Physics Unit7: Linear Momentum - 无忧得胜-网上国际课程 (5edu.win)

1#

What is the SI unit oh)zmo74 * gopqf 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 cannonball,xe(n*ul ,c7xf,l il yks3yc-2 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 level railroad track at contl;kjezi)dl e0k 6o-lc2v3y 9 stant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to kze vtel 9)ojc60i-dl3; ykl2the 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 frictionl 0 *rh/r4 4 ek/dlto2p4.kv .gxjrbbykess ice. What happens to the velocity of the sle4re*tv b hkjpgbk.lrd20/kry./ 4ox4 d?

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. The:ooz2: kylkn k+8f4 fey are thrown with equal speed against a wall. Thzk4fkf o n+ yle:8o:2ke ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. r. :rx silk27q How would you represent its kinetic energy in terms of these two quant .xqiks2:7lrr ities?

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 basebamh/rnj8l7 kinw): :full with twice the kinetic energy you gave it in the previous pitch, the magnitulr7:huikn/w: n 8 f)jmde of its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of mom: 0or rje (cuh68z-nepentum.

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 conservationx bw dj 4(o0a),giynp4 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 c aom+oogm3h6io.66dp ptujss7 v6,2ui; (c oourve 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 following is an accurate statot rt.g ho3/v g:qyd;z 3f5t3aj xu8;uement?

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 truc/e;qhhxzkcq 7z)3p(dvh /h y-k in a head-on collision. Which of the following statements concerning the magnitude of the average collision forcz 7;h3dv-)pk zechqh q/y( hx/e 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) wv9uyrtt fgv)*3r g 2;are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of iy2 vrv3uft;gt wg)*r9 mpulse 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 sp1fsh1d sutzvw e6(.2z +xr8vueed of 4 m/s, collides with 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 experzses r(+6d x.u 8 fv11vhuzt2wiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

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

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce off each other.1 b,xw y.(. wmb.o;n+nss zg8nexf q8w 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 collides head-on kbbyn+1 eka.0:6n ovq with a 6.0-kgbknbq y:v6eak .n0+o 1 object 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 moving ata it m:3d/e:zb 2.0 m/s tackles head-on an 80-kg halfback rt :ie3b :dm/azunning
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 thet5(9tyh h /; a9t9p taxwado)gtu2n4d following statements is true about 9p wud)ta o 4y2/ 9tg5ta;(nhaxd 9thtkinetic 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 conservedrcws; p/9,+mqxl-avh ?

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 g z(8fj7ob1hd1s vs+ocue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of cos b7f8 d hojv1+gzo1(sllision 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 header vxvvm)sa0-7h )+fvy exercise ball at rest, the beach ball's speed after tahfrmvx )7)v+e svd0-he 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 3fo q+--m *etvh.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the vo* tf-hqm+ -ecollision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on elastically with an idenu* gq b/)bprq+r636ijinu 4oj tiq/*nq4pb 6o+ 3jujrriug )bi6cal 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 with speed v collides head-on with axvf46agzv 4l z lzv97: yl2o0a very light object at rest. The collision is elastic, and there is no friction. The heavy objev2fz:a9 ylvzo 0 a74l64xvzlgct 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 co3gd o5ir,6f mbllides head-on with a very heavy object at rest, in a frictionless environment. The collisi3bdmg ,r6fo 5ion 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 with a yellow bali7 ru9vcymtw y* 4j c.ngpjxqon;7.9y4m7jp )l of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball upnj)cjmqy47nm oyr. *4vj7x ptywc 9; 7i.g9after 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 velocitbo lvvian-wjd 7m1 s1((rvw00y v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy ob70(1bn01(iv wjvlom sadr- vw ject 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 momentum is conserved, thmo1resuvmg i*ip4i;rq a*ln; a, ;-yp0 r32oten which of the following st-ap*oo l2a ;pn;emi;gm4*r0i31stuqi ry v,ratements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. Kinetic ener--9sl;9qafyo)u h 4zto+ g q+z9ng acegy

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 cot1 gmfn0/w0hz llides in a perfectly inelastic coln00hw /fz1tmg lision 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. vylxt e-giaz t692-( o vv:*mfWhich object experiences the larger magnitudtgt e vvz 6fmao-i*:- (9vl2xye 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 deflected kbl+;q c( zma*iz-);wyek4w(gq f.,juky 9 jeat 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 following9avfc 2 vfx,6k.fp p5z t/(jcw statements is false5(v., xj 6fp2f fkacvwcz9pt/?

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 statelj gk imp cgnvg i:p9qnz: 0mj.7l/)30ment?

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 flemvxtf- *j(hborweb6by p0.vz5a. 5di e ,+l j(xible 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 e(v7y2 0mz*d, er + mmn:qzkgyuxplodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the y02zqdnk yumm+re:v(* zg 7 ,mexplosion

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 frictijy;gm8pwk,o5 gj d)u(on-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of ma;jkm5y o),ug dpj8(w gss?

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 sysw k;har4) vnw6tem 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 2000-7hzoxto,( , nokg 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. Wii afag3(1cy3vxpeje2d :8 -what is the magnitude of its momen3xe:ig(efj y2- a p31widc8vatum?

