Physics Unit7: Linear Momentum - 题库网 (tiku.one)

1#

What is the SI unit of momentumf3c. qtyr+1z1f7rf do ;9rrfyw 9lj2(eig j8r?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball, the cannon ccxv04a*n vo6 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 level raa 72jgzj5zna 7ilroad track at constant speed. The car is open on top. A large load of coal is72nj7 ja5gzza 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 frictionlbu i +kq/rmd)a8 ;xh+gess ice. What happens to the velocity /)h b8;kq+r +dmixaugof 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 thrownd2n2ng mi h83 :7clsk8ychy;9 z/cmcw with equal speed against a wall. The ball bounces back with nearly the sam wc/ :82hi nhs7n3y2kczmcmgl y 9cd;8e speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. How w e/ugwyc3u*zrg8pm- :ould you represent its kinetic energ:8uzeygu p/w-r 3mgc* y 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 baseba pztfewd,jgf7 0g-4q*ll with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum ff7tg 0qpdg jz,*- we4is

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 of2;vlvy7uu y39;bjm yu 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 moms1*uetfo .x 0jentum.

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 cupv47upa0r+vy h 4ky*f rve on a Force versus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the followit omx8ic/df7f9 q /i2cmw*:zgng is an accurate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes withb88 vgev3ii 0(3 dfy tuswt+h+ a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision forc gyvb 8(+0tus+8wf3ih etid 3ve 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 bl26 .j0ej m3 ack qd:duzirpf-)ue) are dropped from the same height, and rebound off the floor. The rukjm jd )6ae .-dzi2p3qr 0:fced ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, collid 743iu,)k 1xlowcdbr u yw uqk;s/-n0z/j4muzes with a stationary bowling ball. The Ping-Pong bal0n,k/sq rx/u4oub3im jzd7c k;1u-l y) uwzw4l bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

D. It's impossible to tell since the velocities after the collision are unknown.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce off each othe wdl0n 4xmqa.+x5)fo gr. 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 4dfxwrn6q-x:- uj- *kk.0 m/s. It collides head-on with a 6.0-kg object mkudf*jk6x -rn-x-w: q oving to the left at 2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/e3tcdpf3yxll q gskp2o-ccq7g6kp+ 75b( n4, s tackles head-on an 80-kg halfback runn 2xg4cc( qsp5pl 3 +ngk pbcod 7t3fk67-ylq,eing
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 collisio52qr4/6*t wygnugd7a cq 3za rn, if the momentum is conserved, then which of the following 4cr 3zqg*w2ngr/5uy6 qa7a tdstatements 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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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy con)otf j8 eip0n.t-ci+qserved?

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, while the/tyzoxt05. xj8c, m mc #5 ball moves away with the same velocity as the cue ball had originally. The typetcxzcm 5,.j/x m8 0yot 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 - suh rp5z63tf*edbw*heavy exercise ball at rest, the beach ball's speed after the co zwu-e*rbsp*tf 36h 5dllision 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 a head-on collision with qz9,; 5udl1uywgqf;t a sdgu zq9t;15yfwl, ;q utationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a lvfkf:cgh u w*pi-e2 u7xgpy;7 d*1.ospeed of 5.0 m/s collides head-on elastically with an identi;ex dc yvp-17.k2:pf* l7gg w fuhuoi*cal ball at rest. What is 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 witm-,ec f dko.r-h speed v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavydfkr- c,.e-mo object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v co7n*m bx2h2 hrn-wgy x9llides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. 2m2-xx7bynrnh wh * 9gThe 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 +u fob7: 8k*kub3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 bku k*f87b:uo m/s. 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 m-y;27bslbxaag-h v 7moving with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, andba 7mga7vh ;2y -slbx- there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momen3g,9vh 4 b/w c* ,bs*v ,oirx0smbhxixtum is conserved, then which of the following st,i/ sx,hb mc0hxb*xs3v vibgo,r*w4 9atements 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. Kin/3yyotsi k 9e6etic 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. I3i26fco wk-b8 nhiqd. t collides in a perfectly inelashdkqi8 62n.o wfcbi-3tic collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a largercw6 bl;7cv86 qenx8t object and sticks. Which object experiences the l t68r cqeb8c;67vx wlnarger 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 gadw;j3,3 vjmc 6d7o,2tp f:a m7fiv(pa4l t kis 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. Whictl-t(fsmq 0 :haq7d7v h of the following statements is falseq0m:t( qsva t7ld7-hf ?

