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

1#

What is the SI unit of momentum1 ayt 7;h*p1wcwa.wf*xz afef(1ol/ x?

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 0p8:ty, uz sarqqbbm,j2f/sh3)d2 l ewill recoil backward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves along a frictionless level railroad track./x 8qw2h+ht yl /w/ gtaouq1y at constant speed. The car is open on top. A large load oft otwq/a2 h1wy ux+y ghq/8l./ 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 sled while sledding on frictionless ice. W4*jr (p +,pifvapoe5qhat happens to ,*qp4 p5re (japfi+vothe 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 havehxr9*ef 2 vr)g equal mass. They are thrown with equal speed against a we rhvgx*2)9r fall. 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 p. How would you represent qdbnf6 ug6za- ,7.drlits kinetic energy in terms of these two qrq 66-adb.uf dzl ,7gnuantities?

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 kinepkn) 4w 9g5c5xw0y xhftic energy you gave it in the previous pitch, the magnitu5gxn)y0 59 pf4kwcwxh de 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 secon,ilo5dor9mplg . o*f5o8 7o-r a(zwggd law 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 momentuz3,s0nsnk kiix c8-u 4lsvrf*ux.4ul8d a; l 7m.

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 versb 72 (hz j 6b. ,:z vd2rrhx)d2tmzc45lhbntusus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the followingnq81qq4,oz/q t zb7my 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 with a large truck in a head-on collisionsa0 yv)x zg-q3. Which of the following statements concerning the magnitude of the average collision force is corg)0qyzs a v-x3rect?

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 oj: k)zr.38cq k0 ecpot5 x0mnrther blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnq o k:0c)85ejc0kn3.txrpmr z itude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/vh.): qa)+l bfag 5uzws, collides with a stationary bowling ball. The Pi l)z wghu5 q+v:b.a)fang-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

D. It's impossible to tell since the velocities after the collision are unknown.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce off each other. Linear momenc4eay2 rp42;ucim 1rz 0huvx*tum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It c1fj 5 tmpdsil 527zte5ollides head-on with a 6.0-kg object moving to td7es p5jf5lm2z15 itthe left at 2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg -*bq+q pi- cazhalfbackz- b c+-apqi*q running
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

D. this is a simple example of an elastic collision.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the mo;5x wwe u.d;ysmentum is conserved, then which of the following statements is ; e suy;.w5wxdtrue 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 conserved?wuq w9,,e rqm9pqu21o

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 4hto vh: gsh1+/krs-o cue ball hits the #5 ball and stops, while the #5 ball moves away with the same -svo k+1g4 /hrh:tho svelocity as the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 m/s coll 1-a 2pxi 497o-m )wzqdfngaehbm,z 6eides with a heavy exercise ball at rest1zm)b6pxz 7nagh,9e4 ed oi2wfq-am-, the beach ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in n7ra*.gxqc o opn/kpb+1 3ns2 a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is al. onnn*bxqrsg13+ap/po 2kc7 most 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 with an idc 2 bajy .y2q.,.ddxv* )hh* 9evk1ar ralmx+yentical ball at rest. Whad1,qrhex+*hl)v*2xarmjyc. .2 . abk9d yy v at is the speed of the 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 speezqj jb)s3ik.pg4w31f8knw8e7w1 z v yd v collides head-on with a very light object at rest. The collision is elastic, and there is no frvk18 7jqjb 8 syf k)1e3izgwwn.z3w 4piction. 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 k:auz w0,h4z5w pcu i)l8k8mfspeed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfekwhl5uwk4 8m) zc, zapf0:i 8uctly 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 wi bczw h toc ,m:;x-1lmn2at;/qth a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is c;a2wm/; l ocznqt- :1t,bxmhthe velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides head-on with a very light obxf4pe29zzhz0 3s dcmm o7flvu07xzb7 y+,1dq ject moving with velocity -v. The collis0zm mcv+z p ubhq72d ,7 xfe1zdlxz930f47 oysion is elastic, and 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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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 conserve .9)m3/ls 6j xrdxht3eh( xsvod, then which of the following statements is true about kinetic ened6sxh93.(m)x/lo tsh jx3e vrrgy?

