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

1#

What is the SI unit of momentum3(me1o pltyl41m//v vbx c 8om?

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 back uhy9o*w u7d+nbh ;p+7j ap0blward 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 afjna6 z q1nf,.t constant speed. The car is open 6 fjfn1az.,qnon 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 sidewatewg94; 6 8lx2 st.aa cy .ud*hwnua lqwv0/(qys off a sled while sledding on frictionless ice. What happens to swal4q 9t8n2yu 6 qa/ *gcv0aetl(. h;uxw. dwthe 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 eq4y/ r48y0f;uv mfwy vuual mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the gr mu /08fyr4u;wyfv v4yeater 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 movin7fcl-. ilvq,wd8h17 duqodi6 g with a momentum p. How would you represent its kinetic energy in terms of these two quan i, 7l.d w71vicd-uq6q dhofl8tities?

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 .1sy z6mjb :ziwith twice the kinetic energy you gave it in the previous pitch, the magnitude of mi:z1ysbz. j6its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of momentum* j;+ sbgtiewx rjn ta;i78yq,47o*rr.

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 pht mhbk 8-7/.mxjh,sof 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) grqobu-:y ozsf39bpu4x*5;v l6 tf.vrb aph 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 followinyy6;mil/ gd7 b2/ jet;qkw:qs 7+dny sg is an 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 witn-r sbjnvw;a+ c/x3/ gh a large truck in a head-on collision. Which of the following statements concerning the magnitude of the r/ ja-gnsvx3 /nw+c;baverage 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) are dropped from the same he25g a9 ouw:/ctgl tp7iight, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of im7c/ gpwg25 ot9utl:iapulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, collides with ayytc in21a 2:6-jrfj l stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly jt:y-6l1 aiyc fnrj22to 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. L2 y *i0 ed /h9tluhhnkp.se27xinear 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 tl3dpyw+x o q55ldb:r)he right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement5: bqd yox+wdp l5)3lr is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an ;z4m dqu5 vjqlc7mq*r4w+c 0d 80-kg halfback r 0dw4zqj ;m+rq ql54c7c*mduvunning
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 whichdylo2+ j8lsv;8u)5ivl+vu 7n g v p7jppf;k6i of the following statements ipsvo v7;2 76p; d+lg5py8il8jif u) j lv+nkvus 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 conseqf:um mb+1c df:/2xdgu7flbb4jn.6 zrved?

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 br dki3zw+, g(e21smg fall and stops, while the #5 ball moves away wikr( 2w3,ggm sd+ ze1ifth the same velocity as the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

D. any of the above, depending on the mass of the balls.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with*ekl ku3(4ir:/5e3fx; /n q wa iriict a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, appro ietu*q 43i;cr(35inx//r fewakkl: iximately,

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 heabj;yku4(e,s j d-on collision with a stationary bowling ball in k bjeyj4s,(;u 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 of 5.0 m/s collides head-on elastically wia,jp) 4 zf7a4 pb vqmgj+):rrdx.a*szth an identical ball at rest. What is the speed of the initially stopped ball after the collisiongm pr.dv ,7a4xfsjza+))pjq4zr * :ab?

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 ml ycvypsu;u/ e+m x80shy1:f;oving with speed v collides head-on with a very light object at rest. The collision is elastic, and there is no frictiomy8 1ysfx:vh 0ly s+u;epu;/cn. 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 sp+4ia7ofj( y *nt.sz, jjq6uq reed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The sf no7aj+jj*4st.qyi, 6uz(qr peed 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 ofjmeg) 5,fq eo. +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the ,q5jegm o) fe.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 cos+i-:0 uk(dvbwuyb +rllides head-on with a very light object moving with velocity -v. The collision is elastic, and t:b uk r(-d0i+vu+w ybshere 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 collisv1ak2nhc how 5/4g1l cb:o:lcion, if the momentum is conserved, then which of the following4bankw2 lh1 cvo:c:hl /1gc5o 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 stickqty( 6* 5bah cgl) l2)mvduh:b 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 rmygs. m/;s 3jodp y9.to the right at 4.0 m/s. It collides in a perfectly inelastic collism.rgm/;3yjdy p s.so9ion 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 ob+n aba 48dyy6hp9dfgujz1 jw (nl b-;,ject and sticks. Which object experiences the larger ma69uya;nl, j dab1+nwdyj- zf 4pg (b8hgnitude 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 ucpi418apo.m 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 a7;cu+cu u)s xtxh ;fl 2pt7yvn35obc1nd m. Which of the following statements is false?c2xh)tl;snc73u +5yu1c tp v;7x uofb

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 statememw(e9zrro e3, nt?

