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

1#

What is the SI unit of mh1;rnq jip:6 momentum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a canno2k lho7mc we*5nball, the cannon will recoil backward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves along a frictionless level railroad tra( op9jx . po(u4,a.ftn-u)ue lc*wvvd ck at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the cawp fj(u.vo(*udnuvtp.)-ce a4l x9 ,or?

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 frictiknlsn:s6*+u f(/ bfxy1n x0kvonless ice. What happens to the velocity o unfyf n1xvl(xk /b0s6 k:s*+nf 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 masso,;+ca7 mnw q,hyd4.z.rda bx. They are thrown with equal speed agains., c+hay w4 ;7xd,qzro.mad nbt 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?

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 represdflewh76r0tp5xbv8 m 6zxy02ent its kinetic energy in terms ob p62tmf w7vz 5yxr8 l6dx00ehf these two quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic energy you gave it in tx.a ks,16dmp7a/ivyxfk 4s)vhe previous pitch, the magnitude aya),v. m1k s6 x7pd/vfxsk4iof its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of momentumq/xsmwc-mx2 *swc ; 7n51f fap.

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 conserra pr9x+0 jq1gvation 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 ( lusvlpz )c hm 9a(87ch8a5hk(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 followinq p*chnhgge;s:9o6ma4+v6mp g is an accurate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on cor,1alwe:)s h+a7ee kkllision. Which of the following stat ) aearw,ksl:+ke1 7heements 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 from th)a-fm 0 .yzvtge same height, and rebound off the flo)fa-.zgt y0mv or. 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 og8n.p)jbnc *0 qwg1u speed of 4 m/s, collides with a stationary bowlin gcb0uw gj8 po)qn.n*1g 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 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 bouncecd ;hhd/p8b qco2z lfbl*47*r 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 u-hig) *i kk87imaw7a.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 k wahmi*k8iaui )7g-7correct?

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 movik+6-9gr f1n,7bijt z5fqe di. e8fkdh ng at 2.0 m/s tackles head-on an 80-kg halfback runningfnhf.i86k , z-9gf+i7drk51 djtee b q
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;cokiiupow /q,jsuc8+y/, , :q3fd ud, if the momentum is conserved, then which of the following statements is true about d+iq fquwyp: ;3 cd,socuu/k/ ,ji o,8kinetic 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 *zp w7q8z6tzn s2h lsic+s9*uconserved?

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 ba8stdx qhdon;m 0a9 ,7cll and stops, while the #5 ball moves away with the same velocity as the cue ball had originallyd8a ods;9t7, cn 0xhmq. 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)7dze 3fe4c es with a heavy exercise ball at rest, 74zd) fece3s ethe 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 mafk mf*0+d 8 (zh1f*gcdpco1 right collides in a head-on collision with a stati+1 1cadzg fok fc(m8hpdmf*0*onary 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 collides head-on elastic4hje +ifg su2m9-uf( qa r4nd*ally with an identical ballhfqun( 2 de m *fr4gujs+i-49a at rest. What is the speed of the 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 speedx ad6:mdex*0t0jtw v 6 v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows dxx6am0:0t e *vjdw6t 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 )pr w bxcwamkc +/ +m yml7*r.2syhz3,speed v collides head-on with a very heavy object at rest, in a frictionless environmemmax r*/w7 zbh ) y+cm +p3ky.w,lc2srnt. 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 velocityin 26,)yo; y x+xw:opxozt ae/ of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow bxyo6t:n +xyzo 2e p/w;oia x,)all 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 ;a g8j:k9jqu fv collides head-on with a very light object moving with velocity -v. The collision is elastic, and therjgqfja9: ;ku8 e 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, ts /src5kae -o9hen which of the following statemenoar 5/s- ke9scts 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. Kinetic energ8c+z thxr7fbp nvhw)a0 )pef4 ,j.i. dy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in aag+pwlv;fm3 ea: 9we3s435hzq (rhkk perfectly inelasram 5:+eqh34hwvkkl;wg3f pe a9z(3stic collision 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 experienc -pat3/hf1; rvyo dzq*es the large;yap o t d1*f-q/3zrvhr 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 ho2b e*c vb3it;vb.vjq cm5jqc: :rz 35its the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of k541 xr; k .l tg7itv rfnrd5x0ik1-jjthe following statements is false?irjvgr1lk0kd7.x ;in t1t x5jfk5r- 4

