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

1#

What is the SI unit of uhjfv);mapixir /72) 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, the cannon will recoil backcm3fw8d 3z9zmsjjr68xj 0r k8ward 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 frictionlel0x-tj mnya9s4-a(c dss level railroad track at constant speed. The4( ctjx m9daa0l-yns- car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on frictinasor vqv 6i4(1,x/xionless ice. What happens to 1nx ,svqora(i46v x/i 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 lo lth9/n6s a(a/sa hhb70j p-aump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearlyao a/sj(/9astbh6nah-lp0h7 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. How woulfyri 6tp 7 4sl94zzujlv+w .8pd you represent its kineywp4s+rv9 ftzllpui6. 48z7jtic energy in terms of these two quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic energy you gave it in the2l mb0phi9p7.tszj, w previous pitch, the mag7zh0w,mjpls .pit b92nitude 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 mod4bn:y(v nvp)sr) ch5mentum.

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 conservatvziy5 rhb66 dow9.wn/ion 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 Fvpapb.h 19ooa7qc m/ zg;)z9rorce 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 aas2tw; gk(n+ 5cf(vwuccurate 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 wa zcenc :(v/t9ith a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average coll ct 9e:cznav(/ision 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 dropq;t2il l y298j8ipz kaped from the same height, and rebzkyp l;8 it2i8jql92 aound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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 mov3fub s6 vwp .b)p--zyxing east at a speed 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 experiences the greater magnitude impufbsvy. ppxb-)-w6u 3z lse 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 eamh wsv;c)i ghex5(l18 rgwp .7ch 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 ay kb-l2x2 )peet 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Wxk2)y p 2ble-ehich 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/s tackles head prf zo 3retnad ;jff58.5i5jfl415gx-on an 80-kg halfback runni;zxp.fjlrfg4iarj8 5t f1 53o e5d f5nng
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.bzwkvi+ ck.x; d1o*o momentum is conserved, then which of the following statements is true about kinetic enerwob kck. +1io.vd; zx*gy?

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 co2 v ys7zda+ 5hs;c ik;*vn/ta lf:bklk1;ar k.nserved?

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, theo9nd)xix, o* 1a dmt5r white cue ball hits the #5 ball and stops, while the #5 ball moves 1*orx onx,m9a )t 5ddiaway with 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 rol7f ar684dgd51mak 0 xg amx-j2:oz wnqling with a speed of 6.0 m/s collides with a heavy exercise ball at resx fk xgdd 50mazn4:a2ag7-1wr8joqm6t, 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 a head-on collisi ta.ok(i 1,ltfon with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately aft. 1a lof,ki(tter 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 collicn (,(z6pkboq des head-on elastically with an identical ball at rest. What is the speed of the initially stopnco q6((kpbz, ped 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 collide7yz05 kjkiqk*s head-on with a very light object at rest. The collision is elastic*qkyj05kiz7 k , and 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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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v collides head-qyl8cwwo9+()ncl1 fgon with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collisi w+8( )cnlcf w1q9lygoon 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 velocieozhv4uf-- np0 s- oj7qu0an:ty of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. h0-afpsn-: nq0-v7 uzuo eo j4 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 col ,rs zj:g9tg+tlides head-on with a very light object moving with velocity -v. The collision :gjgrt+tz9,s is elastic, and 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 momentum is conserved, then whgufh 1bp dtm*j+-*c2 khi*ca 1ich of the following statements itd 1*f 1i*2- a jg*hpb+cchumks 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 togethl/x(a/0ki g trer. 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 oys.w vub3s(m;d jj7,/.xyx m4.0 m/s. It collides in a perfectly inelastic collision wity;sm xs7 djyuv.m,xo ./wjb(3h 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 aw5bvme 5-m/ja large object and sticks. Which object experiences t-mw5am5vbej / he 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 deflea ms7t.yrl7y;kd 5 t(ected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following statements is falyf86 .- i4 sdasnesu)dse? 6esn4idsdyuf)s8a-.

