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

1#

What is the SI unit of rby9m(kf sa0hva hw k7-(3f7xmomentum?

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 canno9a0tw(x k .hb-acnz h7nball, 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 af d gqg/kmk, kw+j,-4dlong a frictionless level railroad track at constant speed. T+dmq-k4kdfw ,/gg,j khe car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled whil3(c zktipq-d5e sledding on frictionless ice. What happens to the veloci53kqtdiz( pc- ty 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 thrownxcz87 v qt 6s+(-slkit with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greaterqcsz+ 7ts6 -(8 vktlix 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 movin5s ti3 lbvgo9)g with a momentum p. How would you represent its kinetic energy in terms of these t9sl 5i) 3ogbtvwo 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 energy you gave it in the previoub2.a , i vu 6a6pgbpacdh:/kf*s pitch, the magnitude oif:b/p6hv6*agap . ,b u2adckf 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 terms h g pwpkfi9t;:fy a;s;05 )3za9 wvq ixll,4bzof momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of mom2w.w. * u 0cw7izt(bf d pr(ww9ez:zuoentum.

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 7li d-8x,/ekv6adr z c g2c-(hh6zdfg:s xwe0a 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 smi q:: m+kct9itatement?

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 headncji6 g 8gy(h1-on collision. Which of the following statements concerning the magnigh1j8 gny( c6itude 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 bl ntp(datf::.k ue) are dropped from the same height, and rebound off the floor. The red ball rebounds tot (df t:n:.apk 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 a szlx hed 4xkt r5u9z.68 4bwn*aoxs 5y2tationary bowling ball. The Ping-Pong ball bounces back to the west, azo sauhrw96x4x 5bk4 8*yzl2 d5e t.nxnd 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 aa h71)n6xf)ag s c3cvend bounce off each 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 the ri gfa lrcu0a394ght at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. 9ag0c af34url 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 f(8g 6di mf7tare9i ;bbslt(32.0 m/s tackles head-on an 80-kg halfback running9;i7a 8mgeflbr(s3itd(f6bt
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

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

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, then which of therqhg/6c2sihll 2f p+8 following statements is true about rllgsifc q2/2 p 86+hhkinetic 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 04,tzd vhbl1b x8gfn7 conserved?

A. in elastic collisions

B. in inelastic collisions

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

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #5 ball and stops, whi,1ylk tn.poua:z m6 5fle the #5 ball moves away with tk5 l1unpmo :y,.z ta6fhe same velocity as the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 ;y1oyo83vwk7af +,6vduau iym/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, apvy7a8 3kiwd +a1 ,yfuy;v6oouproximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in a head-on collision wiij2 mzmh9.4tz th a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf bal4.9izmh tjm2 zl 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 spr*:x)s1 f.dpq0acb imeed of 5.0 m/s collides head-on elastically with an identical ball at rest. What ismxqrpi s:cd .af 1b)*0 the speed of the initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with s1 l g:lmj2o1cnpeed v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collisionno11:l j mcg2l?

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 sq(ylcjt guc(ppaa4 :j1;gt :l-f7u ,opeed v collides head-on with a very heavy object at rest, in a frictionless environment. T,-ugf 1ga7 pp;j:lj(qtyl(:ccuo4 a 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 velock/nq:49 *ig).y hpi geevef 6dity 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 yellow ball after the cole/64kgey9dph qei*.n:i) fg vlision?

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 vwr2gqb n x9,1with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction.g2w,1rv xq9 nb The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if thdz(7(elq*ea o/ i:oh se momentum is conserved, then which of the followhso(/lo(:dazee *qi7ing statements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together.zue+/c mx5coodw .7vz ,+;ry n Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inm+rr(ehln 6d5elasticrre(hd n+ 65ml 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 a65 me9c)d,uozzsy *+ geg c bodu1o75c large object and sticks. Which object experiences t,75good*e )ezg15ym9d c c c6uubz+oshe larger magnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and is defle- 4ub3r tax9n z0mvpp)cted 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 statements is o592e0wz.qlhvxt hs8 falset2 95hlsw8qx0 o.hvze?

