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

1#

What is the SI unit of momentumu (;6 zbag;kioq3:ws:t f7xx y?

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 ba)(9feyz wd pz7js fvun660 +e jau1uf0ckward 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 frictions; g;a 4cyhw)jf9n0wsless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to tnc w;hg;sjw y9)sf 04ahe 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 +pbld, jtkcu sda*87b2xrk +2while sledding on frictionless ice. What happens to the veloci2pdlks ut72kdr8b*b,xj ++ac ty 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 thrownkt;y;vlrc z,)5 cq ky1 with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. r,c z;clk ;qvyyk1 )t5The 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 mome2m;jm +t w2 ad n-w6v.kucukl*ntum p. How would you represent its kiwk ud+a-22*;6cjn.lmumt wkv netic 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 twicp ta y2ittg 35vtu:,nbgcu;:dsv2,h1e the kinetic energy you gave it in the previous pitch, the magnitude of i: ;gun5va,ttu:p t2dyt23bv c1i s,hgts 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 ofz ,ge9mn hh*19cw 8kg 5qnt2pd 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 mom5jky4 kmh) gk2entum.

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 ve/.sm69ex brv zrsus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate statement?8-nc /q66u9 wlf4 u dqtrk:swb

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 t.d ioy4apz+se ,1v3 mcollision. Which of the followi4zp1,ismy ve.3t oa+dng statements concerning the 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 (onev -4ol+ yf)/bmbkey :a red and the other blue) are dropped from the same height, and rebound off the flookvbey)/b -lo f+my4a:r. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at 46;f4uwhga kdi((dnm0 5k dmh3;u zl8ykf+km a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces k+4(;m 3hdud d fu4h0(g;mify5lmk an6 kkz8wback to the west, and the bowling ball moves very slowly to the east. Which object 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 -mu bw0 :jxw-6qf apgid*5uj/bounce off each 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-oneamv+fau002i with a 6.0-kgmaa002u+vef i object moving to the left at 2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linqic+( rwgsf6:+8pyxb7 vck4i ebacker moving at 2.0 m/s tackles head-on an 80-kg halfback runnipc8w+vi7g4 bk(: qxi6 f+r sycng
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 moment:zkqd8pa gf,bjo 37k7um is conserved, then which of the following stagf:ab7p7zkd, q3ojk8 tements 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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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conse ,e*ji3g +niprrved?

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 u425il1x x/jiuwtw 02frxl8 othe #5 ball and stops, while the #5 bll ww5x82ioxj r24x0/uif u 1tall moves away with the same velocity as the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a s57 -ihaq ,x6rip+ai z4mii/ifdexq +0 peed of 6.0 m/s collides with a heavy exercise ball ati ,fiqd4i a-x+ +7mr6/qzx0 iie aihp5 rest, the beach ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in a v7izas g4; qkouty//7fdevt6,5u - vhhead-on collision with a stationaryo7 , dvhuvatztfe/7g y s564;-kvu/iq bowling ball in a friction-free environment. 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 co(kj:x0ah2*h: jiro8m d-jb9w)kki ult w x :2fllides head-on elastically with an identical ball at rest. What is the speed of )jl:rjk9w dm0 -xfbhwao i:(2uk*kih 8tx:j 2the initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v colk.qgpmv-kv s(l5: vrl r8hz31lides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heav: .8s(-pmkrv3zl vv qlh1rkg5y 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 w. ws7(q mdhp5aith speed v collides head-on with a very heavy object .pwsh7q (m da5at rest, in a frictionless environment. 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 velocity of +3.0 m/s collides head-on with a yellow ball o f 5mhnsk05kq:n;ywp /f equal mass moving with a velocity of -2.0 m/s. What is the velocity of the5skk qyn;p h5 nfw:m/0 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 hep + u/69ce;cgipd 9k k-/mjmxtad-on with a 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 lighkg9i/c- d /p j;t+umc9p6e xmkt 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 qu b3kcq59)bp is conserved, then which of the following statements i3bpqkb) u5q 9cs 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. Kinetiy4 9e w4dfv 1rh3sotd(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 the right at:e hlgjx h;5i: 4.0 m/s. It collides in a perfectly inelastic coll h i:;5ex:hgjlision 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. Which object experiencewa,df62yiwz 3 s the larger magnitude 6y3aiz,w fd2wof momentum change?

