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

1#

What is the SI unit of momenn5gsxo );ynkp 5xb. 92q.h fqitum?

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 0-iejkx w9ly t1gbjdr v6zl, r+b.-0f 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 tr.7vvmbh5 ib /cack at constant speed. The car is open on top. A large load of coal is suddenly dumped into ti mh7vb5b. c/vhe 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 slei.7 s0 v s3;bazim+oori*;yc kd while sledding on frictionless ice. What happens to the velocity of tbo iy amsc3+s; oiikrv; 0z7*.he 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. T bmfh4jupe k2q l7c7f*2+b.aio1b(johey are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with wq +ulak bj72b2ojimb o*c(p.f f 741hehich 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 would you rfbvgda10* o2/v8vgdddix4n .epresent its kinetic ev.afbg01vig dd*/n8 o2x 4ddvnergy 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 energxtl/ 3bt sif*a3: e h8dd3y-sqy you gave it in the previous pitch, the magnitud*t3/h-yib:l 8s3 qdtf exsa3d e 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 8 t.hfv*6oov gn4qh+bmomentum.

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 oh2e,m-2-twbon rl,a q f momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (oh:a ez) d 34yzr;s0ytF 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 followin(4hrn ftscw+d * i-mx:ots)27fmh8o b g 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 with a large truck in a head-on collision. Which of the o3z*bogc0pl6qt0f k 2following statements concerning thek02flpo3botzq 0 g*6c magnitude of the average collision force is correct?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

C. The small car and the truck experience the same average force.

D. It is impossible to tell since the masses and velocities are not given.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one red and the other blue) are droppejvewrtjf 50 -p s,/b)lfl9 ;qwnl/+f dd 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 impulse during its collision w+w 0tqfnjw,f-)j/ b; lfv/ drllps9e5 ith the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, collides wo /g1slbw3o3. u ydpw0ith 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 grea uld0w/pogwo33.b y1ster 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. Lbz(rqm :/yb-2x7bxr: zsx.3 r0la gz zinear 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 he wtvf x0fmx6j8b ;4m;nad-on with a 6.0-kg object moving to the left at 2.0 m/s. Which fxx bw8 m;t 4jvm60;nfstatement 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 morumwl(av;0e 2 *erterf 3 e4m*ving at 2.0 m/s tackles head-on an 80-kg halfback rfmmu;*vt3weee4e* rl2a( 0rrunning
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,0*u clnqun0j p vg22f) then which of the following statements is true ab2)npj c*u0glq fnu v20out 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 conservedy90*a j:s( siezvgd7z q,1cic ?

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 stdaiq2 n5k+m, kops, while the #5 ball moves away with the same velocity as the cue ball had origiqnk5 k m,a2i+dnally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.05slh * 66fedbpv; 3tnn m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, approximatel66s*nbde;fnp35 hvtly,

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 colli,*cy2k cv9gxn-n lm3qh6zl f) des in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collis3 fz*,9kylc xm-2l6cnhgvn q) ion 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 collw * q:v5)rjgvnides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after t v*rvg n:)j5qwhe 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 a very ligh 25brx*ry0-8nk6lc ve0 hsdhxt object at rest. The collision is elastic, and there is no frictionx y 0b5e*20hxd rh6vs8crl-nk. 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-on with a very heavy objegmm8+;wst94v bn o2yw ct at rest, in a frictionless environmt w8+nvb2 om9 sy;wg4ment. The collision is almost perfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a veloug)l5i1ym2n lc c/ad:city of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the colli15n ld2 gl)cymc/au:ision?