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 togeun*wor)w08.mll(i ax h2 0kj ether. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inel6ys: 1 rfuo3f2sn7my b8vps7dastic collision bs7sf m6sypv: 3u7o18 dy2rfnwith a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Whwkq /(a0bg8rh ich object experiences the larger mag0hwak 8b(/qr gnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and is deflec 1 (xccep(bjy(0 jot6coxu: w5ygyq20ted 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 , :zvbzymkfu0-nov -2masses, M and m. Which of the following statements is false2mb0o f, vn zk-yvz:-u?

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 following1 r 4op6+og,beet *lonh.lw+o is 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 qn* ct* q22auowith 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 horizon,4q kxjrkpf. .69v)9lts,mxis0 pmgtf u3;hatally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass ofv9m4a, hlji. kmx3gsfp 0. )u 6q,t;fts9xprk 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 kssf ;:gzb, 3lroad. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of thisf ;lsk:zb3sg, 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 syhep2;pj19u r(9leowjr ,c. qs stem 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 - .857 xjt:ivmbs4 zmy6vymdbab q28dat 35 m/s?

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

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at w 8w;rpyux/gmxo7r*is-4 ik: 20 m/s. What is the magnitude of its momen: uk7p omwx;i4*ri-xgyws/ 8rtum?

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 frhlx5,+ bfosza1h+ r +eom a height of 12 m. Its momentum when it str+fx,e+ 1bsza+lhh 5o rikes the 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 cars are moving perh 8xg q ff9ucjrg-o(++pendicular to each other. One moves with a speed of 25 m/s dxo+r89g(juhf fq c+g- ue north and the other moves at 15 m/s due east. What is the total momentum of the system?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizono)cv.cxg: un: c bod/fedw,ul/9up6/tally at 30 m/s, strikes a wall and rebounlxo:o9v cfe dw :/d/u/g6u.u, npcb)cds at 24 m/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck b xf7qw tp 4- d/aox8zt;5ccmi)r:2d ff mw9r6hy a racket causing it to rebound in the opposite direction at a speed of 18 m/)w6-d zh:fcf famqr49 xxtdtp8 cio2 7rw;5/ms. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is pla 0 cegpe8i vyg42i4dx2ced on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horiigd28iyg 02e pc4 xve4zontal 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 outside the space capsule and is stationw4 v8qtaog*ce g u l)y7 bh;q/s7z*h87p,vnayary 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 the astronaut move toward the capsua*8ag 4o gwbhq vnu;7sl/hy8 ,y * q7pcz)v7etle?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches head-on a large objectp(al3y htqn2*f-,)jp h bg1i n.dvf 1e at rest. The small objectnl2 fiavp.nd)yph,g( q13heb* -jt1 f bounces straight 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 y1 fjlf /szp0)iour friend (40-kg mass), who is standing still, wit )0pff li/1szjh 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 trh4 h6i(6exva,ti* lc o the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a 6hca 6irxt *4ivlh,( estopped 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 ruzwt8 /. sybl3db -1jq/ netu2vns into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of the cars after the colt1-ul q3.btejzs d28 /nb/vywlision?

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, mankb1+ix9uy-2hge c9 l ss 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.2991-+hyeubik xlncg What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls d7 q+oxhl5jwu6h o .gnwz592t jyk1sqlcy9. 3with 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 moving after this happens?s z .nhluwgh c69tlkwjdj. x152q o9o3y7+qy5

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 rate of 0.80 m/s (with respsvdd5(hy , -v7rms eu glgn1.8ect to the log). With what speed does the ue8 dm7gvh.- ysvl,5 rg1n( dslog 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 ii/:;cl( 7z35 hppcgyps 9 yryobject. The force suddenly increases to 15 N (hl g pp;pcy/3zy7 :yi5r9cis and acts for 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 4i+ngxvb4wx(bb 1gr.zp.pfr jv-:(q - rwq d+ force acts for 2.0 s on a 6.0-kg object. What is the object's change zb(-j4r w4.rpbrwgq(b +qvgx i1-npd+f. v x:of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to t 0hlts 5u/ ajqov+a1ad:e+kb 8he right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on the wall?l1auvjb a5 e/+8o0hq+d astk:

