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

1#

What is the SI unit of jlv r.,:g;aaqmomentum?

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 caeo3i*5n rlz3t nnonball, the 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 frictionless txfxby8 ky6j;(z+,2fx r cdz3level railroad track at constant speed. The car is open on top. A large lo3f 8zxc6,yb jdx(kf+z t;2r yxad of coal is suddenly dumped into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on fric-xae8x (c3blwh9hj t9tionless ice. What happens tw clj3h9taxx -b89 h(eo 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 are thrown with .8,9svbr l 1oiy n7oirequal speed against a wall. The ball bounces back with nearly the same speed with which it hin,soy17l r9i. b8 irovt. 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 yheeckx,ileg.t(y;z enp l p:*6, 4mk,ou represent its kineteeexylk * ,: k, 6mz;(lghep4c,itpn.ic energy in terms 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 th8sf0c tmz3 8wd bd2e9ue kinetic energy you gave it in the previous pitch, thzu 9 d8mc28tef3sdbw 0e 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 s g 3c,y)i7(8pet,xt uzzv8ys xo;qm2law 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 conservchs:9 3 vsn sp6.k/pjaqvem03 ation 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 onawjijujh-65 u pm-;g2 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 accurate statepjmb7,7bjway p/c5 p,pi.g h.ment?

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 collisib.-ke);dqznd.tt g0ac2i hm *on. Which of the following statements concerning the magnitude of the averagk;ted - hcbz)2iamdgq *.nt.0e 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 otash+x) r u:(pu;7yj llher 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 magnitude of impulse during its collision with the floor? ) s xu+(l7l;u:rpjyah

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 moviu9 oahud-9n ; mko7a4ing east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, a a4iu;nuhm799o d-kaond 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 e8yw 3m 1oelmjn8zn*9mach other. Linear 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 th lmw,(-5t wowse right at 4.0 m/s. It collides head-on with a 6.0-kg object moving slw ,wt(o m5-wto 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 a02cs)jo b0 3q jiwcf d7g3jg:ct 2.0 m/s tackles head-on an 80-kg halfback runni2o s 3b0jc7gjj)qcg f0 3dw:cing
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

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

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, the w0cxclq i9 d-u 1yza0lm4me0+n which of the following statements is tilwccz0 4d+mxa0e 1 -y0lm qu9rue 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 coac5to 6; qe9w3r.p k u5r7a0rvmvd5sznserved?

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball h .mnc5g bvgze.2c1)ocits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball .z 15vmce)cb. ong2gc 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 collides with a heavy ex)fcpy1yp8fh 4 4g2v-s4kq /yul)r cvvercise ball at rest, the beach ball's speed afgfyvcuv -c44yk42h 8)pq )1pfrlvy/ ster 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 to9zy+q *ooovvg3 bjs/y* :u.pl the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collioyv* 3 g9*l.bsjzq/ vuy:p oo+sion 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-o5 n -;h,vx(+uij )k, s)aibignq:g ivln elastically with an identical ball at rest. What is the speed of the initially stopped ball after the uq)x(nb);v+,vshj k iglna-i:i ,ig5collision?

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 f/ .0 h3cjki rmje.md;object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of h3rjmd/km f0 c.;j.i ethe 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 witg b0ct-1f,0itd hhz4 sh a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of thez0gft4bsh,- 1tid 0c h 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 tefs; dz: sz5ico wttvs4+5;.o)w; hl m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What . v o4ttf zdw+oe;l)zc5t5hwi:s s;; sis the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides head-on with a very6upu7 )4* a/azu+/h hbrvzkon 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 +arkz/p) 6hn u *uh7uza /o4vbthe light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, then which of the fom 2ttn a /khm1ooi,q51llowing s 125i1ot h qmonkma,/ttatements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. Kinetic enen6zqq*d 2 r n)v,u:5yip ox6bvrgy

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 colli1fupq bt-,vm( des in a perfectly inelastic collu,bqv( -p1f tmision 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 witr; 6 r4igkybk1h a large object and sticks. Which object experiences the larger magnitude of momentum change6i4 yk b1kr;gr?

