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

1#

What is the SI unit of momlm r2-xti n,m4entum?

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 backward becao*sjj;(p: ux3cp fixajbu h;9mr 5b,/use 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 /z47 2g lfzkm 9b 5kewuunjz/8frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped 58 4un7z/mukbjwle9z g2 k z/finto 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. What zf h0m1 )4nbh):afnqd happens to 0madbf hz) hq)41nn: fthe 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 puttd90 s-xrndp b;y have equal mass. They 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 momentnd09s b-dr px;um change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. How would you represent its i2s yu5e/u.rd)8u5j r2ju ofw r gmb.1kinetic energy in terms of these two qua2uifrj 1ugrj .25uoyserw /m.5) db8untities?

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 i.pw s 8k 8iybhw3fa+7kmmo*4ut in the previous pitch, the magnitude ofa. 8mw7 *iukm s 8hb4woky3+pf 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 tera+fq mt.pb0o:y.en tv:. :zca ms 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 conser 9l,dc hnz5w 6mt2jjk08hj)dhvation 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 curvhoy lhwv26, 7xf. )hhlfw+yx9 e on a Force versus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate statemx.av-anw9w s;;/o hyo ent?

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. o)0mvv* (n tqjWhich of the follownv0*ojq()t vming 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 (one red and the other blue) are dropped fuvfdkc 76 0r7srom the same height, and rebound off uf7 cs67v0rkdthe floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a b8dr d,g*:amn *tf(uu speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the cd f:an*dg *ru,b8(mutollision?

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 opz/at 0b0djp1w7)fz: n burks6t+3f 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 auv9gl g)pr:2et 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is co:v gl )gr2uep9rrect?

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 hv338n2kghe;xvhzg ;a9htk pd-42i q zalfback runnid3 4g h2khn9-3 e 2gzv8;tv k;xizaqhpng
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 momeij:*2rwqp.je3 x sw f(ntum is conserved, then which of the following statemen swp3:j . jx(wfreqi*2ts 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 conser z1;ai(fp(mfwu(. d u gvjd:70,x hkvmved?

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 whegwl /(97 1 zfl0.kabk1uvlnz ite cue ball hits the #5 ball and stops, while the #5 ball moves away with the9b1gl7vn10 e wf lal(zu kz/k. 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 speed of 6.0 m/s collides with h;jv:vh- wwvmc8q s *z8oqnaujp*004 a heavy exercise ball at reshq*v p omjvwwczsua4 0n j0;*h8-q:8vt, 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 collim b, 4:j8l3oaglkr/h gdes in a head-on collision with a stationary bowjll 3rmho,g:gb /4k8aling 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 collides head-on elastically wit9nktzlyzz./+wb 0b : xh an identical ball at rest. What is the speed of the initially stopped balll+:0zzytwb./9nkxz b 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 b//, akdsfac:hq qepg* wu1b a/o(,q: with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. dkq::/qae/hsb ug( pc, owa1b, /a *qf 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 36f+8wzc:af1rwil hv3z* jtz very heavy object v+tw fia3 r:c6zzz 318lhj*fwat 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 ydk6nw1pr4m.x p++*qox5.t d7lz;sfjo(q o hbellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow bos (qo6jb .47 o r+pfpzd;mx*q.wlktd xn5+1hall 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 movw u a72,(hv k6w2v8 cyyv6kkeming with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and tw, 2yak(v6v wm286u7e kckyh vhere is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, then whijoflp k8kz 63)ch of the following statements is true about kinetic energ k)3l8p fzj6oky?

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 tny.9t42p tqfr ogether. 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 3o4erh sy7i8pright at 4.0 m/s. It collides in a perfectly inelastic collisi ye s738ipo4rhon 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 stp8+zm 3w5 cmc7,dwtaqw;ant +q ro k;4icks. Which object experiences the law43+qa 7cd5m+o ta;m ,zrw8knwpc ;qtrger magnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and ihlu:2 vdg6*8 y/pnos)n.by w ns 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 and m. Which of the following statements isp viy, e;-abf -;f+jrq falsbe ;i+v,a pj--qryff; e?

