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

1#

What is the SI unit q3/v g+ 16i yj.(bsbq mcjbxg;of 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 bac:vh;iyjo+v 5 1 ru/zpmkward 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 frictione. :f0p6fkoe vless level railroad track at constant speed. The car is open on top. A large loafe:vfk .eo 0p6d 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 fri,ah) q0vc2ip 2gbuk 7ta20wrsctionless ice. What happeub7av0rac0gqtsw2,)h22p i kns to the velocity of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equal mass. They are thrown wits4dweq60t- qyvjrp3k:u-gpfx j2; b :h equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Whic qxj-f 2b04vks g:tp;e-j :3qrpuw 6ydh 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. mq8 :pqcqx99*wm r/fd How would you represent its kin x wf/:q*mcd8 pmq99rqetic 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 tjomh+8kdw 0: (m.fhu-gw dn( the previous pitch, the magnitude o.-ho ((jg :dkw hmud0t+w8mf nf 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 te z n,3yzjj hf.gl;ji,rst0vo/*7ge n1rms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of m tycablo560+.jnbc i2mp0 xs3omentum.

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 (F bu33y+:od19 3 zqqd e x-fpcpuvs. 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 statementj ,c x-kgj g5*mz2,nyd?

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 8;wsqe*.c 6e4xmeqoush z,9 ek in a head-on collision. Which of the following statements concerning the magnitude of the9 oz8wesux*sh4ceqe ,.; qm6e 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 oth).i0xv np05 nypw adt+er blue) 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 grea0yi +txvadp5)np0nw. ter magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s,p xu- 9h8nv(za 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 objech8pax-9 v( nzut experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

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

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce off each other. Linear mome, 590+skf omw(+h f4wtmp usyyntum

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 7x qqn: xtlq3 ex54t- mco5dq(right at 4.0 m/s. It collides head-on with a 6.0-kg object movil qt -3qn5: 4ce7m5doxq q(txxng 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 atq-c,/r) ;qqtnsd/ gb f 2.0 m/s tackles head-on an 80-kg halfback rtq gq f;d/,s- /c)nqrbunning
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 dx- cv4,tzrwjs2-zj4momentum is conserved, then which of the following statements is z,d--rcsj4t4zwv j 2x true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conser 1 jvjycs3qzs6fo2;ywf f)ljsk,;9 0dved?

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 rl.pp9 6 :8bqw wxmr8a#5 ball and stops, while the #5 ball moves away with the same velocity a8xw lr9pbwp.a r8m 6q:s the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling ;ob8nwbws 2 ,cwith a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, appro2nc wb 8w,obs;ximately,

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 8qbav2l:f6mbcp la,6/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collisq2m6f b lpcv68,ba :laion 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 identk*iamj--a u;l 2ln.zvv 2t7f tical ball at rest. What is the speed of the initially stopi2jut am-azl.2-vtk v l; *7nfped 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 movingvlniv asl/lr 1+dfc 44hj87f- with speed v collides head-on with a very light object at rest. Thec/a1v lfjrl+ fd 4n-7i sv4hl8 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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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 3ulp k:y1jmp9cfuy203 8 x0r: imp ddcobject at rest, in a frictionless environment. The collision is almost perfect 3r2jppd0u :d9 ymfk0y1im:l8c u3 xcply 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 l1;v+gpfp5*jnwl .r : 1xecbja yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball aftercpbj15wg frln;+* j .vl1xpe : 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 co nx5t:o/, .d5r(rwu xjp or)i/elk kj0llides head-on with a very light object moving with velocity -v. The collision is elastic, a(w/50k rx ir,jnpodjl/to )5u.kr e:xnd 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 c sk3:duprq./a onserved, then which of the following statements is3us.q:rdkpa / 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 togethygwd* *+.*ej9 )kw2amy qgx+2qzc lrcer. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a ptm/pbmm,6 nvec -e) 1i(jla+lerfectly inelastic ccv-n ete(m/,i) 1almml6jp+ bollision 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 anir us9-b9 s:ymd sticks. Which object experiences the larger magnitudis:rusb-y9m 9e 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 w p.ys*+ )g :zsdd0qagchite cue ball hits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M andbvli5u6vx6 w wqa +,q: m. Which of the following statements is false?x6ivb: ,6 +5luqawqv w