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 isky.sj3j 7 k;qs 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 flexible rod inx d 1l d*yow9pz.n3p,s 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 explodesf1hyoa,unxk;*ow j lv .-q09rsh0ls( before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explossfuhlvj ( -rw ylh*0,o. nkas9x; 10qoion

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 fricti0yq hj1) 0qsyion-free road. The collision was completely inelastic and both cars quickly came to rest during the collys0jyi0qh )q 1ision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

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

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law for a system j98mfqdwgc,,/gda* ms xz v4(0 jk5ziof particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck trawjc8/c 1*hjxnveling 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 i 2hkow bddibm;- p.j5*s the magnitude of its momentu d5d-w2 k;hjbio*p.bmm?

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 droppedkogr -7it- q9d from a height of 12 m. Its momentum when it strikodqit9-k r7g -es 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 perpendicivbf , 30e4(eudvt j8yular 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 8b,uf eeydt0 vi4 v(3jis the total momentum of the system?

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

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

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

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikes a wal .9cm2pbxak j;x 9;3;vdmvtw pdvag,,l and rebounds at 24 m/s. What is the change in the momentum of the t,,xc39mvd.b9k jg;v ;xawdamv 2; ppball?

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:nm+tz 5 t5qyxi9 h ext)e:3lx speed of 12 m/s, is struck by a racket causing it to rebound5xeetihx::t )xlnzm3+9y q5 t 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 machm fg0/pd* b+tlbn3eto0zv zg 685yxo/ine (excluding the 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 pito0gyo+/tf e3l *gbbt6 8n0/p d 5zzmxvching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking outside the space caplcwnx, 5 gk;t;sule 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 d w;lkn5 x;,tcgoes 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 headfeq:/i80aup)8 x eeq*b g 1aqp0 llbv1-on a large object at rest. The small object bounces *elqa/ : 8 gxfq8aqvbe0u)1blp10peistraight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg mas)fdn4hm n+ )01wmbtg3ogac)8*ebvh ds), who is standing still, with open arms. As you collide, while holding each othehg31+ebbn)gh n4mwvo0 af d)8* td)m cr, 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 level, straight road q+h+v :y- ytr*geku,kat a speed of 6.0 m/s. It collides directlu+e+ -ky, vyg:qr th*ky with a stopped motorcycle of mass 200 kg. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear of a stop+45 o/ c9b emghkqjyyybg 3(u.ped car that has a mass of 1500 kg and they stick together. .cy5ukbem34qb / g +gy9jh(oyWhat is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a level w7 ir-,rrjk.ttrack at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brr ijwr,7t-.k rakes 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 friction o2q o, etoi1vr1+o5vchn a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of e ro5ihc ,q+21vovo 1t4.0 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 rateu(p9w ,gbkn5se4 sml5 of 0.80 m/s (with respect to the log). With what speed does the log moe9l( sk,nmp s5g4ubw5ve, 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. -ub w:kayxy + bn*;lsu)8ia2rThe force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to rn8 *wubb+l)y uy2ias- axk;: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 *( qk3gs9pilt for 2.0 s on a 6.0-kg object. What is the object's change of velocitipg(l k*st9 3qy?

