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

1#

What is the SI unit of momenturyx -(4av-s3kw1u+6yezqxgb nh ) jj*m?

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 rec-mgs-ib7a3hut71ss1z + z njaoil 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 a9.2v.sxg, cp /xyby sjt constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity v ,ypx9g2 ..ssbx /jycof 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. W ;f7j)wx +cki 8;idzt4xol s+ehat happens to t)z e t7s8dilc kxo x+j;+4f;wihe 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 eq: 3dw2xyf 3vxj+w devr9ry( m6ual mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same spw(:3mexvjrr6 yyx3 2d w9fv+d eed 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 repre5 sgv2o)+5v) neq,b+zas+kj: esoxubsent its kinetic energy in terms of theseg:baev o5sx, )5u)n +o+ssv2zbkjq+ e 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 k r n7az,.-mxste-y k3xinetic energy you gave it in the previous 3ym,a.t7znk s-xr x-epitch, 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 :.e t9kecwog )9,az qblaw 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 conservatiug3(zcybkg d).m v+j;on 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 curxdpp l wo*b- jp(3n40 q4r/rvwve on a Force versus 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 following is an a nl q-u62l/luajr 9uxkuk4q 1.ccurate 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 hi 0jjrj pki1a8k5.,rgrs *s:9i2/pvzs4fe btruck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force hrpjfikirs*0 8 v1:9,ejkgpbsi2j r4z.a5s/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) zwze zu w8qftaz7f/ (1u5a hp,.t(x -kare dropped from the same height, and rebound off the floor. The rzk(axt8a-uf5.et h(wzzu/17fp q wz, ed ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, collides with st egw-i+mnb ezx4046iqn 5d*a stationary bowling ball. ti4mb e5+edin xz0 w*q-46g sn The Ping-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. Lineo 3qhjmwp*8n4js) cd mfz f972ar momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides hbm/c). y,q. xu6edk nhead-on with a 6.0-k,mec y6k) xun.d /.hbqg object moving to 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 moving at 2.0 m/s tackles head-on an 80-k)dmgl3 rzzv7xzve(e:p wu.8 v :on --rg halfback runnivzv 8px: 7 -nmwd). 3(oeuvrez-gz: lrng
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 conser81edps+8hyzy d 3q:xhved, then which of the following statements is true abou8 8dy+d:3 yehxh1 pqzst 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 conserve3 yl5 umqrc8-z9gxb3c;d hvl+d?

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 wh+ n()w-l bxh srv/t uad* pw4m4v91zt0)spouuite cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type )9 w-mxh)v4 b(*lttruzu dswo 0 v1psu4+ nap/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 +szkwo.78;gvk8 jv y+ufer)peed of 6.0 m/s collides with a heavy exercise bw kvojf88p.+ )7zuv+ ;skeyg rall at rest, 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 col ,r)j0,/ aot xrdqmx,plides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfer xj/a,0,o)txmqdpr,ctly 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 aqxl3 *a /rm7en speed of 5.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the colqmren/7al *x 3lision?

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-v-he6 77dep(a d4-vz9 kiej 1mv3wfixuai r: with a very light object at rest. The collision is elastic, and th d h7fvdez mv- :64r9a-a xpiiiu(1kjv e-e73were is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v collides head-on with a very g(r pom+n7i() h fj,5*zxfarjheavy object at rest, in a frictionless environment. The collision )7mp z nrif(f,hj jr +ag5*xo(is almost perfectly 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-xme vipp r0n++ bqty*)7vx5*y on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow v +ry*+p 5bxmq0vip*etnyx7 ) 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 collifjhle t;+ gbyjbj1*97des 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 spe*b7j jgte 9y;j1l b+hfed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, thenzx7c yidt3el c1v0+d: which of the following statements is true about kinv i7 z0ed1:lccdytx3+etic 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 stick together. yj69 gcufj n3ts( x4ikt uhv(gle42;1 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 ;wils;c 7 gw;gm/s. It collides in a perfectly inelasww; c;l sigg7;tic collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object anilue8l(d,hz2 kndh t7 mht: ,) 5+jeuyd sticks. Which object experiences the larger magnitude of momentum cham:+,hn lezhey7)8 jl5 hut2(duit,d knge?

