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

1#

What is the SI unit of moment )boj4fzh,y *f hy5t)ml00atkum?

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, the2 yu 6mqbha5xcnyqvw9n*-7x / cannon will 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 frvs i:f,*a5mj gictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happ *gmasv :5ijf,ens 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 fr0duj/t g/ my2zrb m9m5ictionless ice. What happens to /bzg 09jut/m5mmd2yr the velocity of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equal mass. They ary 1gu. 645xh37v qfhfr8drshh e thrown with equal speqxy.uh74 h6f5h dvg18fh s3rr ed 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 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 it:3,p tzbjiy9.ps9 s evs kinetic energy in terj pssi3p b9: 9y,.vtzems of these two quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic eny*p 7vx/q, gngkps-9qergy you gave it in the previous pitch, ggn9 qxvps-*q /,kp y7the 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 law in tf wrft/k99wp. erms 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 conservaaqo g-xj2yuiz; y e0p-qxt0qd:2o- 7 otion of momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t; c) se7oi:ejzqy2;sp wf55 um) 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 accurate statemenpm; 3:phca,obt 3(n96 peuchtt?

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 truckfxtzd5ir5 ,n;l kn3:h in a head-on collision. Which of the following statements concerning 5:z rt,d fh 5kxinnl;3the magnitude of the average 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 droppsy4tf4o,+a,ha :ncyyed from the same height, and rebound of ,o4fy4acnsta+ yh:,yf the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speez(x6n; siin;vxf a+e t65v5mwd of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to thevz(6t ;5;nsii 6awnmxfexv+ 5 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 moment1 cdrva ( c 5aqwjsk,5,fx2;q,s-re oium

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 headc,h) m0a6f4mngmy8 5j -y:xul0gbgl g-on with a 6.0-kg object moving to the lefl4 6 ):yx0u fym 8h-lcb0a m5jgggmg,nt 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 halfg:g 8g.olm/2i v4q; yx/npqsjback runns2.nmi v ygljq/p:/go8gqx;4 ing
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,)or :;pgf( /debic-*)svzrlk1mx /gx if the momentum is conserved, then which of the following statements i o/greg(x/bdklmi );) c:v-1r z fx*sps 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 co fa jhfbeaur 6)q1;3*fnserved?

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, thdb5hj.oq7fd79c x6xs4iu m 6g e white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had xdmoh9j 5c7.gf4i6s 6qd xb7uoriginally. 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 ro(b; kywg5+vumph9 ll/lling with a speed of 6.0 m/s collides with a heavy exercise ball at rest mubl5 hglk/ypwv 9;(+, 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 thekwgq9zi)w:s ()k f *md right collides in a head-on collision with a stationary bowling ball in a friction-fr9 :kzmqkfd*ww i( )g)see 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-on88ut nw4 obde) elastically with an identical ball at rest. What is the speed of the initially stopped ball after the collneu8o 8wb4 t)dision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a very light objecdh f)ne4l-7mf t at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. 7fe-dl)n mh4 fWhat 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 wit1m8 ehn t:qpqkz 265 1r: 2za,vjhhwhrh a very heavy object at rest, in a frictionlesshpenz krrjhvh2 11h5,qqw :zmt 28a:6 environment. The collision 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 velff;-f+ q )aauiocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the f +-af)qfu ;aiyellow 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 veloc5ea zb;6 +x-zzb ypfc*ity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light obje* ezypcz+6fabb5x- ; zct after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, then whw zz :m67m/sno e5uai+ich of the following statements is true about kinetic ener+i/:szoze6 ma7u5wn mgy?

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 kk gc jh:0*dle+ eh .xlhujl-3/:e t8fand stick together. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. I;1vu5o -p dvq9o cy1dxt collides in a perfectly inelastic coxvd19c oop1v;qy-u 5 dllision 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 and sticks. Which objej6xkyijzpds36f g -22 ct experiences the larger magnitude of moj dk jg2y26fpx3 i6sz-mentum 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 hi h(h 8*,iabc e8g,44qrsixiftts 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 mj5kpj-tzy; :a asses, M and m. Which of the following statements is falstz:;y5k j pa-je?

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 fadak 6;b8b 6y1,kf/ywc,esmji8nad6a lse 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 with a long flexible rod inq9kv a2nsvp5aqn+53*: eivev 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 befor jo/0 2*rfqpyae hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, ju2q/ypaorj0* fst 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.t:8beh4 g:jw+wxalx 2d y3o t)9a 9mx-engu1 d The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center oo3-dg+dwyb 94j uxatx:at1l hx): nw g28m9 eef 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 edg+d:+, ;pcyn(pbkm z6i(a yfor 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 q 9v0al,g 3ypl1 z0nnpl(qst8a 2000-kg truck traveling at 35 m/s?

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

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is movingw wpd0k0h8w u, w(l3okyoq-s 7 south at 20 m/s. What is the magnitude of its mome7uws 0yo3,pk(0lww-kw odqh8ntum?