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 w4)(h1eun f iskzwaer 7ao-k()k(6tris a false statement?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers wal -(dpj77.r,rtcdjk d ik with a 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 horizontally, releases a bomb, whicg 3zj,x l7l6pch explodes before hitting the ground. Neglecting air resistance, the center of mass of the lj3zc7,pg6 lx 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 levelgvh /l14qmoz6c ).onccq4w q+kp)h k2 friction-free road. The collision was completely inelastic and both cars quickly /6cc)4o)pcqq 1kh+mzw kg q.n 4lv2hocame 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 parjsdtuikf w* sr+/ioqd-p(r*6 tgy66s ; (csi:ticles.

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 ofhljt /h; 1wu*, 3/dl cuxoc v.c-ggfw6 a 2000-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 eycyb* 9+jnd 8of its momentjncy*+e8d b9y um?

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 whel0a.z yef g3+x7hh8,;9 afg8misklk k n it s0kf88xhg glzlfh7m s e 3iya,k+;ka9.trikes 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. One moves wit smo dk-;vflkr:1 o1k;h a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momendvf1lo mk;1k;ok-s r:tum 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, str)k 1 sp 2pe.cfm*atlclm;0l f;ikes a wall and rebounds at 24 m/s. What*el2m0clt;.p mk)f fs ;c lpa1 is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12tdeac ;x *.jg li6,9vc m/s, is struck by a racket ci xal,vgjte .*9d;c6causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding 8q/nayvtx;.u8)(i. (cxoxii xir6v xthe baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the ax6.x( 8;vcx8ur) / i y(vqixoitnx.ihorizontal 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 space capsule and is stationary wc r-yyyl3c4ae 7vct r)qw+,i9 hen the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move93) +qr e4yccrv yt-wl7,yia c 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 momentyj+bjl;.*gro n-i)hlum 5.0 kgm/s approaches head-on a large object at rest. The small object bounces straight back with a momi-ng+l*)h o;byj .rljentum 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 gre,hn* 0 f)zn nba w*mk jcf9y.,ny+kg1iet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding enfka* .k,1)zyc ,jmby nfn9n0i+*hwgach other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg movea 3.90 b1rkijex, uouls to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum . ae9 bl u3ux1r0kjio,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 s xsd.dyg kk.6ktd /;025 m/s runs into the rear of a stopped car that has a mass of 1 d6.g.tskysd0 xkk d/;500 kg and they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coastl04eyeb7g9 cg-y1 dqu along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially a 0udeylqe-19 ycb74ggt 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 kt c7 dov iknr2pg2rp65lf 8f/9g, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straightk22p n/rtdfo7v 68c5igrp9f l 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 0.80 m/s (with r72c7njt nb*r xm0q/ vtespect to the log). With what speed does the log move, with respect tnt*nq 0r7bxtc72m/jvo 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 su- m)9rhv yy+yeddenly increases to 15 N and acts for one more second. What impure)m+hv- y y9ylse 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.e)bv ymrq3h1/9i 0jsb-v vnum97jn9 q0 s on a 6.0-kg object. What is the object's 9 1-v07hbqenbmi ur99j/)3v nqysjm vchange 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 righ(v5v;d c 7)v mk pqjkqyu(5)trt at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What 7 tdvvyp5umkk()v);5j( rqqcis 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. cb )-qap8tn2ub5/s lo You hit the ball back along the same path, and at the same speed. If the bat was tq s8puab 5l/cbon) 2-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 dropped onto a table to1df.5qgdlf7yhtg k 13 +za*q ep. The speeds 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 is the magni1d+a .qlf3khzyd gg qf75t1e *tude 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 x)u27yec5 6qgy 6a nixa muzzle velocity of 750 m/s, at the rate of xi2y6y)n7q c5 xa6eug 300 rounds 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 burning -npnqhoya5g7 l j(l-, building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 4 pah-(l- lqnjg y5on7,0 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per mho( tr)+ar) l ;4kdpj)sfy*y dinute. It falls4fr*lstkdpo;y) )a y dhj)+(r 3.20 m 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 k*t;a lnlno;.m /pnd8yg, achieves a velocity of 40 m/s after 3.0 s, when fired8 l nnl.;amdtp*o; /ny straight up. What average thrust force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at rest in outer smna (pa: 2hyfs2g/8bw pace. They push each other apart. What is their separation after the lighter astronaut has mw/s gyh(b 2mn:a 2a8pfoved 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;e w58h :yrzgg to the right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to tg w8h yzg;:5rehe left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x direction makes a head-on;xu0/hlv / qlsibnd8, elastic collision wit8x/vi, /bd ;ll q0hnush 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. The bulsljd,70m.1yu df9gc glet emerges (the bullet does not get s 1yfju.g97ddc,lmg0 embedded in the block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an alpha-particle (whichvgzsgoh9 -c +5 consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will 9ggzoh+ 5s-cv 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 +1tw6pkje tu 33o+24w2do bccv 40 m/s collides head-on with a stationary ball of mass 100 g. The collision is w4cootbup24vj+ 3wc edt 36k2elastic. 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 moving toward the east with w xj p x1/sp,ehnd(o,h,tmv(+a speed of 3.70 m/s collides head-on wi,1ex, dmpn(tx / (o h+jshp,vwth a 200 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 heait4fyub;yv 6fn* h-qap39n)vn-9va ad-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the puy v9; ta6abav 4 -n3nf*h -9qfyni)vmasses 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 movinggo .jwx4v5nxji 51)oq to the east at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a statiqjvj1 xn.wx5)5gi o4oonary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station wagong3e70.ou i1jq6ne+t zus 8fix , who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What e j6ii.e n71q3fzuu8ox+ ts0gfraction 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 dire+ zjgqkv. -jd2ction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves q+v j.dzkj-g2 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*e(co 1 zp8 4nfw6c;xkagp qo+vkh8 q6 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 the carsk4 ;qp8h6w +x(zoceco1*6kfap8 gnqv 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 collides with a 3000vi70wh0f68id hwt h e3-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars aftevi60ftw8 7eidwhh 0 h3r 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 lever54qi,: qnazi-isv m u5;e.dil frictionless surface. 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 the czi mi.iru 5eqs,;q d:a5-4invollision?