A. the large object

B. the small object

C. Both objects experience the same magnitude of momentum change.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and is deflected at a 1 nad,h,ed5tn$35^{\circ}$ 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 massea0pxvnvb 38wf-c26y6n yd w1 ss, M and m. Which of the following statements is false1avw-0 8p 2n cv6ysy6dwbxf3n?

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 sta0i mbu;y ek;-rtement?

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 aq 50axnjm)08 dw+lfgsjofv g9e )*ev 1 long flexible rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horip:6 zq1a* fwfjzontally, releases a bomb, which explodes before hitting the groujzapq f6w1: *fnd. Neglecting 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 o)q tk nun *c,lq+jk,m3n a level friction-free road. The collision was completely inelastic and both cars quickly cameq nkm n+,*kl,t)j quc3 to rest 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 a system of parti00oumygd-y; 82m3u l h-qcd qucles.

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 2000qc wo665jwuu1 *rk32 2gpkx kn-kg truck traveling at 35 m/s?

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

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

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

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

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. What is the magnitude or mi0* h1rol/dhuca:i4z/bm/f its momentumm// alh0 4*/idmbz1 riur h:co?

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 kl+5rbxo;pts9m 8)jf 12 m. Its momentum when it strikes tpmj; t5rbl 8fxs 9+ok)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 are moving per ,3jf(lolybmya4m mtm;4 o 7t5pendicular to each other. One moves with a speed of 25 m/s due ym(tb3,lyoj5; mlm7mo44atf north and the other moves at 15 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, tr5 uz+j svxgiby )9(lp5aveling horizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. What is th+x y)5s v (lpijub95zge 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 at a speed of w vz *jmb9 9s-qowm ebg*(usy.7:uq q/12 m/s, is struck by a racket causing it to rebound in the opposite direction amsuye g9 qb *qj-9:zvqs/b(.* wuwmo7t 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 baseball) is placed on au g7ps-.6dgnln0 .x8:zq jfdb frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is thexnus7z-n:bdfj 0l 8d 6gqp.g. 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 space capsule and is s/ h 3ch0.)tofhzrnj,p tationary when the tether r3 )hh/ohc .nz ftp,0jline breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move 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 ntglm b zk7:j4yk /(l+qew( 3wlarge object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of thebyt74gen:kwzq (j/ +l3kw l(m 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 mawh d 4c.-exktg3be s+:ss), who is standing still, with open arms. As you collide, while holding each other, with what speed do yoc bts+dexg3w-. 4k h:eu both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the right along a level, straight ro yktioe9 pv1fm8k*w;3 ad at a speed of 6.0 m/s. It com3i k *;k9epo 1twfy8vllides 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 25 m/s runs into the rear of a mu5//86h ruspn m:hbkstopped car that has a mass of 1500 kg and they stick together. What is the speed o b/6s rhku: 58mhm/pnuf 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 coas9emgfi29h7prjq +/8t.rgwmw t along a level track at a speed of 2.0 m/s. It collides and crm78 wqjggh9r+2wtfem .p/i9ouples 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 ne9fs* yf)bem8 ltln*-;+fff.5k b /mfvuh *f dngligible friction on a horizontal track with a speed of 10 m/evf/ n*hbffd**ffmb tmn. k9)l-syf+l; 85fus. 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 6+ .tmgypoh,r41e8+s efil )j wefqh-100-kg log at the rate of 0.80 m/s (with respect to the log). With what speed d1r yweelis .+jh, + t8h)pgof-6 4fqemoes the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The f n3d :kzfw.)/-(cgz;eeau ik q2a 8(urds6iig orce suddenly increases to 15 N and acts for one more second. What impul.qdaksu zae ;d3 ei)ik-unw8r/i2 cg( g :zf(6se 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 object. Whao v2g(1mvb f my(t k)ek+94xwct is the object's chang+wy)koe x(cfkm4bmt9v 1(g v2e 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 wy2ado 4sv x),rith a brick wall and comes to red ,avy24o)xrs st 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 pitchpzb i c cm.)x 8tu0pqwt:8-r3zed to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was ic.bzwr:uti0p)8 3zqct-x8 mpn 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 dropped onto a table top. The speuj,txz x; y3sg0m3 er-eds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respu30,y -te x; rgzjsxm3ectively. 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.cr ipq (:77l -rfxrhn:0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the aver-h:crl fn7(r7q:ixp rage 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;m80dt zuf q(kg+ buy. burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per se;q8gb d0mfy( zu .tu+kcond, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per mk xeqc)7s )/83zbslh,1 +(f nduhcibjinute. It falls 3.20 dbz k)e1uflhis7 j ,8bc) (h n3/x+csqm to the ground. Assuming 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 velocity of 40 m/s after 3.0 s, tda-vuz (cz. 1yrh84wsf5h.ks+j5v u when fired straight up. What average thrust force does the rocket twzr f (ch.v5szh45 uku v.a+yd j-1s8engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at rest in outer space.5vy x(foc:; xbg-l h6s They push gh xcs;b5o(6y:-fxvleach other apart. 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 a speed of 2.0 m/s. It collides in6u2he mnbd;ve 3)je5 e a perfectly elastic collision with a 6.0-kg object moving to the left aj26); 3bhe n5uvdeeem t 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.i:99zb7 ra;ifof, w ij20 m/s in the +x direction makes a head-on elastic collisiojzfwo,ifii 9b r:97 ;an with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest.1n8lo;b hk*k j The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right after the co;*bh 1k j8knlollision?

