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

1#

What is the SI unit ofc,ppd p7cp 0 tg5fvk7+ ezni a5bui831 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 cannonbv-*)aqpqk qnuw 2( )czall, 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 fri*h /x,vuo5f*zs2 shrah 6lyt9ctionless level railroad track at constant speed. The car issl9o/v6 f*ayu hsrht ,h25xz* open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sle 5m zdyx;li1s-d while sledding on frictionless ice. What happens to the velocity ;sdyxiz 15lm- of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equal mass. They are thrown z0u:s(rkku/iqa+8fl r *so d4with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum chl:rd0f+s ukk(sua iz*q4 8ro/ange?

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 /7vw9ocjgcd0yyzv) ; its kinetic energy in terms ojy0yg;vovc )9cd/zw 7f 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 twicytzv/;k9z/o 9 r8 zxbue the kinetic energy you gave it in the previous pitch, the magni9yx9zvz ;to 8/rk uzb/tude of 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;r)zq 9ylll7nzf ms ;( in terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation :to:headj(ybnyl,d *8r5 :0 lt m-dooof momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t) graph re2 oar+oi2 c -z3bv/gr1,b dutrpresents

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 ns 9p8 z i)8ubg iwdp hnrv762hz(6ag7an 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 c4ns9:9 ,ool ( gdb4maw2btp/lo u -cekollision. Which of the followuksd /nmlpb:lgc 42 t9 9-4eoo,aob( wing 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 blu48eoxu mca )ar meq.2m3 +zsl+e) are dropped from the same height, and rebound off the floor. The red ball rebounds to a h+4az.s mcro+8u e2qe xml)m3aigher 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 speed of 4 m/s, collides with a stationar*w*nj 8b,pmhzzk1 h:ly bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object exphwhz*k8 1bl*,mp jzn:eriences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

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

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce offs0la bq. +g1/af x 8p3v+krhzw 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,. df 4h70vvplfkml8s collides head-on with a 6.0-kg objecd4l78 ,.v vkh0ffp lsmt 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 linebacker moving at 2.0 m/s tackles head-on 0ywsyc ta- ek455m0ar an 80-kg halfback runni skwy e050r 5-m4acatyng
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 moi:lv-be.,i h jq f+5b; :dwq(eou:gq bmentum is conserved, then which of the following statements is true about kinelbq,hw:id 5fbgeoq;qe(b v+ i-.:uj:tic 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 ener96x ,dd ahnsb8gy conserved?

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 t) cgp 5-h2btjthe #5 ball and stops, while the #5 ball movectpb h2-tgj) 5s 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 speed of 6.0 m/s co a cin;2phs2.x54q4qn:b8k cz gu gty9llides with a heavy exercise ball at rest, th29 yb ns:qip4tx ng8a ;qcc zhuk4g5.2e 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 head-on col ,tg72a4hpoo,z nsi1wlision with a stationary bowling ball in a friction-free environment. If w 2ht417szia,op go ,nthe 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 elasticjzyv, pk6: )pbally with an identical ball at rest. What is the speed of the initially stopped baby6:v ,k)jz ppll after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with 1 7beg l ;nwuj;ox4wjrbc.*n )a very light object at rest. The collision is elastic, and there is no friction. lbww r*e.oc1jb) x4ujnn;g 7 ; The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed 7 gdetr6q igsdhwh ; i-: (/o+tc.3gmyv collides head-on with a very heavy object at rest, in a frictionless environment. Th:w;gdyc .s6r eiqm g3hd-(h o+7it/g te 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 velocitwn+mmp/n)+l tc6 m -sly of +3.0 m/s collides head-on with a yellow ball of equal mass moving with act6m/p +wm m+)sn-lln velocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving wi(wt0ugk ., dqsn9tdk 4th velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no frictnd9.(dgu04k kqtt , swion. 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 ne6 wxz*rd* k9conserved, then which of the following statements idrnzwe*kx* 69 s 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. xdtrt b9 5sw/8 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 t0 7w i.ep,jzvihe right at 4.0 m/s. It collides in a perfectly inelastic collision. p7e viiw0zj, 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 a7 , ldaj7es nq:p(pe)dzxthgb3l .7, object experiences the ls)7ha(zn.de, :7 ,x gtdq j7el3bla pparger 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 aiv 9x-nmqvmkw2fs8u6 gzn4y y q5m-3;nd 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 the follo7-q0en vjh*pf:g* uwj wing statements is false? **f0n-vwqh:j 7jpg ue

