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

1#

What is the SI unit ofm 4aqm+cfo1,dww 7v)i w6b byf+kw(a8 momentum?

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 cannowl2c 3pnl 2+rcj1 ps8gnball, 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 leveq jf*7y5 h2x(g6qmh r 3ojpzvl7ygb*/l railroad track at constant speed. The car is open on top. A large logp7yv*jq*xz5 2 glq/r3ohh6f m(jyb7ad 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 frictionless icdmmdd5 0 z3sq;:hwi3y d pt/0ce. What happensdpc 0m ;35h0ymds/ qzdwi 3:dt to 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 equadwl*9tvld +-ck)e1* +kgzyl r l mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. Twr*-+d19kz )y evdlgtcl+k*l he 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 wh78 ud4:rna 1 e6oauevith a momentum p. How would you represent its kinetic energy in terms of these two quantitie e u8:rev61ahna4oud7s?

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 thep790 yn 9ae4 *fyzz9bih ysl (tm88mjm kinetic energy you gave it in the previous pitch, the magnitude of its moh84am m*0yjt(bmpy989 i nfzl ys7z9ementum 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 lz j1i 9lku/9yqr6s8 mptha:0aaw 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 conservationne jn;+48k m-kawkg, e 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 n wb z2 8yb)59fudn0kg(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 stpc,o,4fo:0w qpdzb n)atement?

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 collision. Which of the bs *rsdc62(23fzcdpe40 (zjvdlbzf/i,3aao following statements concadsi03a/2 bb(fr c2e z,dozsc lzp4 *jv fd63(erning the 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 dropped i,3q a-wb,s c5qsrf2o from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected w qr,5iq -cf b3s2o,sato 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 wiy9 mnid)sks w8- :zmeq2at.w7th a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magw ):dw s-i.m987yqm2k sznaetnitude 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 bv8mm tll,(wl+ 1n+l vcysl7e2;,xdn tounce 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 right at 4.0 m/s. It cp rz.b/+am+fu,3 tqycollides head-on with a 6.0-kg objecqpu+ty, +. /azr3mcbft moving to the left at 2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker movinz/aj:8tczqcd o coa6js (x9 *c.m*;og g at 2.0 m/s tackles head-on an 80-kg halfback runnio c d6q .*z;(z am8cg:aj9xcos/jc *otng
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 the folfc,k63 yv/)cf ; njgp)gfktf9d7h +uplowing statements is true abo t;kkung37d ffc), vc 6 hfp/fgpy9)j+ut kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conserved 5vlirq;e s t: sk j/sb2(s(f:,fi8qxt?

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 batbu+o oo8f 3:gll hits the #5 ball and stops, while the #5 ball moves away woo8f bu3t+:o gith the 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 m/s c , 1;6 a) 3xa*y8xecwzdjlohrbollides with a heavy exercise ball at rx) ro;d e6x y1b,lahc38jaz *west, the beach ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in mp 2b; clwc9i 0 )srz tc6.veey/x-+mka head-on collision with a stationary bowling ball in a friction-free environment. If the collisiow m. )c+ sliye 0-mr9exkpctcz/;62vb n 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.x t76vfwtxrz 05v .v.w0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the coll5x r7f v..xtw06wvvtz ision?

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 mo:s qhto 4 5):j yo09tbrlj(egcving with speed 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 do(0h r5c9ysj4bet:to g)o :jlqwn. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v co iys2jhab +b829rfg*ip j2t tv5 fz9*tllides head-on with a very heavy object at rest, in a frictionless environment. The colligryb92pv8 j at2t t+b9 jzf2i*5hs*fision is almost perfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s collides head-on withd1snx7 ni 5-gccskh..ry+ thv k* xc*; a yellow ball of equal mass moving with a velocity of -2.0 m/s.*n-d vrkcsxktis;.75yh 1xgcn+c h*. What is 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-o;* apd w uucmoqn 6kd7(e1/st8n 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 iaomtu d c* q(;w7e1/nsd kp8u6s the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, then which of the fo0 e8jws4rvc b0llowing statements is true about kinetic en40cv ers8 bj0wergy?