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 d818h ldwfu/x c)0zallwrs2u 9 eflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following m/rtanzr7b4gik1 j1j 6a1 ko *pj e.6v-tcdf;statements is falsej 1v6ogz; /m ncj bkjr.1it4kaatdp*6e f-r71?

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 followings-b6l w(n4s cg6a0d um 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 witbwe+- sw sz5 :s yi1-s)nj3zpyh a long flexible rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally,j 0l beflg38t,aq(b1w releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the wq( lje0a b fbt38gl,1center 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 fdsfw mlddxks;*( /. k4 m0du7ujus(, was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this du 0s4,xsd/*mkk w;.sul( 7d(mdfuj f 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 systemnmvwvm4t.( w1l g05iw 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 42j khku 2.bbstruck 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 moving south at 20 m/s. What is the magnitude of ity)bxdt019-ywnx2 f 3 ln5qie bs momen 0y)ye bli bwf1qx5t3-d nnx29tum?

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 heighj55*(syybmqhj1*+z 9 mt e9uqj;wjb tt of 12 m. Its momentum when it strikes t*m;j (qtuqm*+ e9ybj 5ts51b9jzw yj hhe 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-kkbd(4es. -si b.a swx kj(1ex4g cars are moving perpendicular to each other. One moves with a speed of 25 m/s due nord. sa(x 1sbwi(-4kxje.e4bk sth and the other moves at 15 m/s due east. What is the total momentum of the system?

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

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

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

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikexk 8z0/ 1rirdis a wall and rebounds at 24 m/s. What is the change in the momentum oi8d1ixrrzk / 0f 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 struc:psg:h*:i l/rgmgm p / ys*k)rk by a racket causing it to rebound in the opposite direction at rm*grgy:p gl s :h/sm/k)*pi:a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching mach:omoa,b zz:l- d13 jzhine (excluding the baseball) is placed on a frozen pond. The machine fires az:- zbl od,a3:1o hmzj 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking ou8 56fw9ynune- dyjw 4utside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaude6 yww yjnf845u9n-ut 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-uy1r* gbee t(7c ky4u4on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large*4eury7y(keuct 1g4b 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 bf p+ ;c3bosvzel823j6 )ton 6ylr6 mpyour friend (40-kg mass), who is standing stilbz6lv8o33sje f)mc6t bopn; 62pr y+ ll, 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 right along a level, strai*dc :shjfuvl: t .d) :nk,d7ngght 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 colli : ,d:vnhfct d*):k sujng.d7lsion?

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 2, tv gndcjm5rsn/1u:t z+o,va stopped car that has a mass of 1500 kg and they stick together. What is t cvv21+s org,:u,zjnn5/tm d 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 car, mass 15,000 kg, is allowed to coast along a lvk2zlsp dq( olo1 l11*evel track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after cou 2l(1 oqkvlosz1 d*lp1pling?

