Physics Unit7: Linear Momentum - 题库网 (tiku.one)

1#

What is the SI unit of momentum?;im. 5ux lxehw:xzl-+fln1a8

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 cannonba py5.kwg+1qlso dui47ll, 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 frictionlessppnb2iwl7p(p 55 jf cwm4 ur7/ level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happen/p27m7p5jw4 c 5i(blnrfu pwps 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 offbaoutr/iph9- y f 077a a sled while sledding on frictionless ice. What happens to the velocit7i/ uhoab-7tf 9pya 0ry 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 mar-nl7tej z yl:8r1n+wss. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experienwl+r7-r8e:1 lzyjn tn ces 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 mvncftf2:,ry; fb y-i5oving with a momentum p. How would you represent its kinetic energy :ri5ff ;,v byfy-n2tcin 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 kinetic energy you gave 6bddhw5o/y/ tpes s6nu()se, it in the previous pitch, theey),bssue(5s /pn6 do6h wt/d 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 terms of mom9f3go;hrhd-wu4 7 sce05tq n kentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of moo6ht n5*bpfjipj/4,7 v8re s jmentum.

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 0np jn ,bl64igon a Force versus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate statemeokvv7 6t-(ww/ (f kgqfnt?

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 cktzy(e, 0ph u/ollision. Which of the following statements concerning the magnitude of the average z,kehp(yut0 /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 the samk ajv ;.nu1,bye height, and rebounn ,1y;kua.vjbd off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball movin3wak (fu*nw.dg east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiencef(uwwdk*na3 . s 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 ofho q 7;5n fz8ugm3:uwr 38nvlbf each other. Linear momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on wp0mxq33 ;6 sftrv /ykh..tk-zbjflx8 ith a 6.0-kg object moving to the6sxjx0. 8m3lzkpy. tq kfrfht3-v/b; 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 hem7,;yhwiqaf /ad-on an 80-kg halfback rw,7if;a hm/qy unning
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, then .zjil1(z3 k tdwhich of the following statement(3 z jl.tkzd1is 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 conj7/u.hrk,eb2b l;o/gy ybk2mcu 96 l iserved?

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 ball and stops,zt 7z 5g79 c3qyvfrf65y5ftvc while the #5 ball moves away with the same velocity as the cue ball had originally. The tyfzv7rv5 z 3 9f7gf ccqy6yt5t5pe 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 wigjl5k/i 1; o+kx*(w7dtiayykth a speed of 6.0 m/s collides with a heavy exercis1;wya *gk(tdik7 ox5j/k l+ yie ball at rest, the beach ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.02g* c,l,m-u q *kuqa*ca7gp0udbwr5g m/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 a kr *mcd*l*gquq7pgbw,2-5 0,uaguacfter 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-hmo eq/60 40n hw.yv0; :dcl prh:geqron elastically with an identical ball at rest. What is the speed of the initially stopped ball af:py rgrnecleo0vw 46dqm0 ./:hh;qh 0ter 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 ck)x0*mey7c lxc:oh3 fsl1b b/)r qi e1ollides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed lm7b1 i kr3bcqy*e hc:xs)x/e l1)fo0of 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 vloppxuqy.x2nyz7vgg 660 6 0b collides head-on with a very heavy object at rest, in o6 xgux6np q v00ybgp72.zy6 la frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s collides head-on with a yellow v*ec x,-)vxo7 zhw u)qball of equal mass moving with a velocity of -2.0 m/s. What is txxh, zvoqc-*u )wv)e7he 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 with velocity v collides head-o:rvyvs/fi l*1 qy7 q lbxwa./ot,0ln 2n with a very light object moving with velocity -v. The collision is elastic, and there is no fric /bs1*wyqx0qa l,vi to.nr7/2lvf l:ytion. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserved, then whicgtqi9x u4j njj-9,nlm+ 0w ks)h of the following statements is true about kinetg- k jlx,mqj40n nuj9 ist)+w9ic 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 stic hc6+h95 pnarvyam5+vljb4(mk together. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inel meepkgwa:*pd,d d 06 )pfm,qpo .*y)fastic col oy)dmd.qwf*6 , kp* 0pf)apped,ge:mlision 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 e:nr;x +(lk rogxperiences the l org( +:nl;krxarger magnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and wcso )3p h06tais 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 fol+cv0y5eokz7oonzg:e l ;(yr 5lowing statements is false+55vn k7e gz0 o;yo:zocl (yer?

