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

1#

What is the SI unit of momen(u bg4x - g2*0qozzhygtum?

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 backwaoe e e;cd04mo;zi* , 7jo2kejxrd 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 frictionlesw.wsbpa+s s/ 7s level railroad track at constant speed. The car is op+.w/ s saw7pbsen 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 frictionless ice. p t *wvbw2cn21 ,l ;mk6xg/779el hbmjhoa8 mx What happens thgb 8hj*2729mxept 6vmcbnlwmxk ol 17a/, ; wo 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. To7zzb7zg:p4 tz x8p9,)icyul hey are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change 7uzlt7)yz , zb9 :4gxiz8pocp?

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 reu/) yqw z2hcz-lzcu 58,sg/hr present its kinetic energy in terms of these twqh -/gh z/uu zwsr ,)zc52ylc8o 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 en3lulv 53-d) 1z kmpzxgergy you gave it in the previous pitch, the magnitude of its momentumxumz )p -lk5 z1vl3gd3 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 tf f3t8d.etyw zvi7r:2 erms 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 conservationp/4; tsg7c1psfj0; +lohqos w 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 Force versus time (F vs. t) graph represents o 0qcd;a4eu.da/ e.r gvol30m

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 statemenlfg,y4 ajq:n yw*yu(6)we t1ut?

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 fdzwe4 fa6w *)75yrl0gq m.a5 opxexk:ollowing statements concerning the magnit mw xo4l56g:r xawy5d*zq e.)efa7p0k ude 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 a2l*obulhut0rq u4s/4 nd the other 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 greater magnitude so24/l ruuq*tlu0 b4hof 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, collide j eorj:,z)mu:l k+2yjnl+j9 zs 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 2 lyn+j)elo, k+::9z jujmjrzthe 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 eajfy((s0 cg0k wch 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 at 4.0 m/s. It collides head-on w)h o v (rf.*/ppt,qurcith a 6.0-kg object moving to the left at c.*,u) ph(fr/portv q2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg halfback,xqy+omy r( e1h7;,:fopohrp running;:qf7x p+yooo 1rrm,(y h ,phe
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 cona8tu92)n ww/0fjcrh6xlo 7 (cir )vhs served, then which of the following statements is trrxj)h0 6/i97sc8laf2t) ucvnwr(wh oue 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 conserved?+0x5gj q)lrv6g+jr 5x3w ottz

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 buua4xe*g k59b.l pos;all moves away with the same velocity as the cue ball had originally. The type of co4su p ;o5e*gxuba9lk.llision 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 ba x/1i+90ulxrflfdj (tll rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach b t l(d0/j1fflx9iu rx+all'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 collhmhf/0 hlx+uzc9;u9rzs3 p vesx4 (8k ision with a stationary bowling ball in a friction-free environment. urms vzh l84up(hkx /s;9e0z cx39+fh If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on elastically h.*h m1,6 yho) -birgw,pa tv+d( abwdwith an identical ball at rest. What is the speed of the i,d h(wy *tg6ahab-rp, .+1h )ivmd obwnitially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a very ligiwyx68pgh 91q :v bv4 q)l7uqght object at rest. The collision is elastic, and q6uwxl:b i) vgpyqv 81g9q7h 4there 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 +hfb msci9-*+;imfyx object at rest, in a frictionless environment. The collision is almost perfectly elastich;9mbymfx+i- + fcsi* . The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball oatx+h z*l36x8ranxq8qq v 24 mu,pru2f equal mass moving with a velocity of -2.0 m/s. 2+u8n trmqlaa*4rh6qvuq8z p 23 ,xxx 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 collides head-on with a z(ve* c7v d auzsxq56mql9box v1*q;/very light object 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 afteq1qm7x dal5x **z s(ucovbzq /;96vver 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 coym eyhham2*m(qb j60/nserved, then which of the following stabhm0q6yeh2j* (m y/matements 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. Kineti- c/of /fyhu-4i;l )hu 6fiitxz55ah fd:n+ek c 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 the4omvky59vc61o f0 xjck::kxb right at 4.0 m/s. It collides in a perfectly inelastic collisio05: :kocy1m4fo 9v jxbxkvkc6n with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Whic8x ji6ekq o/bjbg/18sh object experiences the larger magnitude of momenxk jesbobj8/qg/ i1 86tum 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 whi78qu2u0dopm4 b t gl (s.aop-fte 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,:i+ jep6yxye t3 50fte M and m. Which of the following statements is falsee:+6jx iyt0 yte p53fe?

