp8-,yu j6*+w 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 ,ky*or p9( wlhfrictionless ice. What happens to the velocity h kyplw ro,9(*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 s i +;oit.*qathave equal mass. They are thrown with equal speed agains t +ioa*q;.stit 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 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 p1r0xg bf3x+wq. How would you represent its kinetic energy in terms3xrg+f01w q bx 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 previ 2gfve+fk3 eu6ous pitckfe 2+ vg6e3fuh, the 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 lawffl5a;h ,,oil 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 cons)tqo x;k *u:porc)2vr5b g;f*w kb, tuervation 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 vs. t) grpvf(sbhi*-1 nj +dco d*k/w 9 b9;slecaph 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 ac;fw:p:k kdmj4curate 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 ink 1vfmpur ;usi;1y,,k a head-on collision. Which of the following statements concerning the magnitude of the average collisk ;f,ps,r vuiu1k;y1mion 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)+s7chb*h 0 w4 eh2jpyh are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball ish 7yj*spc2h+0e bhhw4 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 w5diz b bhf)ygramru-332;s 8at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly tofgsh385ydbmrb 2z3i);uw ra - 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 off each other. Linear a y/gasmdt5(6 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,,dbmn s.2 lpd/s. It collides head-on with a 6.0-kg object moving tons.mbdpd ,2,l the left at 2.0 m/s. Which statement is correct?

A. The total momentum both before and after the collision is 24 kgm/s.

B. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

C. The total momentum both before and after the collision is zero.

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker wuqdxw,t:m 6*moving at 2.0 m/s tackles head-on an 80-kg halfback rtw,d xu w*m6q:unning
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 ioks q4) ne5fm/2 h0oq(m3vrkthe momentum is conserved, then which of the following s0/o5qm)f vemnqh s3ko4kr2i(tatements 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 consern 9 ifusv; :w.zq*kq2lved?

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 wrv kktm331 .wg 4xngew0r l)3nxlbq 4)hite cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball )r3 gv 31w 4nqkw)lxrl3 gknx0bt4.emhad 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 sp(jap h0sr/a-+lw5cb/ gamr 0j eed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision wila0acw- h/(pmj j+lbr5/0g sral be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in a head-onbd5po 73sy v /qqt,i913 escjw collision with a stationaqp 9s3oe7w sdy q 13jt/v5bi,cry bowling ball in a 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 ofx mtyt3 9,g4/tamg d+w 5.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of th dmt,9gaytm+/34xwt ge initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a very light ob87) / be5kh awmjs;gz-yh d(pbject at rest. The collision is elastic, and tmapgy( s8zwh/)eh7 5; -dbbkjhere 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 usy 8),w cgcq ekue(r*f, +roqe, n1)vv collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collisions* uqy geeuoqc, vr)kcn(r w18)f,,e+ 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 velocfaiv2 o+b,0p l6qeb ynmww+il v:5n85ity of +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 w,ynmwlqp:05il veb5v6 nif a+ b2o+8 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 vq;eudh.zszs, a y520o collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed sz;e .0 2syqoa,5duhzof 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 the7b3gkmgfta1p f0t/vb ,ko3w 4. pe w)z following statements is true about kinetic energy?1)3bmtgev k 0pb3 pwo7/,f k4t.gwzfa

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 toget;viogarfvlbm (/0;n ;y1 2edsher. 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 m3..tv hjpo9dt /s. It collides in a perfectly inelastic col.optd 93.vthjlision 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 ol oc5+2ql yjz hb:zf3k:xh::abject and sticks. Which object experiences the larger magnitude of momentum change?lf:cx :k5 o:zl +hbzjh:2aqy 3

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 sk* (u b3fnow z6-c-s3 gjhki9cue ball hits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of tgvwf: b7z9bg i3lbmk(s ls79:ty gu2 8he following statements is falsbvs:fig9s7kultbgybg3:9 wm l 8z7 2 (e?

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 statem+hl xabu, 3al0ent?

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 llnx4r ;kj5vi ,ong 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, which exhwk 4gstt +jb3:jy3- g/ cz9caplodes before hitting the ground. Neglecting air resistance, the center of mass of the bo-4:gt9/ hjy3 wbsa+ztcj3 gk cmb 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-onsb;)j o:gzmkyeeykr 56g)valk-/,e ; on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's centery,5;e)ogv:b z6) emkl/gyekj sa-k ; r 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 pe+if.6 c7n76pusrqs6t bk+e9ef uef5articles.

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 e5mai; r+ 3jcua 2000-kg truck traveling at 35 m/s?

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

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moz43z 8j)glmew : aj/9oxveen0ving south at 20 m/s. What is the magnitude of its momentumea)v0zweoj x9e8/: 4ljmg 3 zn?