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 tyog: 1z+8;tdbwe .iufalse 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 ovo)wkk1va2s).l(rr zrder 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 ex85lvsl :j )4t5be8t 5yvauz ydplodes before hitting the ground. Neglecting air resistance, th5y :5ll)ts bte84vz85avj uyd e center 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 cjab+ ,wg5+ mvkollision was completely inelastic and both cars quickly came to rest during the collision. What is true abm,5vagk ++jwbout 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 -s: s: 5fuehmcsystem 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 traveling at 35 m/wiedln86* mxpqf -9l 1s?

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. What is the magnitude of t+ yj4x*fl77 w dvxz7-3 sultiits momentumt dw +tvz7lxiyl7 fs-*734xj u?

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 height of 12 m. Its momentum whettv0q2t9g1: ui f7s fan it striket fi02gqs9 av :1tutf7s the ground is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to each other. One8uh9gp. c1jp 7vico 4k moves with a speed of 25 m/s due north and the other moves at 15jc .8o9i71pu khcv4gp m/s due east. What is the total momentum of the system?

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

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

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

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikt lq,g8m;5lwv p ,shb1fs)8 hjes a wall and rebounds at 24 m/s. What is the change in the momentum of the ball?ps,s5hbj8vq8l1tl hg,f ; mw)

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck ;9z +-ort xr*sk47gp uq,liopby a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the chang;g-79p 4rzs,*+k xtq ouir ople in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is plac r4c3 5bsfy lhq09:oqued on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in thec yo 3f04 uslq5:q9hrb 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 space-walking outside the spacekce( p/*5 :s7 xgdjkig capsule and is stationary when the tether line breaks. As a means of returniis /gxkd *egc: k75pj(ng to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches head-on a larg*wvafmq.:dfj, 8eq e:q; 5gsve object at rest. The small object bouncf q;v,dm5se:*w: 8.vjeaqgqf es straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg 5ptf+rf6idqm3( 9 god2 0y73 itzdinkmass), who is standing still, with open arms. As you collide, while holding each other, w(zi93or k 6n2 5f+p dg73ty0 ddmiqfitith 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, straig(: *tw(gv)ovppf1rzp,g)t, fwpv7o l ht road at a speed of 6.0 m/s. It collides directlyw(7 g opvpr,( plv)w,g1offt)pt* :zv 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 25aumg ;d;xp1 j6zep nmuw82)f * m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What 6;xu mu* fwem;pn j81adpg2z)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 allow x;/thryfg8/6p; zsncnfl8y 3ed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes rec6p/r8zy;yxln3 / 8 fgn;hf tsleased. 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 massuv, zqw9k. +, vv:md/osk*z rm 200 kg, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How r9z:vd/os z.qm ,kvmukv*+w,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 (with f s*bp-7xvn +e :1rzpcrespect to the log). With what speed does the log move, with respect to the shfz r -p*v+1:xsnepbc7ore?