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 n1qa .mra 3qh8fegligible friction on a horizontal tracq q r38h.m1faak with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.80 m/s (with respectm+ 70t es3;ywka:32gzgednou0ywe d 8 to the log). With what speed does the log move, winzwk2 +7;y g3y:o8mweags003 eet ddu th respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force suddenly increa+uvo9*2 n. r iqdmdmb3ses to 15 N and acts for one more 2*bmqm oi3uv+r.nd 9dsecond. What impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force af9 q 6g1h-e4zpp n e:1cg+mcdgg6f zw*cts for 2.0 s on a 6.0-kg object. What is the object's change of veq1:p6ec+g m 14 9 gzgzhfpwce*dgf-n6locity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30 m/s, collides with a4,i p0t/l,8i ta ylbei brick wall and comes to rest in 0.20 s. What is the average8 i,l0ibie ttl4p/,ay force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit tcntrd1k l.w*g ko26h 6he 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 ave*r n. hcdo2gtl 1k6k6wrage 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 oaq.gnwl3wuuz 96wi h9/-1hvh nto a table top. The speeds of the ball right before and right after hitting the table top- q9han ug9 wh wh6lz/v1.iuw3 are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force 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 b9l1tfw(;d obebo uw /m3d ta77ullets, with a muzzle velocity of btlb/ w1;3 oto w af7m(7eddu9750 m/s, 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 umjkd;(g6v) l*v .jc qorder to knock the door down. This requires a force of 1000 N. If the hose delivers 40 *mj.;6u jg kq(dv l)cvkg 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 r6ri0p kvi5wy ko-*2i eate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the groukiiw v6 ye02ik- o*5rpnd?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/s after 3.0 s,- +lznemj*,ls when fired st-e,* +nl jmzslraight 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 initially at 3mh,i x:5lq ugs1qjmg) b:z+trest in outer space. They push each other apart. What is their separation aftqgtq:x s,b)+h5glzj :i 3mm1u er 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 + ;gw hnylz.k0the right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1h+lk.wy0z g;n .0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x directi z/- f mjns/d+0eph4,o7glvszon 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 after4p gd,f s+m/o l/s 7z0nj-ezvh collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired into a 1.i(zya )f i1hs;00-kg block at rest. The bullet emerges (the bullet does not get embedded in the bloc(h ;s )afi1ziyk) 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 rest, i t dspltsxz./eq+ )7)qs 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-particle have after the co7 t )qp+s)xzs/q.eldtllision? (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 movingl k,os34;4ag y1qszm(to0cip +10 m/s collides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of o0mss 4,lcp1k ;o(qyt4gi3 zaeach 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 mogm0* bz z30nddving toward the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfec0dz * dg0mz3bntly 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 2ng iyw/chxe*b : -6yya speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest*hnbcyi6-g:w xy 2/ey . If the collision 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 p4cq3bp zlgzc6yu+ /i.n hvy;z:x9(yeast at 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 lp qcn9bghuvyy .;zlipy:3c z (x6/z+4 ost 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 zf9 25 wf)9td fedb9dwparked station wagon, who's mass is 2m. The bumpers lock together in thidw9w ) z99 e5dbfdfft2s head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction buries itsel57.maymai1de9frv(5b 6ri q tf in a 2.4-kg bv a m.(iry75m iba569rt efd1qlock of wood a rest directly above it. As a result, the bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

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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 sh,c(-kfxcy10j2cdt:m ffv l;3-ym w car traveling at 60.0 km/h south. The two cars stick togethm c k1h2,s; vxyw:m3cf--0yl(jft dcfer 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 3000-kg car travelizwn5h ;*:dg5 deic1xung at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion o 5cw xhnei*u5 ;gzd:d1f the cars after collision?

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface.tpn2. 8i6z h:c98pmg rhz7 kewoqs14f Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make7nwep46g8 :1zs9 ikhm fzctq 8hro.p2 a perfectly inelastic 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 withn5)ba2n7 kjnteiz+)m7r v3cq a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment mov)r 7be t n)nmj35avn2 iq+kzc7ing 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 tua i 6qt4n*4ka 10.0-kg mass sits at x = + 21.0 m. Where is the nuq* 446atikt 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 afz o9qq(n,t f */3hzckt the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kffthqn*93zoz(kq /c, g. 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 m ts 7 bktpo)jc4llfx y-v)(++(2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of mas pt7l) +(y lbsc j-tvfx)4mk+os.

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), (12ogz eqvqg;cg*6 ,/xr.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. W6qex r2*zgovggc/; ,qhat is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass isr5a rc 7gx;r-mye p:e2 positioned at (12, 0). What are the rm pxc ;:e25-e7 garyrcoordinates 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 posit:r *9kjl pzz8xion of the CM of a whole leg including the foot when the leg is stretched p8:zzlrk*x9j 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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