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

1#

What is the SI unit of momentu.-9rft)l bu xzm?

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 aa-dw)bw, rz2eduf 56h cannonball, 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 track at constant s 9.d pdunxr-5xyt)c ,t)pqr;: mt7rxh:y qv q;peed. The car is open on top. A large load of coal r;dtc,p y :7y9xrdx:hq)-q;mtxnq5ut. vpr )is suddenly dumped into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on frict-+ssl /yd,vmuc1 6hyf ionless ice. What happens to the velocity of t6f-/y+d us m1yclsv,hhe 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 with cm-6i2fvkq8ljnd 3, kequal 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 momentumkf ,-v683n lmcjidk 2q 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 i km)yjx,2e3 rru0 ib0ds moving with a momentum p. How would you represent its ki u ry0 k,d2e)imbr3x0jnetic energy in terms of these two quantities?

A. $p^2/2m$

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

C. $mp$

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

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the f z(gtdz zq-hj ;7bzl m:q:i 011b9bpnkinetic energy you gave it in the previous t-1b pih(nz :gz07;q jb1dbfl:9qmzzpitch, the magnitude 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 in tcze k 75xq1ky5j(u9fwerms 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 conservah3*w psy(z4a8fl jtzf/okfu k ,5by+) tion 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 d2qi98ecwa(yversus 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 iacmd0s ju;c:rz/ az1r pj3,;xs 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 collision. Which of the focw ed/e,/.b ynnepc5 +llowing statements concerning the magnitude /y/d,e. wnbne5c+p ecof 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 thwbw9y.hll (h wr *jk1cur .-e37pb8p ee same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collisio-p7lhw1u rb j e9*krwly.3c(.wb he8pn 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 of9gqtn7mpp7 .e1oq9q a 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and thet9a q1.nq7 g pqmop7e9 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 bounce off each other. Lineariv.- kq)-6m ww:wsr7fbolf h:, g4ezi 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/irx w; 6odf;3x)fu jntf/,ud at 4.0 m/s. It collides head-on with a 6.0-kg object movr n),ux3xjfdfi6w;ut /odf ;/ing 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 moa7x e:had 1is );ta/skq if:6nving at 2.0 m/s tackles head-on an 80-kg halfback fe x nqaha:):t6 assii1;d k/7running
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

D. this is a simple example of an elastic collision.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, t3)y i2z6djhhb9 xw9un hen which of the following stwjhdnzi uy)392 b6h9xatements 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 co fhww0g uo fg4tx*h0kv:j-i69nserved?

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 bali7:)zi+ s*pb;pp boelw5n r9mcv 4z8ol hits the #5 ball and stops, while the #5 ball moves away with the same vel ;w)z ipzml48bc:+p o7nre *vs9i5opbocity 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 spj*m6a(hws 76e-f oakoeed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collie7s*kh(6 of jw6a-maosion 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 m5 5 ljar;7apim/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the mlr;5paja5 i 7collision 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/se yphl0 x(*1lm collides head-on elastically with an identical ball at rest. ml*x (pyeh0l1What 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 3 sfggq72 gkmy7wq0 ycq5c2.e s7g4ur moving with speed v collides head-on with a very light object at rest. The cmg7 qqk yu g .g7f qcs4c2es25g3y7w0rollision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v hj u9r+gi,06p vtnqj5collides head-on with a very heavy object at rest, in a frictionless environmiu h0 6tr g+vjj,npq59ent. 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 md*3b 2u9 v mqrfu)2jea yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the vf) jd9 b 2uqu*e3m2rmvelocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides headnlqs,akj7 o: k8 g* y2leih;h8-on with a very light object moving with velocity -v. The collisi*8all,k 8nho7e2js hkg;y: q ion is elastic, and there 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, ifzcklsqonr 28bvvd/ i/ tb r9v36,6wq* the momentum is conserved, then which of the following st*l9knvv3 i6z 2bd8r/v/q6qr,w tsocbatements 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 eijiqmwa esgye.han1 )0j(9b r10a);a nergy

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 m84*8mp ew z0 8)uwfl5zjq0/f :ouk zkqmpgcv./s. It collides in a perfectly inelastic collision um48pk z:jo8.zqvwl5qe) *kfw08pcugf0/z m 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 anj9 jls)b -uv*wqho--d d sticks. Which object experiences the larger mag)j-l --sdb *ovwjuhq9nitude 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 7 ertpc mwb 1jk6j*95*+qfo d+ies9qrwmx72 scue ball hits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the followin(.-fwu4mutcri6 0rrktb4) nzg statements is falserzf4.tu(6rtcr-nmi4 0)uwbk ?