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 followic11x+anrp e* g8nnn*c ng is 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 walk with a longhn 6fr,wu+5d i+k mp1x 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 explodes before hitting the 3+:f;y lmgkhsc2raiqex,b, w:*6 hlq ground. Neglecting air res6lxg*:msq:yb f c+q,iw2lhra h,3 e ;kistance, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on auw(uve 3sex+ cimn,t:5/b5id level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the veloe v5u/x:5w(tsuic ,d3m +ib necity 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:q*o ve.slj1fu(i wc(1m*d8 iv:dt tq particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck traveling at b4- l 4*iudlghji*j(a35 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 ma)* r7 qh 0f;xq0poyifelqbk*5gnitude of its momentum?q qf )0r5x qh*by*0o;li ep7fk

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 whid3s9c 50uzoaen it strikes s30uoz5cd 9iathe 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 perpendiculawa /-qfcv ,xs (n;-qiikywm0-r to each other. One moves with a speed of 25 m/s due north and the other wxnm iykcw (fqsq- i/a-,v0;-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, traveling horizontab0n 6qgu5r:tflly at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the momentum of t u:6f0nb5 tqgrhe 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, initiall t6l. s-q8topgy moving at a speed of 12 m/s, is struck by a racket causing.6 -qt so8tlpg 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 thevcihr1q j g988mgsn2+fr2 m d( baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35rn h+ggq 812 vdms2r8(fmc9ji 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 stationaryrpi4 0e:i k/:qznuc+gz82g rk when the tether line breaks. As a means of returning to the capsule he throws hu:+qirzp4:g/i 8k kzr2e0 gncis 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 nirtyt-2) 5fj/s approaches head-on a large object at rest. The small object bounces strjn) ft- i5t2yraight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg mass), s+mq3 rukbc 33+gjrk+who is standing still, with open arms. As you collide, while holding each other, with what speed do you both +kq3k3c+rg3r+ u bjm smove 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+r4iyx 7c2mqibz1b - g level, straight road at a speed of 6.0 m/s. It collides directly withbxz+y7g 4bi2-q ci1m r 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 stoppe)9fu,c8 mtzd)g 4jldfd car that has a mass of 1500 kg and they stick together. What is the speed of the cars after tz ,m49uldjdc))ft fg8 he 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, ix8tqkz/; bk)ys allowed to coast along a level track at a speed of 2.0 m/s. It collides an ;yqkzk t8/bx)d couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction on a hor7um0balw *cgdf y37o 3izontal track with a speed of 10 m/s.c3*g3bldma 70o 7 ufwy A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at thj) qxbab-mhcnyow8p+s1 c *)+ e rate of 0.80 m/s (with respect to the log). With what spee b) aow1+xh )+ bsncqp8*-cmyjd does 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. T) mvjtczs 9x/tr(u9z 9he force suddenly increases to 15 N and acts for one more second. What impulsevz9z 9ur/m 9x(j)sctt 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 obj sp14gjkx t5we/db p661) emgcect. What is the object's change of velocgs/ectbmp 4e g5d1)6jxwp 6k1ity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30 m/s, collides with a brick walu7e:yskexv:8 p v4c ;g0xw,efl and comes to rest in 0.20 s. What is the averagegxcek; xeyfv e,870s::pw4v u 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/sy1 w+wsh z.fnd;e* scls7 p0t1. You hit the ball back along the same path, and at the same speed. If the bat was in conhpdlws f;*cwn sezy+1t 71s. 0tact 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 speeds of the ball righi8we;ne89/.te8cuhc yzeyq9un .) j ht 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 magnitude of the average force exerted ouy./zu8 e ehhe n9ye.q8c)nt;8ic 9w jn 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 bullets5,9uuu z.hf ood: ck*s, with a muzzle velocity of 750 m/s, at the ru oz.d:cuhu 5k,9so f*ate of 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 building in order to knock)wqoj u/ k5h:j the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocitjjh k5qw:ou /)y 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 hori3/e8f:j0nk 0 wxe mqmhzontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splan8ee jxqf0km mw:h/30sh 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 velocitluf.qtv :-jtk,ldq1 ;y of 40 m/s after 3.0 s, when fired straight up. Whal-tfk.:lj v1d;ut qq ,t 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 ku xed6)wcdr69d/x8u at rest in outer space. They push each other apart. What is their separation after the l)xk6ued w9uc68dx rd/ighter 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 wc f h7ec62r,joith a speed of 2.0 m/s. It collides in a perfe,j 7cr2ochfe6ctly elastic 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 with a velocity of 0.20 m/s in the +x direction gbv)/jfp ntw6tx:+e; 8+s +qsgdct f;makes a head-on elastic collision with a 0.15 k;xsveq;bptg+fst jnd 8wf+) tcg : 6/+g 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+ irwg04sue;nc nv p79 at 300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right after the collision?ip7n;u40 +cgewvs 9rn