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 i.1 t5;lzunlttj)i.e qs 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 long flexible yub2gm5( h5 m,-r ofuirod 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 thd d4t 5tvata96udvg/1 u./ (enqc pgr8e ground. Neglecting air resistance, the center of mass of the bomb fragme uta418n tt5d.vcgup(d qe/96rva/ d gnts, 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. The ;56: igpdt f6 kukhm;)duzru .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 of fit5 d:durk gpu6;hz;u.) 6 mkmass?

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 laymtcsoa)2 r3ksvw,14 w for a system 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 traqjmp599f8cs1emo t 4 14eq ruqo9ok )rveling 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 sout k5mvx++c cwb8h at 20 m/s. What is the magnitude of its momen v ckc5xbmw8++tum?

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 k80rads *jjzhpwp4i jo+9 3e2xo/i /o12 m. Its momentum when it strikes /0j4+ e xojii 8ko3*w 2p/a9dzpojrsh 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-kp j t,c*lv/ka25te ;bi mwa4h+g cars are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at*tv lhwp c; tk5,jm/2abae+4 i 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 horizo dv)zl9 6sd1.tj/zt (f;n sqmontally at 30 m/s, strikes a wall and rebounds at 24 m/s. otzz6 mj sqf /1)vs;t(d9d. ln What 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, is deai+ lrjb8 b;:k d:3pstruck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. rd:bk+;aeb:3 il8pjd 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 (ex2 :rnrpho1* lfcluding the baseball) is placed 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 negligible flo:*r rfnp2h 1riction.)

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 stationary6cky3-bln, zk4v y3w i:pbfa6 when -ak , wp3kf3blyz664 biy :nvcthe 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 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 q/ ed)j4 1u1 0e,klkrts2rdnuat rest. The small object bounces straight back with a l4ee/1jndtru2 s u1d),k0q rkmomentum 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), who 00rosxf 6 5n3oqnx 9z(lu g3xsis standing still, with open arms. As you collide, while holding each other, with what x3x6 fnnr30uqgo5l0z (xso 9s speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the rightun/gk-ozbsbk).o k/g 01 9elt along a level, straight road at a speed of 6.0 m/s. It collidegol/kb kse ob-z)0t.9gkn/ 1us directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear 9yq.vxq6z ,at8bf55.gf di plof a stopped car that has a mass of 1500 kg and they stick together. What is the speed of tvf a55yp.g d .q9iztlfq86, xbhe cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a levetxs7l ocx(+ e n+pb6+cl track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initia lt +xx6+bsp+oe ncc(7lly 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 cmet)nv-ow +w5 p8k5ha horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of8)v- wwemn5co p5+tkh 4.0 m, and lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.80 m/s (with respect to t j5w 07j:wnh0el,cucu9i pdpuj9 -g5 nhe log). With what j-u de,7:upph c0 nu0wj5il 959cnjwgspeed 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 objeydfye 6p 62;j lgjk4 xkhd-y):::oea bct. The force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to he6aly :gbo)xy:kd2j6 : 4f;kpedy -jthe 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 d 5w4hj3cn9eu r 0f2jl2.0 s on a 6.0-kg object. What is the object's change of veloc2rd f hu04e53j9nlw cjity?