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 alpha-particle (wo4 xjll8o,emn 0o3h /pbzkg8 /hich consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely o0ln48 o/bhm x, pzo3k/gej8l 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 head-on with a :cwhlin37;p6kfh y-di j, ay+stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after the n ;fk-ywd, y+hlc ah:73ipj6 icollision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.70 m/s collighl)x8 ga4m.56mcp rsxvbm/a k: yj 06des head-on with a 200 g ball sitting at rest. The collision is p 0c6bxv. p6mrm: a ag 5gjmk/x4yh)ls8erfectly 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 head 6rfts;m)nql x.6jl(g-on with a 3.0 kg mass at rest. If the collision is perfectly innrm6j6 s.gxf(lt q); lelastic, 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 eastgjmwp3z s h)q -3 kfz6e z(16;xsf*usy at a speed of 4.0 m/s collides head-on in a perfezsfm3jx s*ze-s u)1f6 ;3(pq zkhywg6ctly inelastic 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, travelingx vi-g -.m3tq1+y zkmo with a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on ineli3q ytog .z+xk v-m-m1astic 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 buri8p cju*hhchd y(z)/ owh/7a6y es itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves ohwcyau*7/yp /c dh z8j()6hhvertically 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 h0+l u9:t l ow8t/jzaz90.0 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the speed of tt+:tj/8uo0wlz zha9 lhe cars after collision?

本题所包含的其它图片:

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 collides with a 3000-kg mwsu:p-g wi3 q7j52 xroljif 08)y -gycar traveling at 60.0 km/h south:gipw ryy)f30 wm7jl-g-x is2ouj 85q. 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 s (h* ;fedxlir4urface. Object A moves east with a 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 tdfi*r hle4x (;he collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward:moue81agq m ld v*(qj;er(9 c-zz:ns the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a maq9g ;dr-(1j zq:o ec (smuv*nlmeaz8 :ss 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, andjyg h45.lbf(l a 10.0-kg mass sits at x = + 21.0 m. Where is the cente54( l .jflyhgbr 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 orij(jbklgox1)ah ,; ro6tu 5,ozgin. 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.o)l6z(t1oaojhx,brk u, 5j ; g0 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, aj9pj5seg1b as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of tg95jba e1jps,he 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, a 3h it zayrsg5nh,;+1ere located at (0, 0), (1.0 m, 1.0 m),+ya 3z n5ih, ;sght1re and (2.0 m, -2.0 m), respectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.sxx*u*2vb4 hlf i p;k)0), and a 1.0-kg mass is positioned at (12, 0). ipx lukv;4 *hsx b)f2*What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses being located at 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 the CM of a whole leg including the f gn3c8otvc81koot when the leg is stretched s3ontgv1 8cc8k traight 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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