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 movingi ut7: 2-so0xpq v32crxfmt(s with velocity v collides head-on with a very light object7p0-r( suiq3s2fxtt2 xcmo v: moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the 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 collisiopz/wdts 05d61hab 4p(je3sob 7mm6 pin, if the momentum is conserved, then which of the follo0e7mtd 3(ahbsj6m6p 1 o/5spwdiz 4pbwing statements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. xtax wcse7 78y4sj((a 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 u +bxv(p8m97x:sxen f-wgi6w dsp s5 24.0 m/s. It collides in a perfectly inelastic collision with awexsx85g6dw s2(9 np-uvp+s:mb i7xf
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. Whpadm67-)tz4bfb v: yw ich object experiences6 f:74paz w-)ybv tdmb the 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 defleru134ss- 5hdwv c++x dayw :nlcted 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 stath 7vo i 48 y(cfpf.c9vognp-3vements is falsepo-79.n8c fvc4 yp of3vh(vig?

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 is8 dxge4j5,n8+ ei8ts .ua,y,ofkox uz 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 in order to- wy+l+k16cq;q;gco ydp(ijm

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 h, 4-sk3 iop1/qd glzzbefore hitting the ground. Neglecting air resistance, the centesol -3 gzdik zq4,h1p/r of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-free road. The collisp7f ljlo t6ky66jwv8ngo 0:c; ion was completely inelastic and both cars quickly came to re7;lyg60o6 tlkcjpjn6wv fo 8 :st during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

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

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law for 3mjp19w i jknb p5-xhh08v+lca system of particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck travelingt dj4jv wy1 le-)vupx.a* .(rs 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 z.m12 pu2 quavm/s. What is the magnitude of its moment2.um1vua zqp2um?

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 heigz/b2rfe w ;:8vyf( kgrht of 12 m. Its momentum when it strikes t:e gr 8(2yz/frbfvk;w he 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 aremvw;n:7 f iu,g moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. Wguvfmwin 7;:, hat is the total momentum of the system?

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

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

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

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontp(rwzwch (w w3.7 zu8cally at 30 m/s, strikes a wall and zp.7h3ww cw(zc 8(u wrrebounds at 24 m/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving aoopq x7rqffkrp9nbm7 b 0f w,)7.5o z6t a speed of 12 m/s, is struck by a racooxb6qq9,n5rbmp 7ff7wzf0r 7o .kp)ket causing 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 *p1hqh l/a 0c,k5oqq bbaseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s q,oqkhcab5 hl*1/ qp0 in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is so n572dan 8dur( blx5wpace-walking 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 space hammer at a speed of 14 m/s away from the capsule. At what speed doeao(dd8nxnub 5572l rw s 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-ovt l5;jrfb :h8n a large object at rest. The small object bounces straight back v:tb5r8flh;jwith 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. kgjobcwy 6qzi 2)8y8 4.0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As yo)qw2 og.68i kzjc8yybu collide, while 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 moves to the right along 1lf;1q gpnkno.i5 jo*cg /5uta level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle ok 5o.io5pjtg cqnf1l ng ;u1*/f 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 reavg- ;av4gj2 muqm;/gur of a stopped car that has a mass ;2a qjvg u4gv;m-u g/mof 1500 kg and they stick together. What 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 tra eaand,m:-c n1a-8stgck 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 releaan at --dgsecan8:1 ,msed. 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 fri17 rz 25mjnraw wt4 dwtkpmu6 2k/w22pction 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 after thi 2pwzp 64nw12 w/dkr2mmjtut7war5k2s 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 mn 9n a41y/tyxk bw9g zydd92h(/s (with respect to the log). With what speed d n y(99nykhy94x1b/tzda2g wdoes 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 ob rjd:b9y g pol+-.vs3 7tyw08cy-caxbject. The force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forcej-dy rbpyc cg:-9 .0b8s 3+t 7owyaxvls 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 (-ec 1 yh/q1tsarpy5n acts for 2.0 s on a 6.0-kg object. What is the object's change ots1hrc-qy5(y1 e a/npf 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, travelin*xup5 1w-2 l3wc;n mllwp4zh ng to the right at 30 m/s, collides with a brick wall and comes to cl3xpw4l-wpzul;wn hn*m5 2 1rest in 0.20 s. What is the average force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to k)xm9r bod d57you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball f 7m dx)rk59odbor 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 ontoncxnk m54i; t4 a table top. The speeds of the ball right before and right after hik;c44m xn tn5itting 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 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 bullem-l cbfio +gc wgyx 25y:qgmr+p- 0r) 2i-wt5vts, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted otyoig i:f)qwcvp0c5xg2 rm 2+-+wmr - l-y5gbn 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 )j ij:9f-n shtt2dcr1 order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity)i9-sfrt htjj:1dn2c of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kgw p,l)ntaq +,s per minute. It falls 3.20 m to the ground. Assu + ,ap)ltqn,swming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velekc8 6 wtjfg,9ocity of 40 m/s after 3.0 s, when fired straight up. Wf g w,e6k8jc9that 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, are3at+f9mr 7lst28nlzuxj4x 2 s initially at rest in outer space. They push each other apart. What is their separation after the ligt fmtslux8s729 2xln4azr j+3 hter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the rightrx crfccu-nufzi5 ,g,z7z ge;;m*1; q with a speed of 2.0 m/s. It collides in a perfectly ela 1zif;m n5* gr,xfque7c-cz c r,;zg;ustic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x vo w g01rt byxa316ss2direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kgxav60y3 r s s2wo1bt1g object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired iniq;thu ex0+ h3to a 1.00-kg block at rest. The bullet emerges (the u+hih03qt;e xbullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an am)anz4i2t(7 v / memkxlpha-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 equals the proik7nemv/am(x 2zt m) 4ton'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 co*.c7,llgi5,ty9dz*unwac59loa y pbhv g f8 5llides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after the,8wh5,fliulza n 5 7 *gdvt.9b*yp5oyccal 9 g 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 sl6lh iqh7y1z::ui, keast with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collisi7y l 1, hi6iu:hlqskz:on 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 s+fyb n5hv,/5wi8s b iepeed 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 speed of h we +/,8b 5fybivis5nthe masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides head-on-walp a -ov7m8.toq q( in a perfectly ine7vomltqaoa8-q-.wp ( lastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station wa4lspd5 yd8t27*t zpub) kpj;i xbw n21gon, who's mass is 2m. The bumpers lock together in this head-on in72zk2juywd tbn5p x8td s;4pibp l1*)elastic collision. What fraction 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 vertical directioczrn oum9.i-k;qb31o n buries itself in a 2.4-kg block of wood a rest directl z ;-rk3uo19oin cm.qby above it. As a result, the bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