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 momentum when i 4qtl q:t-1ucat strikes the grou t1la q-q4t:ucnd is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular toc.m2j bum;lq6 each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the bjqm;2mul6. c 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, strikes a wall 5(wu 1tek 9xl(paa)kmand (pk l1ku5)9a ewatx(mrebounds 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 bal )vg2yvr70yo vl, initially moving at a speed of 12 m/s, is struck by a rackvvr0)7v2 yyo get causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding jhs7t;ou8-jbtkee whl7 60 ty0ilr v9h.q8q* the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a sp0 .vtwsu7r tllh bqq kteh88;e0 jo-6j* 9iyh7eed 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 outside the space capsule andqa.qfus,a b 4 gx- )59+t1umyqyray -o is stationary when the tether line breaks. As a means of returninasf-ma9-yqx,orua 45y+ u) qq1.t ygbg 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 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 approo5u. zx bakx77l9 9:vd1mdu okaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of th dvokz o: x71udbl.a9m7x95uke large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friendc c;)bpqlq k4+ (40-kg mass), who is standing still, with open )q4c;+b clkp qarms. 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, straight road at a 2b /d e1hln/rtnyl)-aspeed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. W alrne//ly dn-ht 1b)2hat is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear of a stopped car that has ag*y2 e3d,n 5 dklajlr( mass of 1500 kg and they stick together. What is the speed of the cars after lrd32l , y(j*eknagd5 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 cyy a*z2)d43u)z jms.8l augcl ar, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides * 4uj yzy)c.u )l28laasmgdz3and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction on a horizontasydc n ;v6fzr9j-w1 (uog- ed;l track with a speed of 10 m/s. A 70-kg stuwo1d-9c -e;f g(;vuzrj 6 sydnnt 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 (wi z-rm ,tmk/(xca bvt26th respect to the log). With what -(b2z,mrca/kv m xtt6speed does the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The forxubesz hi c5 c(+(:qa4qbicxt7.v (z+ce suddenly increases to 15 N and act+quccaz+cx(iq(ev. 4sx t7bi b:( 5 hzs 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 force acts for 2.0 s on a 6z.k1ek:yrfh 109*ru 4c r9p7umy qchh.0-kg object. What is the object's change of veloc uphmrerc.y0k7k:1h9 * 9ucyzf 1q 4hrity?

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 ttrq4iz 1d59u io the 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 eiu4 r5ztqd1i 9xerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back avub c6(7o 6 x+vhc6 )8bp7*yh; koeaehb uv9lflong the same path, aal6b7*ep xe) 87+9cohokhv cyfvbu6v (hub ;6nd at the same speed. If the bat 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 befsagd3w md3cfs6(1;1klx2on x vo63x wore 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 average force exerted on thc 3w6(1son mwgf3s2 16dod;vkxax3x le 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 mubz;-l 4vdvo /dzzle velocity of 750 m/s, at the rate of 300 rounds per minut-l4 dbovv;z/ de. 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 the dktz9 nu646 uxuoor down. This requires 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 d6 kuxz96tu un4oesn'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 horizonta6+tkf1f:kx(p g -gx uwl drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. fkx -:f(tk1p+u6xwg g Assuming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/y8s7znk cuz,vtn 1l9g,o: 3t)5g lgz cap,ge-s after 3.0 s, when fired straight up. What average thrust force does the rocke g -58,cgozk ,cunte)z t7g gpyl1:9zs3nva,lt 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 initixo3zqpq2 vng;zm81eqs(p 6i qh: -j7t ally at rest in outer space. They pz7p8gv :(sqq1t -z6 xjehq2;p nim3oqush each other apart. What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a speed 0,po m8m6v gygof 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left mv8yo6gm0 g p,at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x direction ml8m6zekoyw * zfgb3r: 48 vcp.rim3 6pakes a head-on elastic colr*b3m 3w48lfv8 y:zpkro6g 6. izmpeclision 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 a 1.00-kg block atnzy-k9npx 8d f*vo ;)u rest. The bullet emerges (thezf yxk;-v*u p9ndn8o) bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, a e(r ;*z 7 e-ob0xdp2jtpkzaa/t rest, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons)jz0ar od7b (p /2apet-;xez*k moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on;66hqooc pp5 z 0psmh*k8 m-hy with a stationary ball of mass 10yk5hqmpom; hs *opzcp8- 60h60 g. The collision is elastic. What 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 of 3.70 m/s colls c7co6g .pcus6w,t* yides head-on with a 200 g by cs. w6 ccs*pgut6,7oall sitting at rest. The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. ss1yq1d,) cz x It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed odsz, xqyc1s 1)f the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides hen .u1 nrgr+(jvad-on in a perfectly inelastic collnuvg 1r jn(.+rision with 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 fa9-f5zqbx.g with a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpe 95xb-ff.a zqgrs lock together in this 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 itself in ao s30+dbm2 yua 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combinouy3ba+md 2s0ation 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-y -sb up /i,blsmf::15vzl z1bkg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. p/5mi- zsb:1l:zf ysbb vu1, l7-1.) 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 travq(pgefj*qr(f9(w)5 gta6 ufw eling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direcgg ew5r)u(6pq(q fa (f t*w9fjtion of motion of the cars after collision?

本题所包含的其它图片:

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface.shz z7 /p2;jmtitzt 1* Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a z ipj; 71 /ttsz*tz2mhperfectly 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 with a velocity of 4.0 m1 )m0i 9 4k eflejj*.xz5anyuy/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 fric540fx kljune eyjya.i1*9z )mtion.)

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 = + 21.0tpia otx3/a5d1 + nlp( m. Where is the center of napt(x5l +i1/pad3tomass 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 atfvq v7(.k ptn3 the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the locvf.3ktv (pqn7 ation 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 positions yhe (v5q3f*k li9l89ajuz c2ed as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the co i ye(2z8h5 fsvu3l9j9*k claqordinates of the center of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 phhz4fh+4u o zf*46ty kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), f4fyh6p4tuh 4*+zh zorespectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kgc.fvdg ewk3 n /y,g)v r*b.t3i mass is positioned 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 masses being located at the ory . c/ev3i*,tk .bg3dn) gvfrwigin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a7a*fgtqk2y7q2 fxco4v 9iq)(i rqwdvuw:6 2k whole leg including the foot when the leg is stretched straight out. fqr2f 7 qk 4ica2i2doquwq t):67gvyvx9k(*w 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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