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

1#

What is the SI unit of momen f)o9q02a q6rcx3i9rcfrq v+rtum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball, the cannon will recoil backward ay4s) 9d4fz iei.jxk6+o t7 j kxs-;sybecause 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 consq.zc3)m9fcs31xw2 c 1kaj yrf tant speed.f2jmz 1sc.yf3c)3r k9ca q1xw The car is 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 sled whi1booenvlh:e7b mn z)f2;m6*. gop -k gle sledding on frictionless ice. What happens to the velocity g)2b-7h.l:zp evf1;nm*o kobgnmoe 6 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 rrfn 7(*y y ;0 de0s96kqrxcmfare thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater r7x;rq d nrkys 6m0fyf*c e0(9momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving wit,;,g(v1 ai p wm-q(bnxrouau a49s8pch a momentum p. How would you represent its kinetic eneo mc ;us( (8wb9panrqai1pag v4-,ux,rgy 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 twicef,uwqgg am.*4ki ;8/,m.zhxbbknf0e the kinetic energy you gave it in the previous pitch, the magnitude of its momenmbn4xu,ki g. e /gbwhkq08 m; fz*.fa,tum 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 o4nc8mjd pl8a3 f 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 of momentumo7;ee/y*t+t/0 ikch t d v9tra *josu- de7y)n.

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 representss6fdf :a: *z8ffits/m

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 ac v-m (a va+hhd6vfreg95ks*2tm4ip 2scurate 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 3z281yv s4 dhm lbhvr;*2bpihin a head-on collision. Which of the following statements concep8 bsh213iblzh4m*;v drh yv 2rning 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 b tmt0);cu-e2t5jwgxjf ho gic:9 7gh9joe9h 2lue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher potw u5ht9 jgj7f0c;oemgt2c: heh i9)2xj-go9sition. 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 w +ksm1vzan7k rp7mn, 6ith a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which ob+ rkkm7ns 1p mn7,vz6aject 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 b5s*tc jy7rypw*e-a :counce off each other. Linear momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collid8ks5.gk9hxc l568 c tpc ia7woes head-on with a 6.0-kg object moving to the leftcp78sh g8wot lx5ica 69k c.k5 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 an 80-kg;het -/h( dsgl halfback runninglht; ( d/se-hg
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 mjtil4 da.cr elb(n/-- omentum is conserved, then which of the following statements is true about kinetic e .ajdl-n(4br /- tcleinergy?

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 energykt ka.b+-y(jw 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 the #5 ball and stops, w7syzvr)zk* at 4s.rn3hile the #5 ball moves away with the same v .nv 7y k*a)rzr43stszelocity 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;dorq1p0x wi 0 6.0 m/s collides with a heavy exercise ball at res1xdro ;0wqp0i t, the beach ball's speed after the collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the rigj5k lliyc,du4y6/a/ qht collides in a head-on collision with a stationary bowling ball in a friction-free k,l/d 6a yiq4y /l5cjuenvironment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 ex(fn ,j8uc:n m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the c 8xcfn(enu: ,jollision?

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 collidppn7ouu ;jlb7f5 g:1if;0 ct zes head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely tu ff0bpo:c ;7 u;j5gizn7l1p 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 collides head-on wb4djo o;d v+kd7.5mk/n1yf w aith a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic..no15+4 wvbd7dfa jk/y;mod k 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 +t0w gio4r5bnu; ) t. z,v0bdarg/cse93.0 m/s collides head-on with a yellow ball of equal mass moving with a nu g0 e /ttric rbg z;9)ado5b4vsw0,.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 with velocitpxg/wsy* phr ,57zvt2v0l b1ry v collides head-on with a very light object moving with velocity -v. The collision is elastic, andrvt2h p7 g*xb15yp0z r,v l/sw 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, if the momentum is conserved, the ,hxb cza*s0)h/a,bh qn which of the following statements is true about kinetic enerq)*0a sbbh z,cah /xh,gy?

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.e9p co risuq5+c j64)f 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 was nx qq2j4g6,m ,+fcto the right at 4.0 m/s. It collides in a perfectly inelasta jxcf 6q4wn2s+qm, ,gic collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Which object experif8q y7klaw3o-ences t3a 8wko-yq7f lhe larger 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 is deflected at a xi+goe05e/ je $35^{\circ}$ 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. Whichm dok:,s dmx6e 3,hng6 of the following statements is false , :dm6dm 6gx,hkn3eso?

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;4+ :xdls)jiqqwc oo //5uqe: tcam- ft?

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 h 7hjzuebyy)+s 0o9,, dex5q)eg;yl nrod 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 be . t**3j55,tjncd xwhfltgalo 2gt )s9fore hitting the ground. Neglecting aj2)*stttfo h *d,55 cg 3ngj .allxwt9ir resistance, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-free road. The collision wa0w :y+zfi4du 4bkzf4ks completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this syst+ y:ufz fkb 4kidz4w40em'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(5idlqwg6 -v/jzw, pm 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* ( zc:clmkjz 3wtvir5,e+z+ d a 2000-kg truck traveling at 35 m/s?