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 ljn 5hrlla- 7m4ong 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 explodes befbs5 qfxz iy39+i)bc)iore hitting the ground. Neglecting a +b 3bi9xcy)5f)izsiqir 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 friction-free road. The collision was complijjy8nn6v a 8/etely inelastic and both cars quickly came to rvn8 8/yja6jni est 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 lal+z3f 4t6h wnnw for a system 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 3 bcf+of5 bp-pg*;4 bow5 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. Whr8esb*0unsm 2 xk92qak .s5 cjy) +ccvat is the magnitude of its mom2a +ssrcynsc50) x8q e2j*kk.vc9mbu entum?

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 momentqzok z6,slfvc.o6r w5xv,0wxd/h /y-um when it strikes the ground isy. x ,c,/5d/xzqw0v- flo6krz ohs6vw

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-kg2 *lehk; os t 3f*yqbt1j-lcc: cars are moving perpendicular to each other. One moves with a speed of 25 m/s due north and teh y 1sk** o -2ftcjllb:;q3cthe 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.y xvtf;l ,xj:310 kg, traveling horizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentum of;,jv3: xtxfyl 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 st+xs)e3vvb9mtzd)2c sgx 4k6aruck by a racket causing it to rebound in the opposite direction at a sp 23ct 6x )svsxbzve9mkad )g+4eed 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 (excye fwlw7zwu-pc73 20 ykx1kb 1luding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching ma-eww u 0pxc7y1kf723 kwz1ybl chine? (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 imqg; qjok52* 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-ijoq;2m qg5k *kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches head-on a la(8t k5wrqz5vqvb: kv 2rge object at rest. The small object bounces straight back with a8vq zkvtk q2r :5vbw5( 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) skat2 nl i0nnbmy:5g k3jpg-r eeim0w0 *2je on ice at 4.0 m/s to greet your friend (40-kg mass), who is standing stilne i: i-lnbmnp3 egg2k500jyw2 *j r0ml, with open arms. 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 righ25jhf d.,oknc y(te0m t along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the cnj5my f e(cd.,t0o hk2ollision?

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 tha* 20og 4jmucvbt has a mass *0j b2g4cumovof 1500 kg and they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight cx*qmn675gha6n*,8 d y afx jys7 jz3nqar, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed dnmh77j5 sn,xqaqfa3yy jn 8 *x*zg66 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 negligibed.qc 4bf)5fr4k0qxz le 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 moving afte e 0 rbzx5f.)dcqfk4q4r 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+ s51baapdm4 7n f/4gs0ok,d.bb ucjw log at the rate of 0.80 m/s (with respect to the log). With what speed dob b jw0da5cksn4mfoa,7pdgub.4 + 1/s es 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 obqnqmo1 /ej*f3awajj :yd;t qu)6h; x2ject. The force suddenly increases to 15 N and acts for one more second. What impulse * ua1; /w 3j;yt 62oqj) fnmhdqaex:jqwas 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 so-k- r7+-wrn b+stla on a 6.0-kg object. What is the object's change of velocity?-- k-w+lrntsob+7ar s