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a false statemefuxa6 :qai8ip 2)xx bms5zgngy hyj z249+:c*nt?

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 t9pe8ahz;jz05lq3gr 56eu hy

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, rb/3mur (a(8f 8agsnd leleases a bomb, which explodes before hitting the ground. Neglecti l(g / s8fan(mdub3ra8ng air resistance, the 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 . -e xvdm*pd9nlevel friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this syst9 - .nemx*pddvem'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 tm0hsh; *a 4q wepx 1v9/qzpl-i6fw4cvvs 1*ysystem 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/qd8.j ,9nxr kds?

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 sout 0.o0ztaygkr *h at 20 m/s. What is the magnitude of its momengo.arkytz 0 0*tum?

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 dropp1ls and+k.o 5t6ouho8 :o z(aeed from a height of 12 m. Its momentum when it strikes the ground zd5o+atosoe .l6aonuh(1k 8 :is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to each other. One moves w2; nc1) lrvlm/ka o+dsith a speed of 25 m/s due north and the other moves at 15 m/s due eastrknl+)v m ;d/scl12 oa. 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 atu; uycbqdw78 *9 9rvkm 30 m/s, strikes a wall and rebounds at 24 yb9v;9 7 *dumc wuk8rqm/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, in zm7mn*v7rz1ritially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the ozz7nvr 1 m*m7rpposite 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 (excludingmol/zl3k9j1* 28kth8xf tlmz 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 pitching machine? (Assume negligible friction*2jlo/hml 1kk88t fztz m9lx 3.)