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 white556lf:/r oj zcubbyuc(v t:+b cue ball hits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following statempie vkn -yz))0ents is false?n v pkey)-0iz)

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a false stowbq b c b5)87:1co3 prirrj-iatement?

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 r68+hiqt2; i t v8fg5a 6bgfsteod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally, releases a bomb, which explodes before hitting t ngy14edu0e-j:vk 8bhhe ground. Neglecting air resistance, the center of mass of thkd gehjby041 nu v:-8ee bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-free road. The collision was comp0;a-*ioyau ixt u4 .zyletely inelastic and both cars quickly came to rest durinz *.4y ui0;i -aaytuxog the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

C. It was not zero, but ended up zero.

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law for a system of parti oje)zher:2c+cles.

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 a6 dms6ry 2x6*:ecqlml;rir* 7wi z4pvt 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 magnitryj kx*6(a7y/o5 mceeb, a s5nude of its momen nyy5,o(ram*seea /jcb 57xk6tum?

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 8ry ,;vanbz ,qvc2n f4kg is dropped from a height of 12 m. Its momentum when it strik;4zcbn nv ,82f,vyraqes 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 perpendicular gl6js(y4xbns n .f */zto each other. One moves with a speed of 25 m/s dxl6 s* b./4zj( yfgsnnue 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 horizontally at 30 m/s, strikes a wal:nge3ymj 1gxijir+7s +l jxa (/kv*y7l and rebounds at 24 m/s. What is the change i*1r +jklj3 (7 vymse +ijggxy/ xa:7nin 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 b0lzc8(qw/w 4c qzpbej2 ;-ud cy a racket causing it to rebounu;/wqqc ( cedzlbz24 p0 w8-cjd 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 b ar/uast *f(6(excluding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a st( afs 6b/*arupeed 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 ca2e ;:jam f*aetpsule and is stationary when the tether line breaks. As a means of returning to the capsule he thrt;: jaeaef *m2ows 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 approaches head-on a large objec 15y6g1q xupt :+kw7nkniaae:t at rest. :1a k7iepkug nyx:5natw 61+qThe small object 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 your friend (40-kg ma7n6ah qu rf*kdsohat1(fn e(;f42; 0io( tsrpss), who is standing still, with open arms. As you collide, while holoos( h 2t*he( n61rn7a(td 0;ipruqk; s ffaf4ding 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 leverweohc,ucp3x2 0 /,bb l, straight road at a speed of 6.0 m/s. opu,3xw 2/h bc,b0cre It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rea twvay-/ ys4cou61-8g krxma (b( csk;r of a stopped car that has a mas8ux;cav aty6kco b(- ks 4wsgm1/r-y(s of 1500 kg and they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allh/krf2szv iy j(u78r9 owed to coast along a level track at a speed of 2.0 m/s. Izi y8rfk(ru9 2/v sjh7t 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 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 negl6vk d:2qpp rb)igible 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 thevkpb2 :)dqp r6 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 0ho m3 24bqm,; tqovoxlog at the rate of 0.80 m/s (with respect to the log). With o43 qb2mm;vq0hxo,otwhat speed 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 force suddenly in fa(v.c:kog(z creases to 15 N and acts for one more second. What i(vk: (. gfaczompulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6.0-kg object. What is thew/ky8uzcste* 5 iprt k9;eaej:9s/3 2wyi r7k object's c87 /k9u p9e:2isr 5tj* 3;eki ea/zwty swcrykhange 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 the right atk4oy (g9 hc c*l(dmxvp 8u+,bz 30 m/s, collides with a brick wall and comes to rest in 0.20 s.co49d(b p+m8vcg,l uk x* zh(y What is the average force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ba t(j*w0sf-. n4ggoxo all back along the same path, and at the same speed(-nojgto gxs*f wa40. . 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 ozl gi( z+wl(2qat3n8dnto a table top. The speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on 3g(aiz dqzwn2(l+8l tthe 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 bup2f4 4 ln gqel jqq/ecypk;6oho)4)s)llets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the machiqjl)y4 eseo) fph p/ ;o6q24qcn)l4gkne 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 bui6xd, w0 ovdta d(obv2y n7m-m4lding in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the miniv myod bano4t-,w0m dx2 (67vdmum 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 drainpif0s8e bb,cd8g74;hzm8lut cx pe at the rate of 120 kg per minute. It falls 3.20 gd efs8x tbbm0 7luhz;488c,cm to the ground. 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 ms b.6el*ve;y sie8 y8rh0i yn./s after 3.0 s, when fired straight up. What average thrust force does the rocket engine *ilsynvh8i6 re.e8ey 0.b s;yexert?