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 a-xi r yywq6 r08nwtm)4t 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the averar0rq -imnw8w6 ytxy4 )ge 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 pitchgg57b0+s fx 1z)u+qv, pnvd haed to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the qa h)7bvx,u+1g 5nz0fgd+ps vbat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speeds of the ball right befor7s;*rixvp i1bbd0*o;9ztfd x e 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 aof0r7 z 1;*dd*sb9bxip;x i tvverage 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, with a muzzle velocw6()e j r7szgdity of 750 m/s, at the rate of 300 rounds per minute. What is t6j de7()szwr ghe 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 tbmzga2x (pxp.59b0k of a burning building in order to knock the door down. This requires a force of 10xb kx2zb0p5t( m.ap g900 N. If the hose delivers 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 drainpipe at the rate of 120 kgzrbe29 2i:2kwi e:dla)i; qa43v w lyt per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average forlvdby32ia:):zwt2i9ea2 erqi klw4 ;ce 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 k dwnpp ;hgl-;h2vh y:6g, achieves a velocity of 40 m/s after 3.0 s, when fired - hp6dhglpnv h w;;y:2straight up. What average thrust force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially4 hh61pwm gs:ew. njygq1uv(2 at rest in outer space. They push each other apart. Whm24w. up wsy: qehnj1v(6 gg1hat 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 m/kh8iv 2rrxa2g7 5ky 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 8xka hk rri2 v72/5gymthe total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 t38sae0ex ,lcyxww; *m/s in the +x direction makes a head-on elastic collision witheys w cw8;,e*xl3a0tx a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is f 1jav)t/wngt6-1) jofb1gdcpired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of tp)gotg6 b1)ajnwd1v /- tc1 jfhe 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 alpe hyoqemx s2;s4+vsbc 7)oojee3)0t0ha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's m+2) e0y qvj7 b;mcxeossoeoh4s)0e t3ass 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 mne +v5;.3zzbcnk7ajxjeph z a-t9r+4 /s collides head-on with a stationary ball of mass 100 g. The collision is elastic. Wh7aa+ jv;z9jhnkczet+ . 5-brn3zxep 4at is the speed of each ball immediately after the collision?

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

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

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

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

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed o;a wb,8ezd/d lpqxt7- f 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfec ;xb8lt/d, 7z wd-aeqptly 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 5rfp/dh: 1ejahv+5 gg ,.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic,pgafhg5 evjh/dr: +1, 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 ofus f/ e7iu3ahmk9 93ge78vwsn 4.0 m/s collides head-on in a perfectly inelastic collision h8sa u9imnsug3w 7 f3/e79ekvwith a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling wit3qa4:uw7 mafxg e/o*lr,wo r5h a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in to 3of , rw5/:wg4*x7amrqleauhis 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 2.4d+f b jcz87peh 85)ltju /h0wr-kg block of wood a rest directly above+dh) /w7t58fch0zb ju p rejl8 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 3005o2*/vt.nnba 43ayk t ao*tywdk *t/c0-kg car traveling at 60.0 km/h south. The two cars sticbo now3y*kt*.k vyatnt 54 2da t*/c/ak together after the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000w(ue fp ;nv;f5 u p8mvcs*,q1k-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 motion of the cars after cs8(n,p 1;vvq5ufwepcmu* f k;ollision?

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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 levylm6lhdp0 ub uf+i6p;ak/wi65v : ng4el frictionless 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 inelastic collision. What is the magnitude of their combin +np0uhv ay5lbg;6u:mlik6pi6/d w4fed 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 -gsx/f217m)+k g8ksuvj qz on North with a velocity 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 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 fruq1gfoxz sn vm kj+-/s)82gk7iction.)

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 mdiol lb3t2 8)w. Where is ld2biw8 )tol3the 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 two-zea )c-ud )ex1zwu++g particle system is at the origin. One particle is located at (3.0 m u+)+ze zeduax-c)w1g, 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), 2.0 kg at g+a8g1q cd:wp(2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the c1pga+ 8gqdw: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, 0),k/og9j ak)t -r (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center gj-k )okar /t9of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is pnuyo;-v.nzci ).-)pezu i25 gp6lk u gositioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three ma2lu6yp .p)k-zg uvi;ng 5nco)u.-z iesses 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 t.ac:ot0p kstitc1 +- ei2o )zthe CM of a whole leg including the foot when the leg t :2c)tae-+si1zi0po.tkco t is stretched straight 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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