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 statemenij/x8vxt u ;v/7+m :hkg(iixnt?

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 wetcsfd 5+4)qf4p,eg b-;vheqith 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 horizontallypk.d g267oi xd, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of t2o6p.dixk d7ghe 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-os+j a/ .tzw1*wwg,-fee*7 a gm-j rvaon on a level friction-free road. The collision was completely inelastic and both cars quickly*r.gease wf 1o-g-a+za/mjwvtw*j,7 came to rest during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

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

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law f*1i.wy3bbtwa or a system of particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck traveling at 35 qfwn h-8dql 1,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 o-g6wsc2 ry)ywhi 98 l*vwvkf xsk*(3cf its momentum?k2wwiwc(g -3fvs*vx9 rhcy*ys)86kl

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 i4jbm2.wtx51v(v ac4 viwj;igs dropped from a height of 12 m. Its momentum when it swg 1bviw4mvx;5tj2ij. 4 c(avtrikes 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 perpe- z2an u*fb a,nb(eq4j7bb p2dndicular to each other. One moves with a speed of 25 m/s due , u a2bfqb27(d-njen* azp4bbnorth 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, travelinb5- 7yvojo:o)zicw v2g horizontally at 30 m/s, strikes a wall and reboui7c5 v-owb)y2zj:ov o nds at 24 m/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck/2x-5upvamm3sn 70* czx3yl(s l rhb 6nas+ux by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in mome /pxa37x-*u us r5my2xs6csnz3+ n(hlvl0mab ntum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is 8rny rs-0y)hw20mzxnplaced on a frozen pond. The machine fires a 0.40-kg baseban8ynsx z2-hwr00my )rll 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 outside the space capsule and is statpz/4;r4j2g3-velv-etr e aff ionary when the tether line breaks. As a means of returning to the capsule he thrf gv/;a e4f-43 2ev-pzelrrt jows 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 momen9z j/8j m;iqjt*ks kh2tum 5.0 kgm/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. Whatk2/ksji9*zh 8 jmq;t j 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 (ee-1q(heo 7rblym+.snz 7ub (hj;a t340-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both move off together?3(r+zj at(meoqh7us;y h1 . -beb el7n

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, s1*fzj;tx b*dbugz k3qf)s/7m traight road at a speed of 6.0 m/s. It collides zk / ;jfx3fgbqu1 **z7)sbtmd 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 thjem: g45mmc6de rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of the cars after the collisid cg 5memm:6j4on?

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, fbflqzs4w,0c- 5qi4y is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What 5i-f l,4sqyq wb c04zfis 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 neg49oi (r0u jj+vz6l ksoligible friction on a horizontal track with a speed of 10 m/s. A 70-k9o6s jju4+ lrv0zo (kig 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 th8t zqy)u h7rmr,z o)ub),lx:ce rate of 0.80 m/s (with respect to the log). With what speed does the log move, with respect tz,):7 rzycurb,)t 8o huxqml)o 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 k k f*-t) he-eu)kqih/mn(byl 9a5ad*on an object. The force suddenly increases to 15 N and acts for one more second. What impulsh i- 5-l*uahn /)k qk9e(mbyktf*)eade 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 5dy1r,yp ua-c ir(lh6 s on a 6.0-kg object. What is the object's change of vel a-y ( 1,u5irly6cpdhrocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to t o;x,w fel0 rz .cow*:-ksmtn:he 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 exslrex: ckt wn,-o.of*mw0; z: erts 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 pitchedz; q2 +ddio5rc to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, zcdqr2 5;io d+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. Theahg3ioniqj6do98f; 2,)j p( m;llq fn 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 ba j f3q6jgfdop8a(l,n)im ni;qh29 ; olll 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 bulq x/h41,.ptrofj v)mrlets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average fof,hoqrmp.1r/t v)x j4 rce 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 iy9 +1kwx2 yq70chpnq to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kkp2 q ihn+wx0y 9q7cy1g 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 horizg-l6jxr+jo h(r5yk)h yj; b5montal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assu)5g klj hy (mo5;rhbjjr 6y+-xming 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 t tfnj:1j4b/kkg, achieves a velocity of 40 m/s after 3.0 s, when fired straight up. What avera jnbt/4:j1 kftge 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;adtpd h1zvu n65:*w71a mzdx 80 kg, are initially at rest in outer space. They push eacmhd6xvu7dz:a n z;w *p 1d15ath 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 of 2.0 m/x uyl 2xl;,os/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 total kinetic energy after the col uy/xo;lx ,ls2lision?