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 wi bh(rcq +4ceyoifvf-y /l.o:9th a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of l o:vc-fbcy 4.o/ri9 e(fhqy+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 a3qbu;1 gjp 9f9bx :pdomow 86rt the origin, and a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass onrqgdbwx1b:f9u 3 p8 mopj9o;6 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-p3cfu2w2t d7 tc*mg;s particle system is at the origin. One particle is located at (3.0 m, 0) and cg2df s3;2mpct twu7*has a mass 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 vs +qkq6ywz 3g(tdo 91as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), anqk 9(3yzdv+o16qwts gd 4.0 kg at (2.0, 1.0). 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 7 rdq5l 7bdxit2* yly7kpuq6qh2hc17(0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. 7qcqi717*x2d y6ku l5r 7h2yqplthbd 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, 8.0), and a 1.0bw tsi8pt 0rl2/mw:ubd2z2g+.h k;mh-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass oh+bw rwk;tzh8p2/u2dl: mgbt.0is2 mf 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 thh8u))iro ,fv w; vls8hy;)mohx:pz8be position of the CM of a whole leg including the foot when the leg is stretched straight owx v;y v)u ;8s)bmfih: hhro,88lzo)p ut. Assume the person is 1.60 m tall.

本题所包含的其它图片:

A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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