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 8)qkq3+*kgpaagcy5 f+,bkhvt /:gc m is a false statement?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk with a long flexiaz)78c,heft a ble rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally, releases a bomb, which explodes beforczts q/kexn --gr)3hg-z2kc3 e hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just an-3)th ecc-xsk-gg kr2 /zqz3fter 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 ong2qwahil f*0y1)+ sew a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about thwi +f2gs 1aq*wle )y0he 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 particlet p+/qri/;ws ts.

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 trabmxb5l 9h(km )9q ia-18qkcb pveling 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 ths r i(n ffj54m v/sms8m/zc-4me magnitude of its mome z44j/m8nr5/mc vmsf(fss- mintum?

A. $1.7 \times 10^{-3} \; kg \cdot m/s$

B. $6.0 \times 10^{2} \; kg \cdot m/s$

C. $2.4 \times 10^{3} \; kg \cdot m/s$

D. $2.4 \times 10^{4} \; kg \cdot m/s$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 0.10 kg is dropped from a heigh2uu;h i p,ic-q1rjoe+zbkx( *t of 12 m. Its momentum when it strikes th 2-(1u zjox ,;qeuici*+pkrbhe 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 perpendi ,b4avwxwq/* pcular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momentum of th,w p/4qabxw *ve 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 u-:n ix 0de0pvkg, traveling horizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in p:duinvx- 00e 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, initi dd3xne2)ny ;wally moving at a speed of 12 m/s, is struck by a racket cau x3wne2n);y ddsing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is placed on a froz3rj p c5+ov;q;*zezghen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction.3gc; zj5+ zhv;*peqro 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-wal 0fucf+jq0p.r+s tus0 yvn,)sf:sl 5jking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg spjf.)u0 j pl5fsvu t+nry 0f:ss+s cq,0ace 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 ye w(5j7wb ht)large object at rest. The small object bh(jbw )7 eytw5ounces 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 y4*u01qmplst tour friend (40-kg mass), who is standing still, with open arms. As you collide, whils4lp0*m u 1qtte holding each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg ,):u+dz*m6 uls urd(qzkk +acmoves to 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 collisio )luqd,zk:u6da (+krz cm*s+un?

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 c blf (l:pfqb .m:*g2jm/ e-dnruns into the 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 collisioncdf /nm * mjl-(l.pgbbq::2fe ?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast ak74/bxky .;e9 2 tjpme 4vq se)pt+jxelong a level track at a speed of 2.0 m/s. It cjm2ex9tb+ vy.7s)tk pk4pqee x;e4 /jollides 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 26z 89(gp;udm,)9jggh k bf hjyfe.h/w00 kg, rolls with negligible 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 the car. How fast will the car be moving a uj8 .hm)pfgf,/ke(h6 dyzgbhw99jg;fter this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.80 m/s (witl4c1 rvz q3mt5z1t9jvh respect to the log). With what speed does the log movjc5 lt 4m1193zvzrtqv e, 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 forc:ot(2cer xu/hhrel 83e suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to the obje 3e:ruhh/tro82clxe (ct?