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 bg d0sxzh4b1 a5rick wall and comes to rest in 0.20 s. What is the average force the car exerx1bdh5z04sa gts 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,qte4jwvpz 7q .sl. k, at 20 m/s. You hit the ball 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 magnisqwjkp.,z.vtl 7 4e q,tude 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 ontfbrg1b fuy0 cwa:5k52 stq71io a table top. The speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between thfk:r1w7u 1 fa5c0s5 2 bbqyitge 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 bullet *3sm estb-+xl s99 bwa34ydzns, with a muzzle velocity of 750 m/s, at the rate of 94st -ymal*+xzwnb sdse3 9b3300 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 au c)zowj i4;h4ba;8a the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assumingha8a4o;jabw4 ; iczu) 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 r t2 2bdtlb8,lpate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up2 2 ltplb8dbt,, 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 velocityig;6xtov p 5r8i1h:cn of 40 m/s after 3.0 s, when fired straight up. What average thrust forg6co: hipinvr ;tx1 85ce 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, q30pr+ n 8d zx4qxdv bu5u/yx(are initially at rest in outer space. They push each other apart. What is their separatp8u xrnqxv5u3q(z4 /+x0 dydbion after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a speed of 2.0 m/s. It collides if42 fz)2 8w zermyhr 1;omehy7n a perfectly elastic c7hr rffz8e1ym2y2w hzemo 4);ollision 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 dixe+.b2-1jlkdp f 7c mw24q heo/ wap:irection makes a head-on elastic collision with a 0.15 kg object initially al4w: wmf+a ehco 22 bqiekx-71.jp/pdt rest. What is the final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is firedb(ij.xg sms/3 0qm; gi into a 1.00-kg block at rest. The bul b3mxsg 0; gj(imiq/s.let 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?

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 hea20jpf:6d xfe p:r 1ulnd-on by an alpha-particle (which consists of 2 protons 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 massfrf p 12ex:n0p6u :ldj 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 ;qslcco7wo16;bfs u++10 m/s collides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after the colls;c6+bw1ol7ouc f;q sision?

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 b2kfx6r4, -qe j3jsv cof 3.70 m/s collides head-on with a 200 g ball sittinr-3 fqv,sjk 6jbx 2c4eg at rest. The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. Iti 2l,0gev qvs )hav4b*34ua zj collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the sa qsij vale2z*gh v)bu440v3, peed 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 collides head-on iny3x6-klb 6(c rn lz;isr9yz. p a perfectly inelastic collision with a stationary 2.0-kg mass. How much 6nk 6lb lz.-rc93rysyip z ;(xkinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station w,5xz3vegj3ah12n xqtt2cfz d+c tk 85agon, who's mass is 2m. The bumpers logxjza x ,c351tv2kdq2nc tt zh+fe538ck together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction buriar sy4 amg2jm;)3b8 ddes itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves )ramy;84jg dd23msa b 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?

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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 qkhqrquz:88e3ahz2 zqr78k2 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The khzz8ze rqq88q:kqru2 a 2h 73two 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 km/h east collizyz66z.orflrh0 - e1xhl)bn8des 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 after collisione60zxh- l61r rfnlz8o.)y b hz?

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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 kobbipy7oj56qe q1ye2ch +y +/te; c) surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s.1ybke+tc75 b e y yqo+6cih)qo/e ;2pj 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 witl/ukkq/0f wq11 1gqwqyui 6z)h a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1y1uk w6/uigkqwq 1)z 1l0fqq/ .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, asm0tj k lwpep5;h4.: knd a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass on the x-.k; 4pl s5 pk:jmhe0twaxis?

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 originy2ro7; e b(dng4 (peny. One particle is located at (3.0 m, 0) and has a mass of 2.0 yrg2 7b(een4np;( do ykg. 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 (0, 0), 2.0 kg at (2.qv6smj w2n5 o6v rh)epw) 6 sr*4fsze 6yerw3(0, 0), and 4.0 o) 6re(v5esfj wwv2rsz 3 yrs ew6)6q*6hnm4p kg at (2.0, 1.0). Determine the coordinates of the center of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kgn4ka2j/fw sm ., 2.0 kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the centk4 /w2m sf.anjer 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 a 5xhe s0lf kui h2,-bd7swiiy70c7 4 z;awb5ctt (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates ow;s7,4 alz uebi50c27 0x i c-hdh iywfbs5t7kf a 4.0-kg mass which will result in the center of mass of the system of three masses being located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the Csyqer(v)xhh vds,l ,-h*9 8uzM of a whole leg including the foot when the leg is stretched strvhh8v)r-yd ,*se lqxz 9 hu(,saight 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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