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 heigs jcsvkj3+ 8e-ht of 12 m. Its momentum when it strikes ths 8vjjc ks3-e+e ground is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cajk;; l,w0gbdgc s2ua6rs are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the tojukd as2;c0g ;b6,gwltal 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, travelinq mtk1r jr)(v;g horizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentumr(1; rjt)v qkm 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, initis,w/s:(q1g3gr a 8 nzvghx cd0ally moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in zxgd 0vn1w(8s /gqrghc s :a,3momentum 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 )d jz1 zrmt,w7placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal directi,) tj17 mzdrzwon. 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-walkins.z2jy igs xgn8/h8l /g 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 spex. 2/sy ilgs/gz8n 8jhed 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 hea i0y (s on:j7cake8mqdr :9q b5nu7)lcd-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 ofi7c ykn9brmn0 7l8:()j5qcs eauqo d: 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-kgd8t nqx .ng62py- vdp*8:*hdfqy,wsx mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do yo*6xg n .8 *pd2,vny8tq xw-spd dh:fqyu 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 level, straight road i u:u+p3 p(q+oopa u9kat a speed of 6.0 m/s. It collides diq3 uuuo( pai p+ko+9:prectly 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 in-drlp pi (23s phoh:3tqzz4s ; pn7r7jto the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the - :7 (qzh2pl3srsjr3tpz4i;d o 7 pphnspeed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is a s(ky ju5vpy 7aac *3qe;,;u o,oifxa9zh3f8hllowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at r3 i*8f oo5fv ukxh3(p yauc9 7s,aq;,zejhy a;est 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 ad;z 0xxqdni w6; ,34mj/t knkkg, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be m0z xxtnk;j;nwm / 3q6id4a,kdoving 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-k8ac(x:qlo4msdfzl1agxtw8 m; 8 - u; vg 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 slzq -g vamx 8 4;tcu1awf88o (:;dxslmhore?

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 obj3w4dbqxzrdcsca486 2ect. The force suddenly increases to 15 N and acts for one more second. What imc 2x 4rds43 baw68cdqzpulse 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 2(szyfbq9 c/eft 2qf(xcx4/c7a 1r pk*bm* dmobject. What is the object's change of velocity?af2 /ex4qf7*d f 21k psm(cxzqb c9(tmb*cyr/

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, travele leo:5 nf04jzing to the right at 30 m/s, collides with a brick wall and coml oj:e4 n0f5zees to rest 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 h: xk in77w,fc; )hdcusit the ball back along the same path, and at the same speed. If the bat was in contact with the ball fodi;7k):u xf ,cchsw7 nr 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speedx8xlq90t7 aip s 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 las7l80xqi9 t xapts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, withyz y0icxvr;-16c poa+ a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the machinecpz ;+iyoyra0 -xv6 c1 gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building(yz2*.bwvvdvlb8b * p in order to knock the door down. This requires a force of 1000 N. If the hose delivv*zb2vwpd8 by bv.l(* ers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal dr;zeko 6*c7wjk p1v4)wjq k3a painpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming thp74k v*kz6jqcwk ); jo p3we1ae 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 nmp /2bo+ g gj9nx ;v gvzn*3px8,vh7s3.0 s, when fired straight up. What average thrust forcp/x 32b+hsxv gv,j og9 7n8mgv z*n;pne 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 rest in outer spakj2tqrx+fd k8 4n1.thce. They push each other apafktd+4 x2 jrq1nh8tk.rt. What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right o 0nyyq+ *h8iowith 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 collisionn8o + *0yoyqih?

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 3wm3: ubob +zb0.20 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 collisionm3uw +ozb 3bb:?

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 wy0m1n e vg u09j(1uxajt +h4pp2g3cf300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embed w+1t9 ep g0vu0xh(uj jmy3g41cpnf2aded in the block) with half 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 restcvoi0 y 4(gw*f, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-pawf*4 v0oyi( gcrticle 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 coli/dj cf de6 ) jhwid2ee (4erb*39s uz;l/fl*ylides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after the )(dce9hldr f l/ 3yeji zw*6/ebd4ieuf2s j*;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 collides heu6tc2v;ept,. qj+rn gad-on with a 200 g ball sitting at rest. The collision is perfectly elastic62v q ,c+rgp;tt j.nue.
(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 m9 ki9gxa+ cofz pt5t1:/s. It collides head-on with a 3.0 kg mass at rest. If the collision o+a5c f91z9x pittkg: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 head-ous m0a(zmujj7 nngy()9bl1 h, n in a perfectly inelastic collision with a stationary 2.0-kgsjjm ,l9n( m7hz nuay(u0g1b) 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 wagon, -wy9p vt7d7n f0f5hha who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What tf0aw -hd p5v77yfnh9fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical dir.lxiajhva3e9-d6x/ e ection buries itself in a 2.4-kg block of wood a rest directly above it. As a resuhxv9 l a6-xe. aj3e/dilt, 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?

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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 w6 6 dj(io;n8xiojc6efith a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See 8e oifo6xij cjn66d (;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.wdj9df2v q2 +o dd:u6m 4ojo: a9smxg40 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cja2m m4wuo+4d9 q 6g dddj:2ofxvso: 9ars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Object A moves ea )ce vi155oexam(zvw 8g0era:st with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastme51 xr(ag)ve w :a e0o8ivcz5ic 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 4.v x8:g2focbmfr e:k*00 m/s. It explodes i xr0bv8f :ck oge2:mf*nto three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with 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-k tkumwkm)2 2 m6w2a:vgg mass sits at x = + 21.0 m. Where is the center of mass on the x-axiwmga2 v6t ukm2)w:km2s?

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 pars1 n75qyzj vk)ticle is locat)ysn7jvz k5q1ed 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 follows: 2.0 kg at (0, 0),.2 b ji-x,uv.:fra)ku9 ymz8 gbkfbs ( 2.0 kg at (2.0, 0), and 4.0 kg at (2.0zfi:-f yaksb,x8rbg m u.jk9 buv). 2(, 1.0). Determine the coordinates of the center of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0,:am mlj,nz( g. 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass of zmla:(j, gmn.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 at (ll+ 6jndhn 9.i12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of thn nd+l6hi lj.9e 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 calculk3bw95 :a ssouate the position of the CM of a whole leg including the foot when the leg is stretched straight out. Assume tk:obu a3ss9w 5he 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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