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

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

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

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

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a false statemen-z0k8dc gdyu-go e z(+t?

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 hl kp/ld1 ( (hj*k,rpdwith 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 explodes before hitting21 6emr1 inbh6hkp5 wu the ground. Neglecting air resistance, the cen6w1rh kuehn2mb 56pi 1ter of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-free road. Th )m6j/).vicf2 l8x p s4frbj 4iazdrl3e collision was completely inelastic and both cars quickly came to rest during the collision. What is true abouvb 38lp.4cr24fm)jrzi 6 /dax l ij)fst 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 partic sdz+m/:zb op+swklima.anf5 .-.+ wkles.

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 jgf9z ahgr4 ga3o1) po*8b-;w5.ngog1oyakv 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. Whatvl2m(o8* 0jxsms / avk6jkk )x is the magnitude of its momentk/los6)ak x*08(ms m xjvk2jvum?

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 ffl ,ow-+vpsh+x8jki0iz,mk )rom a height of 12 m. Its momentum when it strikes tl kfs+zo0kipmw8hiv, )j+-x ,he ground is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendiculayap9r,k -w)bkxsf *g5r 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 the total momentum of the syst f b-x5a g9kw)spyk*r,em?

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 m95 ayulzcx 6tw/ g9wd1/s, strikes a wall and rebounds at 24 m/s. What is the change in the momen wcwy xt/u9 z51la6dg9tum 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 8 ;ng k-qf nd,fvu(48gfgnf3bm/s, is struck by a racket causing it to rebound in the vk f8(8dfn-g3,n4 qfg ;bn ufgopposite 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 the baseball) is piljh3 4 w fn-+fdbt6r;laced on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligiblbnt4 6d w+-hj;fri3fle 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 theua+hl7 lc*9j n space capsule and is stationary when the tether line breaks. As a means of returning to the capsulecn*l9ua h7j+l he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches head-on a large object jrpv r :-xri,y88nhf4at rest. The small object bounces straight back wijr4nirv fpr:8x,y h8- th 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 gre cstr p6w,5tc84f i*giet 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 msttpri4 ,5g cciw* 8f6ove 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 a) ak96 unyi0ifn l/5pjlong a level, straight road at a speed of 6.0 m/s. It collides directly wj6a p9 kni)yf5l0/uinith 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 intonr:j.l;seoxp q 8 *-uz the rear of a stopped car that has a mass of 1500 kg and thrjp.:o8e;u-lnz s qx *ey 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 allowlre bq5oxi79 -ed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with be oxqi5-9 rlb7rakes 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 fric.6jiso kjb+p /tion on a horizontal track with a speed of 10 m/ jb. kiospj6+/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.8t1t b)t3bhmww 3q5o x60 m/s (with respect to the log). With what speed does the log qwt36htw )o b5bm31t xmove, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force sudd 2,b,g gtj alm1k:e;: axrrn+eenly increases to 15 N and acts for one more second. What impulse was impajkmaxra ,,ge: rntg1;: +leb2rted 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 o4 -,sa5u scjhpbject. What is the objecups, -c4sh5 ajt's change of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30 m/s, collides with a brick.,t ktchq-m zd4 5td3x wall and comes to rest in 0.20 s. What is the average force the car exerts on the wall?t-tk, 3xtq5c z md.d4h