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 qm w aprv1.i)1-lh1ggfalse 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 wam/irepyj +;: ilk 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, which exdy 9.x8zhwqq)a)- pp kplodes before hitting the ground. Neglect. k8zhwaqydp xpq)9-) ing 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 onr7 r;ef3gojfpr 9yb, :h./tn2 q2ald4mrle6a a level 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 system's center of93 h2rf; f4ymnre/r abrqa2 e7gld,p6tl .j:o 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 st94 k gqpv6/:pd gk3agystem 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 trzveyks:a ,e /2 lhvzz 2/a67-tqo/v kcaveling 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 is0bwj;j0 s r* jc5:ctjsz(l-yd moving south at 20 m/s. What is the magnitude of its momentum? (yzrjt s:jc-;w0l0dj js*5bc

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 ) iw-qe r.8ocf6u s:gsa height of 12 m. Its momentum when it st8 s:gcuq iwo.6es )r-frikes 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 perpendicularh3c 3 gbo3e qgqx76 pndjp0(p* to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is ( pdc* n6o0xbhg7pq 3j3eqgp3 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 hyn 9p ojh4dy01fpy012c lk1 okorizontally at 30 m/s, strikes a wall and rebounds at 24 m/s. 1h0y0okn2 1jp9kpf cyyl4o1 dWhat 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 12 m/s, ishrvk3jwy74vw9q0 :q qhu9 zjha0s9 + r:h6ksf struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the bqrz vaks 9:f96 j7s+uwvyh09 jwr3 kq0hh4:h qall?

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 (excludikaasw ig*4:ng mgnoh,dyv3x t(:8. -lng the baseball) is placed on a frozen pond. The mac(vans,lmgt na:*hwdgi8 :4 k3.y-xo ghine 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.)

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 stky49a(kte xfzya1pr (.-u w8dpyrf9-ationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the ca9ua1p4ptxky rfw efa(d k -8y.(zyr9-psule?

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-onko ez( tsr33xrp1 2q3w a large object at rest. The small object bounces straight back with q3k3esw r pz(21o3xtr a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.g0g njl9qg3y/g h;.ot0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both move off togg; gojg.l yn9 q0/3tghether?

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, str70 g jevtef9p6aight road at a speed of 6.0 m/s. It collides dire t7 evej60p9gfctly 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 travelin;+cb1.1 eac34fyv blf qr;glqg at 25 m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the ;a4 rfyf;c1ev+1q3blqlbg.cspeed 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 allowebo)dd(snmi8ct yd.0 9 d to coast along a level track at a speed of 2.0 m/s. It collides and couples wm0dbdst. i oc8ydn 9()ith 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 witon x3i 6d oqqco -4hq)7tv3n(mh negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happenso3 tq-q) o4vx7ioqh36 ( cdnnm?

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 respec:gqj/ r-z56nnfinc4 ne ;k*wet to the log). With what speed does the log move, with respect to the s*4jiqr gke /:e z6cf;n5nnw-nhore?