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 with a brick wa:jqb dk hyq-obe7j3o i;o.u3wd*id *;ll and comes to rest in 0.20 s. What is the average force the car exerts io *y eh;i- jqodwkq:3d.db;oubj*7 3on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back ag 0c gwbf,oyfg. p;c3jeo-k+38 gw6jglong 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 batj3 b cc - wwpe3g.8k;f6ogjgfg+,0oyg 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 righ eo di(-jh6j+jl5euvzd*;h8g t 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 fgl h ;jv6jj 5he+* dez-do8(iuorce exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a mu volqx7cr+g/*a n wr2*yrs,z4z0xt.f zzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average o / tnzyrvcax7gw r*f+r,qs.lxz204 * 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 doo7f1lpn / 9d jqc 6edbq:.ov0tbr of a burning building in order to knock the door down. This requires bdbdqf/ e:lpq0.6 nvt9o17 cja 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 drainpipe at the ratepf6ff:m i00u e0 vntk: of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what av eipfumnk:00ff6: v0 terage 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 masz o;.7a hz/jbvs 0.12 kg, achieves a velocity of 40 m/s after 3.0 s, when firedh 7aojvz;bz/. straight up. What average 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, a8j7in o :8fte6q) 2 uryhyn)d8.g lufhre initially at rest in outer space. They push each other apart. What is their separation after the lighter astronaut has movtq6.2:7hohj n8n)f f8lu gyeidr uy) 8ed 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 in a ppn ijwn7 lo:+3ob -da i,sc mm)j7,(foerfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What i:nnboi3 ,7lom7jf wc ad io),+ pms-(js 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 dirfix/ :)c 7hi( 0sgppvc7i/ikkection makes a head-on elastic collision wit gcxv0cs)i77ik/ip h: /(fi pkh 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 m/s is firedvsp9bx5./ a dn8iti5 v into a 1.00-kg block at rest. The bullet ei5di9 .t5n b8pv/xvasmerges (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 res, oq lnhl4at1gj *v3jcve07z7(, c ktxt, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If thehg1ajz07qntlcv (k o47*lext 3jcv, , 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 uj8 y qk+epeu9 t,rhc1y, r+v(collides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the1+,hu 89eqcj,y(+eu p y rrtvk 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 1mc r .r.efxb3collides head-on with a 200 g ball sitting at rest. The coe. mf.rr3xc b1llision 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 with a speed of 5.0 m/s. It c0 2fmmruhh/v lz8jdt)* 5zu8yollides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collisir8*jlvmuf8 /0 zhyut5z ) md2hon?

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 ov be5 -s.b6vxw myl5g m:jq;/sf 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collisione/bglmb 5w-6ys5 : v sq;jvxm.?

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 vech0x u(idksuy) w meq+83+rq1locity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in3+iek0qu )dc+8 hqsux (wym1r 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 directmo2my1w(h1ju 7ep *tx ion buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves vertically upw12ojxmymp 7e*utw 1 h(ard.
(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 collides with a 3000-kgh.sa2, q7gdvi car traveling at 60.q,.ida hgv27 s0 km/h south. 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 90.0 km/h east colli2gp93 icfb e)ddes with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars a 39 pe2gif)cbdfter collision?

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A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Objectfcek31. a 0wgn A moves east with a momentum of 24 kgm/s. Object B moves n .k3w0ngc1fe aorth with 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 mas0cy1sn3 k(y 32oa-sja j m,lpgs 10 kg, is moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment wsayj1,pksgj cmo(n 0y l 3a23-ith 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 m-bj * *o (xo+wdarc9bcass sits at x = + 21.0 m. Where is the center of mass on d+9cabw ( xjr-oc o**bthe 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 tk1uh)4 (1cb m 1tqlvyf 5jlc2gv89q ; y.crgunhe origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the sut (jch v4b) y8k 2.5m1vf1yrlc 9 1lgcgn;qquecond 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 follorx./e6t z3 f w.9nwjnlws: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates wf/ en.69nzjlw.r3xtof 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), (1.0 m, 1.0//8pt ra2q puwa,h4 me m), and (2.0 m, -2.0 m), respectively. What is the locationua2 wpp q htam//,r4e8 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, 8.09 7bpf0k9 +oe2hx kuvzl4v(sw), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the syste4szv e w0kpl9b+x2 k(9v 7uofhm 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 thra4xgud(nm9u9 / ixhv 5r5ow5 e position of the CM of a whole leg including the foot when the leg is stretched sn mwv ri uahg9 (45ruod5/xx95traight out. Assume the person is 1.60 m tall.

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A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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