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 ze5h34woso kz:0 yl d,kg is dropped from a height of 12 m. Its momentum when it strikes the zdo0he3 w,l4 kz5:ysoground 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 kha iyl *25e4tabv3m8 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 the 3il 8v4*ht25aemby aksystem?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 l xcjb-)lfh;8 m/s, strikes a wall and rebounds at 24 m/s. What i h8xjf-l l;c)bs 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 ball06/h+m7jvdqixr(7v oft/o2w( p nbje, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the owr( ixof(2jmdqh vbto7v7j/ 0pn+6 / epposite 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 baseballez m/xe hjik00ar/q (+) 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 0zax rj//( eiqhmk0e +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 spaw7e+ 3ak pk5c8gpt.aog2h5)qe q1iu oce capsule and is stationary when the tether line breaks. As a means 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 towarotagg)cqw1+eh8. 3 2 io5p kq5p 7eukad the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches head-on a large object at3qpdn/205 :ckwwz:j*s df /ogzcu,pi rest. The small object bounces straight back with a momentum of magnitude 4.0 k :w 5wpoqd0nfcp c sj:u3z,2dzikg/*/gm/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 g+)f2 :u camajto greet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding gac :uj+mfa2)each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the right along a lqtj9zcw, h,.ro+j) nkevel, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcyo+ jk,c r.9nztjw,) qhcle 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 traveli69rbyc co68hc ou /h.sng at 25 m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of ho.8s/c cy rubh9o66c the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a leveqi g.o9v2kpmir* m7cnkk): 2ol 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.c:rk2p mk7o92g *imvkn.q) i o 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 fricl6qwd7 hle b:shnu5b +-1 xfc2tion on a horizontal track with a speed of 10 m/s.cfux w l: e61hbql-57bnhd+2 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 after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.80 m/s 1rek cs*1 rkvn0d h:c7(with respect to the log). W 7*dvs n1hkc1k: erc0rith 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. The force suddenly 2 t.f 08rx ronmkd2.h, d5*clu;nl8mzgxprj:increases to 15 N and acts for one more sgo8j zr2kth xrf ln 5.mx2d d0,u.*:;l rp8ncmecond. What impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0f)ffun s8ps+pf ,sr)msdr6+r p c8 q*4 s on a 6.0-kg object. What is the object's change of velocitqspfp d+f+s rc,8) us8rsmff*r)n46 py?

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, collides wite;9:f ic)j4v+6 9:fucn j4ojompva ms h a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on thp6+c; 4fcji uv9:j ao moes49fvnm j):e 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 ;os *m:d8))bi-dyuvywnh /ku. 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, what is the magnitude of the average force the bat ehyy d)sndi) /vk*muuo-b w:8;xerted?

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 ontz 0kehhdv7 d+pyip *y) xz,:d+o a table top. The speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the tab +*k,d dx0yzz+ 7vidhy:pe )phle 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 kgnk)j +5klgijs1 ns 2e0tca*8w, fires 50.0-gram bullets, with a muzzle velocity of j0ial) ke*5+2nc 1jt8gk snsw750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned os49/ kwipsg ;nz.xpv) :aod byrnu+67 n the door of a burning building in order to knock the door down. This requid .6skain)4ygpb 7ou 9:/r nxpwvz+s ;res 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 hzq s6kc7z 6t543xpgrl orizontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesp k766l43r5 tcqzg xszn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg *3;0p3iftaiabq d/q v, achieves a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force3 qi daft/* 3apbq;v0i 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 outer spa bk2qe 2ekfrj:3 1pgx1ce. They push each other apart. What is their separation after the lighter astron1kxkfj b:e2p3r ge1q 2aut 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/s. It collides ilnhx +*/vuvc +n a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the tn/+ +lxuh*vvcotal 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 t;*rlc0qt; e +zs *lvpa velocity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What v;+* s0ltz pqtl;*r ecis 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 3005xj dc.,je7vsf 0/fkq 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 the velov5j/q. e,7fjsxf0dck city 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 alpc hrzuz1*z5 0rha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-parthruz50zc* 1r zicle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides h)l weg9xv+ 6pd7cf6gxl : kmw)ead-on with a stationary ball of mass 100fl 6l:g+6v7mgc)w)p d x9kwex 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 wit0(hgga0 i0 jgeh a speed of 3.70 m/s collides head-on with a 200 g ball s 00g0 iej(ghagitting at rest. The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves woo;w9t4gfo 7ps.f/y r ith a speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the spees 7;g4.r t wo/fooyfp9d 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 movingb(yqasmi*96xu9x hsc (a jh0 / to the east at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg ma*hxah ss0 99y( j/6imbca(qux ss. 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 wagon,w fb)4** 8ixodyr j:lz who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial*)j x*: 8oy 4fbdwrizl 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 w;i8u+0b ; qqjid yi,fdirection buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bul;q8;yi fbqjid i,+w0 ulet/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 collcn5fgb tn)*ss ps 4e*7e4g6,ra l)culides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) Wh t7 c cuns **6lbl4negf5)s)4es a,prgat 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 k6 m8wbglv )b 5m2k6ca:djd: zsm/h east 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.) Whatd85)b6: bv zkcj 6sa2md: gmwl 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 levell+x; x+eyc4 2nmsmvl 9 frictionless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north wmyxxvc9 2e4lm ;n++ slith momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a velocity of7d/3g(i1 equs bflae; 4.0 m73gl1fb;/idaueq(e s /s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air 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 or,92p gzpl , mw(firt)zigin, and a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass on the x-a)f ,(rl,wt2ipp m9zg zxis?

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 uymgq m/8el79hd4xb/ the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the 7 xem4/qbum yl8hg/d9 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 ac p-v8z7brp6 us follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2pcb87 p6z -vur.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,*ylcdf ba7guc *z5.pv 9n +p/z and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), rec.5/ udzv ypb7 + *lnfgap9zc*spectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg wrj 96heu(c kep 8ckw3y76d i.mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses being located at th 6jye9kc.3c7du8 e6iw (rphkw e 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 calculatxr v7 / zmyywwa (fys) rv.7997ysyfy(e the position of the CM of a whole leg including the foot when .r9 (f97m(xy) ysryfs wzv7yywav/y7the 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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