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 iyu*l)/s nqwcaz9z k2 4n3/isfor 2.0 s on a 6.0-kg object. What is the object's changwczqik)nauys/3/l*4 9nz i2 se 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 a levb)c0g 4k5t 20hcxit 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on t24icklvhge x t 05)0bche wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back alongbz.iz) mq;(5yrhdvx 5 the same path, and at the same speed. )bzdxr.imy5 z v ;qh5(If the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speeds of the ball reax)go d4/kabhmwd*1 f9pn-) a;5m hcight 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 the ball by the tab mxa*n 1-a4 f;pacw/ebm)9 kg5 odd)hhle 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 35.0zf:t 8zv 9c.ff zzx5eye 14ga8 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is thzyf g t9a4 1z fexez:v5.8zcf8e average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building in order to knock6 , zphxtk88k :v lbn4xqodu1/ the door down. ,8x8x kn zdvq1hp:o/t ku6 4lbThis requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water 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 -b n is;2nt ;4k l01btlbs(8)uxpkimddrainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it ext;;s (lmniix8bt1kl- b 4 snukp2)bd0ert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/s after 3.0 s, h:uyz9x*j l sesro:g4r9n;w1 when fired straight up. What average 9nrrs :x9*z1o;y e gh4us wjl:thrust force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at restxnh/hd5dh3t 8ro( yj/ in outer space. They push each other apart. What is their separation after the lighter astronaxh j8//h h d35rtdo(nyut 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 of1lr367klk12m pt+gepo0v3tzi hz . hd 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg od3it+ph1pkr el. 1hotk0m23g6lz7vz bject 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 directionuy w59fh ) uj,li 83cl /c5ow3oak1qwr makes a head-on elastic collisioc ka53hjic )u,8f r/53w llq wyuo1wo9n with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 gug8jja:ed *rno:x;/ m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is :nu8xg/jj;* e a:dro gthe 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- 2ic80 rh8l d.p7/fv ick*iylton by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equac8 i/lhlyirt0dif k. c*87 2vpls 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 w vnt03sk-.ce0fdd9ntgg c:k*ith a stationary ball of mass 10 gnvddcg3f t0:nk.9ktc0- se*0 g. The collision is elastic. What is the speed of each ball immediately after the collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.70 m/s colli 92sd,ms mu3iw -xns7x gkm+hmxz(- 5cdes head-on with a 200 g ball sitting at rest. The collision is perfectly emms7(u gzmxs9 2iskw-cm-3,5xn d h+xlastic.
(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-on wg :wagwoy -(+:ooftr3ith a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the spee:tgfwoo r:gwy+-a o(3 d 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 speej.vmuf*joi09 ehw13id of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. vi*j 9j0 w.meu13hfio 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 withkk c7vzdmbomo*8a*wa8;la 0 t 4m(t9h a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What f8am 7k94*hoat (ld;o cvmb0az8tk*wmraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a verti+f8mwa1rfd qvw 7 ;iz2cal direction buries itself in a 2.4-kg block of wood a rest directly above it. As a r2d1 ar7 zw +fmi;8wqfvesult, 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 3+0d tovvkhf-xb ko (0at 90.0 km/h east collides with a 3000-kg car traveling at 60.0 km/h sout0+xo0ko- bd 3hf(kvvth. The two cars stick 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 bp5f-x .jtof3.0 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collisi f.5xj3t b-fopon. (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 a level frictionless surface. Object A mjnh.g+q.k+i o:xv m q u2cq5,voves 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 momentum after the coqxnc2 q qjmi+kv 5v g:.+uh,o.llision?

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 sf. -v 2dx0b5 ctnrqu7toward 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 a t5qnb .vfu7s20 r -tdxchird 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 sitslg d+ a 5+(khr7rz/lb56lzjv x at x = + 21.0 m. Where is the center of mass d5 +hjl+6 5vxlr7( brlaz/gkz 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 o b/od fh9ya88a two-particle system is at the origin. One particle is located at (3.0 m, 0) and has8 / 9oafoybhd8 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 (2.0, 0),ubj/kp z9cs,u,sg o0+ and 4.pgcojubu /z+ks,9 s0 ,0 kg at (2.0, 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, 2.0 kg, and 3.0 kg, are located at (0, 0), (1;o ,tvxzy;w c4.0 m, 1.0 m), and (2;4v c; zwxoyt,.0 m, -2.0 m), respectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1h3v;0klk 3+ yx d/ydnz.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will rev k3 +dx3d;ynl/zy0hksult 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 krn.kmqt5a)90- qcah the position of the CM of a whole leg including the foot when the9 nct-. 0q kahm5kar)q leg is stretched straight 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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