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 hp*vn: v-2rsgforce suddenly increases to 15 N and acts for one more second. What impulse was imparted bygr*v2vp :s -nh 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 ob 99ns 7igmrh3on d 7r:ejcqp1upr+k6:ject. What is the object's change of veloc cipjrr7h6g:ue nmo1dq s:3k+9n9r 7 pity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, travelin;0ukevz; m n.ng to the right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on the nn kmz;0;.evu 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 bal0a)h)vwcaoml 9 d( jh+l back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnild a0() jhwh +mvoca)9tude 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. za -jkpqj2pb ;*j*c3rThe speeds of the ball right before and right after hitting the table top are 5.0 m/s an 3-;j p2** zpjrcajbkqd 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, o 4 jbr1ex*n1j2.gnabwith a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the avera ojb*2rean n1jx.1b g4ge 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 buildin,nna)t9eoo*li/ g o n9g in order to knock the door down. This requires a force of 1000 N. If the hose delit*o)n,o nnag 99eo/ livers 40 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 horizontrhzp :q/aq.dkze.e65 x)u 3gdal drainpipe at the rate of 120 kg per minute. It falls 3.20 m tqdrh/xp . :5.) qz36uzadege ko 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, achieys r)nayar ( 8ad2gkw.ka2y: (ves a velocity of 40 m/s after 3.0 s, when fired straight up. What averagk w)8s.ygyrr:ay n(aak(2da 2e 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 f7cp, ye 1:apvouter space. They push each other apart. What is their y7c 1 a:ppfe,vseparation 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.5 py.m boz-t;6wc*rr q,;v: avgv*hux It collides in a perfectly elastiu5r mv op;v qgzc,w6r-*b*tyv.; x: hac collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object wit/hl51 hrcifrf*c20 pa h a velocity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. fa1*cf h2l0cp5h r/r i 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 rrkr /mf o)b/reqn. exv (m)i;(est. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity ofexor/fv)r.)(bki nm qr/e(m ; 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 alph2moa,ljy d cn7ed7m a2/;zt fiuj;j,/ a-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collisjmlc fz /2ni;7oj7y /jdedtu;m,, aa2 ion is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides 8fze5nzrgk /36hye 8ihead-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed 6 5f8yzne8krih/ zge 3of 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 a speed of 3.70 m/s collidesk9x 3uszc;6zw.yq x-d head-on with a 200 g ball sitting at rest. dwcx u- kszq.3 zx;69y 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 oqw p )/wgzlk15f 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses1gl5w/ wk zp)q after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s colly:tn*oa1 xjvs,*evf, :6hxb kides head-on in a perfectly infyvo1 x:xvetka*:n 6s, bh j*,elastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked stationuh /)2+g kcsin wagon, who's mass is 2m. The bumpers lock together in this head-on inelaushi /+nckg)2stic 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 verticp +wzx.fs+wj3,n;mjcibsj 1zmk d.:8al direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combinatif8c+m bsz z,3j nw.1jsxj+d:;pmwi k. on 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 east collxl5(.a27: yw 0xvocc, ge itzzides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick toc5i e:x zwtz7.l(va gycox02,gether after the collision. (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 travelipdnl /3np m8ko(s1mh5 ng at 90.0 km/h east collides with a 3000-kg car traveling at 60.0 km/h sout1opml /83 m 5(hkndnsph. 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 surface. Object A moves east with 9dsalnr l+k4((dlln )l ( bl(za 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 co9+(l()nlls b z(dn all4 kdlr(mbined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with a velocity of4m q;j.v.g. ke+hpot1gq3hq o 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/sm oeqt4k;vh+g.j.3qhq1 .gop; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sits at x = + 2 oput.q 2h/ fza.-/ego1.0 m. Where is the center of mass on the x-ax- 2z .qapeo //ufohtg.is?

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 origo,x,q e uh2xu/xs27-1 g)saqwt7o j yiin. 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 ofwy)uq17 /xo 7ju,xa2xts,h s2oe-qig 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg 1zxo 5,ogmk+ oat (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg+5 okm1o,goxz 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 (0, 0), (1.0 mai1 5r(v f+9zt8 sumb3o b3gzf, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the ce(tsgm3+zio19ub3 v 5rbaf f8 znter 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 1.0bfa ytdp8i2gb35;-jh -kg mass is positioned at (12, 0). What are the coordinates of t3i 2-dpjgf ;ybab8h5a 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 calcusey qr)c5;j1h)fk f 0q1qz q3elate the position of the CM of a whole leg including the foot when the leg is stretched straight out.hqj)q f5 es; 1z0feyq3kc)qr1 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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