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-walksnub o-f9 h4 3wyig*-k-g0qcting outside the space capsule and is stationary when the tether line breaks. As a means of retibug3y-n*g- ksc4o w9qh tf 0-urning 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 hea.lipl.agn o0 +d-on a large object at rest. The small object bounces straight bai0o..n pgal+ lck 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 ; /:a c.ojehg -yajio)ctq 3w/ice at 4.0 m/s to greet your friend (40-kg mass), who is standin ay//io. )3-; qjwhjao:gctce g still, with open arms. As you 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 k hi+,czc5g-1nejnj; pg moves to the right along a level, straight road at a speed of 6.0 m/s. It co j;cni+1ge 5 p,n-hzjcllides directly 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 25oqs dr 1( cl cw ,zjb,/i1zxcg+j,xt6t jv+(a6 m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of the cars after ,,6c(j+jzi1lrs v+tcd zb qc1x,(o6w gj xta/ 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 cm92 xa4t u) 8cg,s0*o gmqu hn*llh7mboast along a level track at a speed of 2.0 m/s. It collides an h* b8an4st*qm ,g2mouh 9ml0 x7glu)cd couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction on a hori)6n (pjnn ,jyuzontal tr6nujp,( jn)yn ack 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 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.- (kq- v9u cq dgcqmi6c.6j3xi80 m/s (with respect to the log). With what speed does the u6iq3m vdqcxj-g.q 6(ic9- cklog move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force sud*ykrdn gb96z : dbnk)7denly increases to 15 N and acts for one more second. What impulse wz: d6gk9byn k7)r *bdnas 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 xg h y6l:/mdwpbqu8960hx8er on a 6.0-kg object. What is the object's change ofp: w/ h6bqr8xgeml dy9x8 u0h6 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 bric,eg/ ) 5vvybbqi *2gqlk wall and comes to rest in 0.20 s. What is the average force the v)ie2lb5gqby vg/,* q 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. You hit the ball back along txw kgp/-9 lo(hlnzy:4 vri9q6he same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what/lr6p izhl:v(ny-9qo 9gx kw4 is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speeds3lcj2;zeqgt5ez6ez1 l,aev( of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what i2j5(v1 c,llgaqezz3 6ezee t;s 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 vn x9epvax.) 6aelocity of 750 m/s, at the rate of 300 rounds per minute. What is the average forp 6a )e.a9vxxnce exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning bu ez w+mgr9+zn6e;sb -y3/mm(r8icf xk/p- lyailding in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second8zr +em6s3e9gbk/w mianxy( -lfr-mc +z py/;, 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 drainpipem)cayzm; : -kaey9x2h at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, whaahm ;:x-2 myazyke)9ct 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, ac6 tql buo;.(rig9:jp,yd p*a7hw /tcjhieves a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force does the rocket engine exeuw6 cp/at,oq h7;idjgt9*b (l .:jyrprt?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initia kh;g11p+ph:8gzbjk3r 9wl;uttx; qjlly at rest in outer space. They push each other apart. What is the pgq8;;hup91l :zwhkjbkxjr tgt3+ ;1ir 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 a sp,i1ec s hzn4z lko doi0cb1+/3eed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What iskcic odes0/z1 4hzl13bi+no, 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 direction makesv5, :q1fnelyh a head-on elastic collision with a 0.15 kg object initially at rest. What is the,qyefln5h :1 v 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-k9v72p,u e nctowze8v :g block at rest. The bullet emerges (the bullet does not get embed8ecen tpu2vzo9 ,vw:7 ded 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 head0+m89ipki rjl -on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-parl 0pi9ji8 m+rkticle 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 head-on vf3r 0x4y hn8uwith a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after th0 3 yuhf8nvr4xe 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,sdgtm, h6o x z9n,ee: moving toward the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is p,t,e o9g6ex z ,hnd:mserfectly 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 coly/ +: pcn;itpc;jmc6u lides head-on with a 3.0 kg mass at rest. If the collispc+n:;j;u6 m c yc/ptiion is perfectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the eas jyw7 uwfo6m2+t at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stajwuy6f 27om+wtionary 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 station5 g.*tlb7l qi/w2zk8d fjj.zg wagon, who's mass8.i t5j* q/blwf g2.zj zdglk7 is 2m. The bumpers lock together in this head-on inelastic 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 direction buries vq(.9 6l mq i +icdx7m3hli6mgitself in a 2.4-kg block of wood a rest directly above it 6c7i giv.(d +i6ll3mmx9m qqh. 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?

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 eajaju v,1h4(k.e + kzzsa1qb 5kst collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the 1u+4k5aek zq ,v.(bjhaj 1 szkcollision. (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 collv fzg4zc6 7ikt iii p70re)p3.ides with a 3000-kg car traveling at 60.0 km/h south. The two cars s06zip )7czk rgt 7 3iifev4pi.tick together after the collision. (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 frictionless surface. Object A moves east with a(w 3rwkbft8-j momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the collisib(-rftw jw3 8kon?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a va,aa57,fv chtbw1q,+m3j;q ayf dx8ielocity 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 with a mass of 1.0 kg. What is the velocity of the tha a51jtyv; 7qmaf ,d+fq ,3,ihxawb 8cird 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,qn-)yt6cfy* v3n0kncky1 o 3j and a 10.0-kg mass sits at x = + 21.0 m. Where is the cey-v1kn y c tfjo*0 63nykc)qn3nter 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 tx+vmf-s6zj,p lrd1m qn6 :t)p he origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3.0 vsf, +jzm-1:x rlqptm)6 p6 dnkg?

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 fo f;q8x,hez dr0llows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determinehqxz08f de, r; 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/*eggcqp tf1cj x.r 61 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the cente jrcp.x*gc1f t1 egq6/r of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is positioned at qa12optx8i 2 yo6v(vc (12, 0). What are thpv6tyo 1 x2oqc82aiv(e coordinates 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 thebtzuo 74t;skuyb+ 6i4h x20x e position of the CM of a whole leg including the foot when the leg is stretched straight out. Assumey ;sh4k27tb u b +zxut60xi4oe 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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