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 kqmx ;fw:jfrr-c4/*nc g and 80 kg, are initially at rest in outer space. They push each other apart. What is their-xjqcn/f :rw4 ;*cf mr 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 3lwrz 77cwuf-ka;(z jnfm46cspeed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the totw 6(lz -ccnzw7;ja74 ufk3 rmfal 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 i5*mylaw -w pcxsh1(ruf kque(4-fz :, n the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg * xw -(4wr:1zhq,-ue(l csfy apfkm u5object 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 bloghuwj269fxc9 z,(cg mck at rest. The bullet emerges (the bullet does not get embedded in the9gh2,ucj zg(c wx 6fm9 block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struwfoy tki52).bck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collisio5bi.2ftw)o kyn 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 h-z:wya8 y(f 8r8w bzqg+e,ag xead-on with a stationary ball of mass 100 g. The collision is elastic. Wh 8 :fygbe8wayg8 wq-x z,z+r(aat 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 witk(gs8rapwn j 6a *zi,th,( i)vzr,p+ th a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is pe *rh,r,,k n(gpt zwsvp8(a+ijzi)a6trfectly 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 speepgj9 -idfz):dg. ;0n(9ra++pjeriu ci d ybm3d of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masu:c gpzdb dn+r+-a;i)j90r (iey.g 3if d9pmjses 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 c3wbj.:dj8 x2pzk 4e m4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this coll82c4p.x3wjmje :dbz k ision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station wagon, whw)hi2/ rcbah.7 f agi1o's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kra whi.i/7fah)12cb ginetic 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 prs6(x5d1+f7/2 zhrhtraibb 213 m/s in a vertical direction buries itself in a 2.4-kg block of wor 57baid 2 ( /h6s+fxrt1pzbhrod 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 car traveli0ce u6lf8xel7ng at 60.0 km/h south. The two cars stick together after the collision. ce 8l6x0 fu7el(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 ehqsrr(t feu ,ex3v8fiw +;x5az a 62,past collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.6h5u; x,i2 ,rzr3t8 ewa s(af+qvxpfe) What is the direction of motion of 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 sl/vgpt-k+ w*jwf 0/iht,qe-)uuj)f pc 4kh)frictionless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magnitude of their combined g+pk4juwviqfle /,*f sk)uht/- h pc t-)0jw)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 y z97ovmtwipr03 s 8z(kg, is moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a7iyr0w 3pmz 9ozts(8v 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 sits at x = + 21.)n(n/fa8hwn9 0lvb)auat wl :0 m. Where is th:( v )0ll/)tuh8fb9n naa awnwe 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. vh43 sqvsxe h c++gnc6+a3; 6iryyrsg+m68ug One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What 6yvqxe rhs+3 + cvsr 3hs6yg+amincg8u;4g6+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 krqeg6,bw9aa) 6b0g jag at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of masr, 9a qabbj6ga6ge )0ws.

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 locate2da 9g kb/ff1iszgi1+ 2lv-uud at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass2zggsua 2 d 1f+fk1-/i v9lubi 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 posib:upj2 :x f4+mpk,p p1mvh dc7tioned at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are the coord: 71pjcppvf xmku+b md4h ,p2:inates 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 positionwt-h hmn g- 9-.xsxd+y of the CM of a whole leg including the foot when the leg is stretched straisd.nm 9+y-h- xwgh-txght out. 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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