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)i .t9eo ac;wwkc/lu64at m;y.0 s on an object. The force suddenly increases to 15 N and acts for one more second. What imp ;iwaw .) oeylctmk4ca/9t6 ;uulse 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 2.0 s on a 6.0-kg 73z+n1nk6d,u n gmwh uobject. What is the object's chadnguuw7 1nhn +,z3k m6nge of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30 m/s, collides with a brick/3tqmqr/xp7 u wall and comes to rest in 0.20 s. xr7 u3pq//m qtWhat 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 you at 20 m/s. r 5ssm4uhm)jon./s vt: (c5at You hit the ball back along the same path, and at t )s(mac 5o4su: nv .s/t5rmhjthe 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 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 droppq*bnv 8:ct4 kjid0 .:hpxex5med onto a table top. The speeds of the ball right before and right afterh45ti8eqkc:vxx.0b*: jn dpm 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 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 muzzle velocit u+2l-mxo i+cty of 750 m/s, at the rate of 300 rum tio-l2+x+counds 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 on the door of a burez nlywdvec4,z,7a zmg7;q-, c jo2s/ning building in 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 velocg/,e-mz;ql7cajz47z2 nsce ,o,dw vyity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per minute. It f z/em 9tw:rbg/ n(:bjyalls 3.20 m to the ground. Assuming the water doesn't splash up, what aveby:(jz rgb:met9 / /wnrage 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 velocity of 40 m/s a g oz)5rjin9blpz-j9,qgs/l+ fter 3.0 s, when fired straight up. What average thrust for lr/ i59j)j q-ps+zbgg,o9lznce 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 lmlx dtqd,3jo8ziom- s +*;t(60 kg and 80 kg, are initially at rest in outer space. They push each other apart. dilmlm;,o8x(oz j*- tq3 +dst What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with bsw;lg25c m7t a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the lelm;t57 gs 2cwbft 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 (dzgg, q63kh ra velocity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg objec3r( zg, kdgq6ht 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 fired into a 1.00-kg block at f5uap n qk,g6nf-( nf/rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the blockfn6f(nfngauqk ,p 5/- 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 alphto qjq,as5-bx,; tc h +x.+rmcrl9gk1a-particle (which consists of 2 protons and 2 neutrons) moving at speed v. j15gcrcbtk+a 9- rs+qloqh,mx;.x ,tIf the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides he g 9q/wwq:1hgrad-on with a stationary ball of mass 100 g. The collision is elastic. gq qw9r1hgw/ : 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 mo c.avdgl s4e 9i6n:,iiving toward the east with a speed of 3.70 m/s collides head-on with a 20d:4 iiv 6c.easi gn9l,0 g ball sitting 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 with a speed of 5.0 m/s. It collides he pv6mze99q/hwf k9m2o ad-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the c99hvo/mqk6 pme9zw2f ollision?

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 df*d-3zcuz-mqcb3 z 1speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a statiof -1zd b3*dz-q czmcu3nary 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 sp 8v o.(6xil1*mbe /m1w./y wkc1mpiaurr +ohtation wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What frimbp l *w6c1(.v+.uk1oohw er8my/a1r/im p xaction 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 direction buries itself in a 2vs.6rr,j2bxfpn 0yxi 0fh* 2a.4-kg block of wood a rest directly above it. As a result, the bullet/block combination s2 xf. h,00brxvjyniap fr *62moves 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 collide):x+b17xn q neu 3bnov7/wv zys 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 1o new)v7n7xyvxzb3:/ qnu+ bspeed 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 kmxu )v0vu),cilmnw:ms;3 a dc3/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. vdm c s0; u3lian)3,xmcv:u)w(See Fig. 7-1.) What is the direction of motion of the cars after 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 fricti1 0;;um5 ihq*m-6 0fso ccozgg-tot dconless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a pero; m6 ;1cmqt usi*-gcz-0dot5f ogh c0fectly 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 t ctf.c ch691ivsohe((l qyb( :8xn.iuoward the North with a velocity of 4.0 m/s. It explodes into three frsq6v.f (.(iilxnyht9 o( u c:c81h cebagments: 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 origin, and a 10.0-kg mass sits at x = + 21.0 .ck+n72 j 7utr zk5hr8)j -c m:kkkvsrm. Where i2 rkukh- rm) kt+k58 .z 7v:nr7ckjscjs the 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 originf1v4o 9b - gwed3t68 gdm:mfku. One particle is located at (3.0 m, 0) and has a massv6e-bgf t1fdkw g:93 8mod4mu of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0)u;:luj7 kcyve3) s) oos(; zqilk( hc,, and 4.0 kg at (2.0, 1.)i ;skl; :)esuy,7z ovl3cukchj o ((q0). Determine the coordinates of the center of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0, 0)btu 6:z 6*ml.zj( wbzbdj6u *c, (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of6bb6t.m*zuc : zj6dzw l*(bj u 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-k8en3uw 6gpyzc8:t. a04 v)v k mv(fliug mass is positioned at (12, 0). What are the coordinat4 nv pa0f6mklc)vyuv: 8z.8iuwg 3et( es of 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 position of to n9zcpdxnrh f(rey b1,q:)1*he CM of a whole leg including the foot when the leg is stretchferq )rph*n,nb: d191y xc zo(ed straight 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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