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 higxe .z3no- -aqt the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnitude of the a o3.az--ne xqgverage 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 the0p cbr6c 0kn8sodbq5n xj:d*s hj (t19 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( j0ps6xjknhb5s01d *ocrc8ntb d9: q top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzz ,rx.:rvts6a*g g3o79h o fiuele velocity of 750 m/s,f39oga,6ex .rg :uso r*it hv7 at the rate of 300 rounds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building in order to knock t a; b r nzuglk90es02y7+aat2ehe door down. This r2au7yt reazbl; 2 en+sk9ga 00equires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce 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 kg qcc-l em:34nf per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force domcc-f q:3 l4nees 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*c )o *4afy7* ovmkdoc/s after 3.0 s, when fired straight up. What average thrust force does the rocket engi ydko*7f4o*v cc )*oamne 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 wtyf39+s mk*m b b,p;iouter space. They push each other apart. What is their separation afteit*3 mpk,mbbs; w+9yf r 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 with a speed of 2.0 m/s. It collides in a pez4m e *:u+9wr opdzb pn,d i2s;n7n4obrfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is theoos4,+ dpeuzr 7p* mn ;2n4izwbn9 b:d 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 m/s in the +x direction makesbkt3ll;ra z2,y1 6 kc4oazxq zp06+b-ipd l 4e a head-on elast- a1tzr+axobkz zbp 2lk ;64q3 depi04,clly6ic collision with 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 fired into a20 6 rrd(lvx hjsw9v4z)o -nns 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speedz6 j0-h )s4n9w2o srvldxn(vr. 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 h10n ihlm7,yrj2e9 zy oead-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-particle have after the collision? (As z 0e, r71ij2nhy9myolsume 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 :g z9iw5gszhs ,jr-u+ 6 s4jpc +fxlz:m/s collides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after thz:jfsh 6zrpl zx4 ui,+- wcj:9sg s5+ge 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 wq 2)qt5o3.9nzh gocggith a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The czghg 3o)tg.q5cno2q 9 ollision 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-)t yfzt:m+og 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what f)m -yog :tzt+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:e8nk.mpctqsa;)* .v jv0dyk o7yi+a a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost sn +oki;d78ye.q at)a yvj0vpk*c. : mduring 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 stati:n+nf.m) yi(duxkhsl khpb( ,io n419on 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+hu kiyo.9 x)hk:n , 4(dnpsibmln1f( this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction burieirqz:p.7f, ad zb8b y/kq2wj,s itself in a 2.4-kg block of wood a rest directly above it. As a result, the buq /ibrpzz8,,fdyjw7 :ka2b q.llet/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 3000-kg car traveling udi14;(zj i)0 oe2jsjc k4y zkat 60.0 km/h south. The two cars stick toji)sj4;k u k(41 zo0ez cjyd2igether after the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

本题所包含的其它图片:

A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-kg carae izi2elcw+9 7 0a5yr/duy)e 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 colle5leyw a )i+c uy/dai2ez9r07 ision?

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 4 h1zovum 9j ac, 1qyffoi1l80frictionless 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 colli1f viuc1ly o,0 zmq8o9haf41jsion. 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 +j qojiso r)(sjh-h hfaeurzbwp +t 7o8(.265 of 4.0 m/s. It explodes into three fragments: a 5. zjs)tp8oowq6h.+ah+jh (r( j-i72 sor5b f eu0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass +j8/g :i mq+vvmpj4ibsits at x = + 21.0 m. Where is t+gvpii/m qb8:vj+ jm4he 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-particle system is at the origin. O ;8vn gs1baf6jne particle is located at (3.0 m, 0) and has a6bjg18naf s ;v 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 a-p.x d5:hnmhkt (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of th-hxk :dn5pm.h e 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, u 8/; e.czucfkuhn-ow/v)pked 8 +8ccand 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the centpk u ucn8c)e./uk 8z8-;w/ v+hfcd oecer of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is positioned al3f3d rzlfqp c:i 4d:va +i04yt (12, 0). q:34dlpaiyirzc 43f:0+dvf l What are 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 tqp dhg/u3m p6zb6 +6p.u:uvc ahe CM of a whole leg including the foot when the leg is stretched straight out. .6m 6hqdppbuguz a3p/uvc 6+: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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