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 bally(q:b+fg 6roy back along the same patqb r:6ogy+fy( h, and at the same speed. If the bat was 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 top. The speeds of c8t 4hm2wic4rn-k qs9 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 magnitude of the average force exerted on t-ri c84 4qncsh2kt9wmhe ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzzle velon/ x 2vtv q he.+nrpbu-nioq)b3: ;zo2city of 750 m/s, at the rate of 300 rounds per minut2n :; 3xoenbv -qir po/h2v b)z.+qutne. 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 y2 m g b 5)sussnx7th(4l*vtk,a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimy(v7btxms*k lt,)n5g 2 s 4husum 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 minute./l 9g/urj5e iurv3u)pa r-wp) It falls 3.20 mwj)rpupl5e )r//auui -93 r gv to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 0pom7tzo .r+l sya.q 840 m/s after 3.0 s, when fired straight up. What average thrust force does t ot 7o8l..q0mzy+p sarhe 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 rpwnnpjg xm2r4/os21 2est in outer space. They push each other apart. What is their separation after the lighter astronaut hox4/s gnp 2prmw21jn2 as 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 afocq/hb45t:neufb 4g3 s k1k, speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object mof4h,ckt:foe /43u qb15 gn bksving 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 withdv/r9*ff fj2 p 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. What is the final velocity of the 0.10-kg object f*/vfj 2r9fp dafter 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 30zw3hw95 ck g7e0 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get embe5k3gwwz97ch edded 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 al(hgd 9 evi s:91u1yhscpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is complesui( c hv1hgyd91e:9s tely 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 collt (oggw ip:,6.um8yleides head-on with a stationary ball of mass 100 g. The copt .gm8 le6oy i,(gu:wllision is elastic. 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 3.70 m/s collides herkf w6 09xzvvl:,6lon/ff c bx:6lv;sad-on with a 200 g ball sitting at rest. The collision is perffl6 v/r6bs xc6v; ,f0 :fo l:vlxnk9zwectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on withf+ n-l v4il)43 ytgm vgkin;7t a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is t;l4k7yg git-m+iv fnn v)43tlhe 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 a speed of 4.0 m/s collides5alnva6m rp++ head-on in a perfectly vm prl6a+n5+ainelastic 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, travekofkw6z*)qc y ,ga /c;ling with a velocity v, 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 ener/o af ygk,zkw c*c;q)6gy 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 direc4vn*s xqy5l 3rtion buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combinatiovly5q 3x*rn4sn 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 collidemt )0s(l-,d pbz2q* 0rnwvptns with a 3000-kg car traveling at 60.0 km/h south. 0n)qrnm p2l*w(z d -s,0vt bptThe two cars stick together 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 traveling at 90.0 kxq1d/i-41gn8r eczzjp7zdp wn9wppg 9; ,d 0km/h east collides with a 3000-kg car traveling at 60.0 km/h southic 0,19z/wkg8 -qg4z9rdpdpn1xj 7 nwzd ep;p. The two cars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level re17(f,zx5nfyf 0f+ t, 5vurqtkk9vp 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 magnitudq1fx+f v,te5v un7tky rf9r5 (k,zp 0fe 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 .iup3v3ki0hzq.) f tz,1 arr etoward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and t3ph ,1e0fz) avr.3 .uz iqrika 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 = + 21.0 m. alg97a /i;l xeWhere is the ce l;/ l7axaegi9nter of mass on the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass ov4s/ y8qeoyp 4uozh*7 f a two-particle system is at the origin. One particle is located at (3.0 m, 0) and has a m7s8qhyv/oepu yz o4*4ass 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 follows: 2.0 kg at (me+i: wg- qw)k0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center o)g- m+iqw:ke wf 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 locatedo5hyn b 4z8 )revheinvc1k,sxn4l:6 8 at (0, 0), (1.0 m, 1.0 m), and (2.0 mneh besr6n, xih) 8v zklcy45onv4 1:8, -2.0 m), respectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is p8*3ohbh,q iovae*qu 1 ositioned at (12, 0). What are the coordinates of a 4.0-kg mass which will rqubo*3vi oh1 ,*a 8eqhesult 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 calculabeuaa1avob. q:/.- : ve7zyegte the position of the CM of a whole leg including the foot aabbz/veageqev -u :: .o.1y7 when the leg is stretched straight out. Assume the person is 1.60 m tall.

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A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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