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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-kg car tra2)b z*kidbw kjhrx759 veling at 60.0 km/h south. The two cars stick together after the collision. (See Fig 7rdbjz*29bk) w khi5x. 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.gkonc,zxo( xh dmk,t7 .4l5 r:0 km/h east collides with a 3000-kg car traveling at 60.0 km/h souxnr:7 ,4 o(dmgkt. c ,kz5xolhth. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless sud/rk+j ff a0. rj+(xpdhe57uurface. Object A moves east with a momentum of 24 kgm/s. .u jdhj prdf/+k0uaxfr5(7e + 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 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 mo(;0tm7g3rjv mgy gs)yo0l0ooving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5. yrmgvgol) m0s7 y;o00t3oj(g0-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 origin, and a 1bu4pqs ,7zen90.0-kg mass sits at x = + 21.0 m. Where is the,p ebnu7z9qs4 center of mass on the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a two-particle system is at the origin. One p wl28sjj.m5us article is located at (3.0 m, 0) and has a mass of 2.0 kgj5 ss8j .umwl2. 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 7veiln k9a 9:hyd:2ekkg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates ofhl:7k9y adev 9i ke:2n 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 k0 xeqid7bx.0ut .f mnkce8hb3 :ue8b+ g, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What i8f ketubx0x eibm7+.8:nehd.30c u b qs 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 positiof(ax7 kml;g:c ned at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of f(;7c mal:xgk a 4.0-kg mass which will result 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 the posj-jeyn9 jkj1es- fp1v) bo h;-a3gmi/ition of the CM of a whole leg including the foot when the -kf-v1h 3aejbme1 j og-9;/isnj )pjy 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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