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 struckv5;9t adn17ysb*tdg v head-on by an alpha-particle (which consists of 2 protonst;vg1bt 7nydsvd* 9 a5 and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collidesi n4xy6*qp,y47,s vbrtp,8j +ydxt gy head-on with a stationary ball of mass 100 g. The collision is el*yy,4dxt n4 y,qbvjys+7irp8 t, pgx6 astic. 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 a speed of 3.edx: 2wl. h(jl70 m/s collides head-on with a 200 g ball sitting at rest. ex l.(djwhl2: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 -bco6f q;-ukiby6 +fgw( k*7uaf3 soi5.0 m/s. It collides head-on with a 3.0 kg mass at rest. kub*6ag iywof(u 6cqs;+ 7 f3-ifb-ok If the collision is perfectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at ai42 r(klmbtu(7i 9 -po,utcd9cbkk,c speed of 4.0 m/s collides head-on in a perfectly inelastiuc2 ui,db7mkk9,4 p(c9tct -k(brloic 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 vb zy kil6w*k7u;i*xn /, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in *wl/k7b6;yuik *nizx 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 verttpv5i;mtwc270 4 prneical direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bp 4t0n7ec; twp5rm2i vullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east cnpp:sfd7 r 6p(ollides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See F(npd:7 r fp6spig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.ywfw5bw z bfxl;82g:) (iw o4i0 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 direction of motion of the cars afterwz8fx)yww5(2 w :; if4blgobi collision?

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A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Object A moves east with edz(2 m3 ob :ry5mnpv5a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s.5on2(mpedb5 y3r:zvm They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is moving toward the North with1b-1jdn 8isvb a velocity of 4.0 m/s. -n1 db1v i8sjbIt explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the 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 10s 8 d(k too,8wy(jx)q:*ydj pw.0-kg mass sits at x = + 21.0 m. Where is the center of mass on twxjo)(tj:kddy,w* po yq8(s 8 he 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 origin. One d z4932twwedk particle is located at (3.0 m, 0) and has a ma wd2t493zed wkss of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as 7a zn oz rb 3u.w)mt;:/jfmjb;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 o7jb 3wu fb:;za.tnozmj ;)/r mf 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 azw(,;j- tuqa jt (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center o jz-(juqa,w;tf 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 positionewmezr8sx+pal3 i3 7(cd at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are thelp sr3c (mai+ w8zxe73 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 positidr p*c/lxn,/sf 2fdjww2a w0:on of the CM of a whole leg including the foot when the leg is stretched straight outx/02c :,rfwsnl da/* jpw2wdf . 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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