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 8.b;z k *)k:9wbvrjl owe5uhv+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 object after colzjrk5el*h b9v;o)k.8 wbvw :ulision?

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 bry+qcbnc pi4( c: g8;dlock at rest. The bullet emerges ic b:q+gy(pn4c;8 drc (the 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, at rest, is struck head-on by an alpha-particl(0:nvhlu/z:l3 vyofe+ivz/ib h ex1(u 1o3fb e (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely e(0o3 /bb hi3 (ly+lnh/vfue1izv fze1u vx :o:lastic, 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 collidrt wqedak*9b0o wl)0bh1 /v;jes head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball imb tkj1q9)ow*0r db/v0awl e h;mediately 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 eaus1w.u6 dp4 .4,zdepn ci2vqorf ) 4zbst with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfectly elastodbuc r4 )su2f1p4i4. zw 6,z.edn pqvic.
(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. It collides head-owl7m/1eqe*2kpna . pq.d0r 5lowp rp1n with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collision?d7pq5 r poe1 n1qppm*0./awell wk.2 r

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 heacwlqyld8hf0a u/v88*oqs8 q( d-on in a perfectly inelastic collision with a stationary 2.0-kg mwv/(cy da08q*8 8 fs8lluh qoqass. 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 with a velocity v, strikes a parked station fsgy/k3 *nb(nw. 4 vmswagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the in4 . ksnv3(n*wg/fsymbitial 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 directid 31uh1aoq- vv(/eo xpj7x3kzon buries itself in a 2.4-kg bexv731-o dak qz31/pxjuvo h( lock 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?

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 collit/etla k f:4*m-vhu.hdes with a 3000-kg car traveling at 60.0 km/h south. The two cars sti *-ute :lhvh/kftm .a4ck together after the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h emzhf6ckkhq.:- 05cfpx.-aeimo sj+ q;po 0l 0 ast 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.) What is the direction p+f.hh0kp qc 0 mc.l xm0j-ifqek: zoao-s ;65of 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 lek /wc m3pdq2m63qyf c0/ryh8 ovel 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 magnit8 302ykrd/qpc y w3fqmmho/c6ude 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 wn -65uj6nikft t.mv otl 61t4;4x eodiith a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west withkj4 6-tum1. 6v inei f;ototxtl56dn 4 a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 106n)bg7j c p235aqvbb w.0-kg mass sits at x = + 21.0 m. Where is the center of mass on tha7)56gbwbqc 32j n bvpe 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-particd mv, ,hjr7jd5le system is at the origin. One particle is located at (3.0 m, 0) and has5 d,r 7,djvhmj a mass of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0), 2.0 kg at (gtw)fi/fo3tt0 w bm;)2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of 3;gi tmt/ wf))o0btf wthe 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, 2di. :f+iz l (/pq1e59rw mbzhc.0 kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What iifq e(w d/:ri.z+zlpb1h 9 5cms 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 1.04un2vxj. ,voj. 83tkz4erd mi -kg 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 bei4ikztvd 23eonuxm 4rjv8,j..ng 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 positiktg 2jql2 4c1aon of the CM of a whole leg including the foot when the leg is stretched straj1g2lq ktc24a ight 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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