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 .*6d.dz a6t+q ob9 ,u zvwam ry0ni7psstick 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. It collides in a perfectta// gm;nphv86 xp4uwly inelastic ch/wampn xu 8/6pvg; 4tollision 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 objectozm ..ofah,)r experiences the .zm ,a)roho.f 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 qrauw2h c y yb;qc4 /,t-v1;sndeflected 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 state)s kw(8m eklu/ttprowf-x ),-ments is falsewwlxmks, rf -)epu ok)t8t-(/?

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 fa qw sr).)cm;jslse 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 o vei(,)h no;f* t(zlhin 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 dlz0d cbpe)k).1z5r7 yvczs ,bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just afc. yl)esdk bzp1v50,c 7zd zr)ter 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 collisag+m:- t7ato vx/up .mion was completely inelastic and both cars quickly came to rest during the collision. What is true atg7x. -u:mpa + toa/vmbout 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;+qk y xeyws:rsu,)n2 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-kg3q :ejmu k3)dd 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 moving south at 20 m/s. What is qm+ej,,1cl yc the magnitude of its momentum,+c le cmjqy1,?

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 ah+(bev)/y dg u height of 12 m. Its momentum when it strike v/h+y dg)be(us 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 to each other. One )kxw;s 2q7njkmoves with a sx nk;k7) q2jswpeed of 25 m/s due 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, travelldnpv x-k99 0uv2l :b;qxw3q ying horizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentum of the ballk2l3 v9ywxq;ldnpu : 0xqvb -9?

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 by av8gvm wo 9:p)n racket causing it to reb9m pvwn8g:)v oound 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 tc;ywn:ddy ,i.o r72or 75vyr7kz5zuo he baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible yzn w : yro7ordkd5czo7.y 5;,vi ru27friction.)

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 spa);p q/pmlu j1ace-walking outside the space capsule and is stationary when the tether line breaks. As a meal a)qpj;u /mp1ns of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the 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 dnb.e/n, :rd tapproaches 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 the large object's mo.dtn n ,erdb:/mentum 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 (lfj q;rgh2::9u (nzjcn2 c f7t40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you bot:ufrj (7c2;c n j 9qgzfnl2:hth 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 tqfn3o uhpdi ;w6c,*q6 4b,op co the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the collisioqou,dof n ,b pic pc6;qwh346*n?

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 stoppe 239d ldxmnmj+ subtzi2d2 kud(q())yd car that has a mass of 1500 kg and they stick together. What is the speed of the cars after the t9(ln bu2jxum(d2+ 3iqdd)y) ks dz2mcollision?

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 ci eccymj ksc-1i.tp:8s*1a7)eek7g uar, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car,e*8cym1k tc-ei i ga.:ku)7 esp 7j1cs 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 fric* 9pi;h yzctf-tion on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a ;-h *i zypfct9distance 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 lo./ cz w);h4nhbh icq3kg at the rate of 0.80 m/s (with respect to the log). With 4.n/hbqcc);hz whk 3i what 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. Th. /js;/pw2wh (moatlk e force suddenly increases to 15 N an;m2o a/lkwp/ (hsw j.td acts for one more second. What impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net for cffvpc4 gx. t7k8gs2/ *uokgv30yef0ce acts for 2.0 s on a 6.0-kg object. What is the object's change ofxo0v k.guf/f82v7c ky* ges30p4tc fg 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 at 30 m/s u1(ifxvjl8i / 2gbxo+, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exoiix uxvlg28f 1jb+/( 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 pitched toagq(pzc/ h 8*h you at 20 m/s. You hit the ball back along the same path, and at the same /ac8 gphh *q(zspeed. 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. q5 p mjc9-kno77k jvxyir;f01 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 topfrmyiv5 k ;91pxn 7c70j o-qkj 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(ez14oc5so* f puu+r j.0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is tcezoro1u5u*4 j s(+p fhe 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 akmj8 zd/ei v5mr-y*5 6 wc:knb burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per secbjyd:imknm-5 rv 6 85*/zwkecond, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg 5 ue2r 0nwczf7nro8.s per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exee5zw . rno8cs2ufn0r7 rt 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, achievsjgt82yag m6g* xppc56uu; s 1es a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrusta65u s sg*6x2tg ;1ypjmg 8upc force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at rest in d*rgpag. 0und q7d7n6vu den:wxj f i w;57/q)outer space. They push each other apart. What is q)xwdu:i *;n nrd5q /jgg0nwp6e 77. u7dvad ftheir 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 s)x2b2 ryhvf) lpeed of 2.0 m/s. It collides in a perfectly elastic collision with h)f) l2x 2ybvra 6.0-kg object moving to the left 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 direct+;;x 1cbycs*ukor. qx ion makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the finx+obsryx;u 1q; *.cckal 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 at rest. The -9)a8ok: f dr+pa-leyq,yc wq; dx9bz6mdu d1bulletr-o;f9 :-y+ddyqm 68kzc9dexpb) daaul 1qw, emerges (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 j+,ahty9ki .tan alpha-particle (which consists of 2 protons and 2 neutrons) moving att+a yi,9hkj.t 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 with a stadu6im5+ yw7petionary ball of mass 100 g. The collision is elastic. What iwpd6e 57yi u+ms 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 cyf+ f,okya- dw .cb9,nh w9:neast with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfectly elastic.cn kdn y,a9f h+wbo .-9f,:wcy
(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 heavq(t 8 +o 2h:smfd-dbirh14jvd-on with a 3.0 kg mass at rest. If the collision is perfect82 : 4 v-fq1tvmd di(boshr+jhly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides head-on in a per )p qy)d/ :x7;je d.sarkuzfv0fectly inelastic collision with.ay7vkd0d fj ue )zq:/rxs;p) 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 with a velocity v, strikes a parked station wagooy6o12p 1c0wzte tu;l n, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kineyu1l1o; ct6 te2zop0wtic 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 verti /cypy tk5jg2(cal direction buries itself in a 2.4-kg b/j gtk 5y2pcy(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 eastzjrn:* ((e h69amahd1jcrl6s 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 se1rh rhj*m:ac9(a jd6lns 6z(peed 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 v-sr 0q* xlc9u)cv6ei65divs traveling at 60.0 km/h south. The two cars stiu dv6 eil*v cr 09-ix65)vscqsck together after the collision. (See Fig. 7-1.) What is the direction 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 a2i*-wwg x) gonuo5ha:uzuib+ 67 k7ll level 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 magnitwh2uxgu:+o uiwo*lng6 zb)k7 7 la5i-ude 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 / lq7(pgnliq8 m/s. It explodes into three fragments: a 5.0-kg flpni8 (qlqg/7 ragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a b *x* 9gsz7tnsmneeg*ok /0un9;7j d i10.0-kg mass sits at x = + 21.0 m. Where is the center of ij0tkxm * /o 7*sg9nn ee ;dsg*znu9b7mass 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. mzcq xvjv9*nhj0:n53 One particle is located at (3.0 m, 0) and has a mass of 2qx*n 3:zmv 9 n5hjv0cj.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 followsp6 ow1)m ,qn 4wstq6bo5xmo*s: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at ( s6w*p5,6wt q sn4mo1qbx)moo2.0, 1.0). Determine the coordinates 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, a5,ieb . ah)(nnyppq-l7(fwk2.0 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 is the location of the center (aie5 -7 b q,pfyn(pwkl)a. nhof mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is po7rn s-d*q u7d n9kdpy(sitioned 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 orindqd-p7rnu s *yk97(d gin, (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 ju); 1 -ljss8q xsta40pgsw o8position of the CM of a whole leg including the foot when the leg is stretched straight out. Assume the persq ss4s otu8xgsj-1l p0j8);a won 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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