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. Whd0y2 ch7 twwv j+5e7hpat is the magnitude of its momenj77 5dc0yhwvpw t 2eh+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 12 m. Its momentum when -aen.po r(o8qit strikes the ground -ope .qoar8(n 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 movin5h ysp)k;b4v og perpendicular to each other. One moves with a spepy ho ;vsk)b45ed of 25 m/s due north and the other 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 horizontally at 30 m/s, strikes a w q btl+br8q1e(all and rebounbb qret+l1q 8(ds at 24 m/s. 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 6pe7v*9,xr ;jcjgafiy y 3p )f c*9zmemoving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite directioep iajmcf ,p99;rgf zjey** v6yx7c3)n 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 placed on (me,lo6j -wcca frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What iscc6(,mej l -ow 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 outsidy)rrzx+/pl 7,brln 3 se the space capsule and is stationary when the 7l/,) zlrrsnr3+ bx yptether 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-o/dvug4 otu7 xt rh+k8kqv.p8 /n a large object at rest. The small o7q8t/ v tukv4.+ok /grd8pux hbject bounces straight 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 y5x/ep k.e2.qbj ma0ppour friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what spe.0ep.2mj axk5b qp/eped 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 mov:f(j58 ilia p6d 4ps /pgnlyo3(jgi 9ves to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with ag 48:g95s fpnp(pll(va 6/ jd3ioyji i 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 3xj)9 ;8cb(tyk3buffkyjf byu q 4;d425 m/s runs into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the speed of the cars after ; b4d( juf4xkby ;y9cbju)tff83k3y qthe 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 level i;f2 )nqh:zsv 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 brakes released. What is the speed of the two cars avi:hf zq2 );nsfter 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 frictiondd.-q mh+/ .nkx4 xfsth/ o(fs on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4/n - +hmqdfos /(dkh.s.4txxf.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 4 vg d jti/orn8vif.gv/k8h9:r 2*qssto theig frs.8v2/ gdjro:q it sh/k8n94vv* log). With what speed 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 u,mc+w5 my*kj*, fgis/km mb:an object. The force suddenly increases to 15 N and acts for one morek/5mj,i*mm cgsub:, + ym*fwk second. What impulse 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-km3p3jsdoz ,uhyp;m 21jf 6u(rg object. What is the object's change of velocim2puhyrof 3zsjp;d1 uj( m3,6ty?

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 x6q..kk uc ws6q.:ov hm/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts qvxk u.ho:k.6cs6 w. qon the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the bal*2xzw39 d l:ml(pjxu)g/ohwu l back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, h)o puxxw/wjd2 *3g9:ll(m uzwhat 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 9- u+t3l5o aatvaep 0cspeeds 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 t t-3pa59vlo a e0c+uathe 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 ma 5hf3i5 v6 h/blt*kwanss 35.0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rah6vw ka f i/*nhb5tl53te 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 s ntlc*+a +mt6door of a burning building in order to knock the door down. This requires a force o* + a6ctsmt+nlf 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per + tjkudmfk,af+u:+ 0p minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force +dkfa jt+ +uufmk,p0: 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 40 m/s aft, d crdq+oxb7bk x11+ser 3.0 s, when fired straight up. What averagecb s, k1 1o+br+q7dxdx 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 (,u3 gdvcetnv8 5.axw6cq;.vy gcha : initially at rest in outer space. T wxcavadn8(u:h,.tvcyg q v3;g.ec65hey push each other apart. What is their separation 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. ;e2zs uk ru9w:It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after ruu;zke:29sw 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 an(p :7lr.b38lq ekemqq q o(/h 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 oq h87bq(nem: eq(/oqp 3.llrkf the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg blocux/-os m) btec3i(3// hhz2j g3 idqaxk 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 ibx3 33id2/ ah-c/z/u(gqomhjexs ) tthe collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an alpha-particle (which cons:+yjfdjqoov9vm m0p1 g4 m /1przg+6k ists 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 neutr4k+9mvmo ggm0yoj/pfv 1+ 1q6zdp:jron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary ball ofr9s1dx aqcyr,a e7.v; mass 100 g;cx7 .sye,q19 ardvar. The collision 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 m9- *2j ul/y ashtn5waa7bihg0oving toward the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. u2haa i *ny50tlg7b -a9wj/sh The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on wit q92gx*3hmw xqh a 3.0 kg mass at rest. If the collision is perfectly inelastic, whahqxgw23q x *9mt 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 a speed og3(2sof+ns b:j rcgk5f 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost dubn+sg3c2(:r k5 fsgojring 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 velocj*k 4ef (h-vhoity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock togethere ( -vhof4*hjk 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 dirempz3j 0rvhex3ma 1/ :bction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves vertically upwah:vp/mbex3a0j31 rz mrd.
(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 collides with a 3000-k/te*;r;idbxyi 4zq+e g car traveling at 60.0 km/h south. The twrteizq;ib4/ *;xedy +o 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 travel pi:vze*sgz-wvm*bk sn am4(3)df.7 qing at 90.0 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 after vka:3q4s-*b) nev w.m* z(pismd 7fzgcollision?

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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 frictionwc6t91l;uw wd less surface. Object A moves east with a momentum of 24 kg; wd6ulct ww91m/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the 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 masianw4 ou zdj xd/n.a84c1 h,(cs 10 kg, is moving toward the North with a velocity of 4.0 m/s. It explodes int z(jcnnuhd x8c,.ao i1w a4/d4o 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 10.0-kg majyw61/kfiwu b+cm*:a1 4z3: hyd fi gmss sits at x = + 21.0 m. Where is+zc1/:f:4 y1iabm6fkh dwy gjw mi3 u* the center 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 of a two-particle system is at the originj2/c 9o84mxoleal ww*i)ara 20e)s4o-cu dnr. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. l acde90/n)4 *)claxu-io 2 roj 2oa4s8wm erwWhat 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: rgf;n3remp 8g1lv-0w t:lck0 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0).3l80:ge;-p 0fglkwrct n1 mvr Determine the coordinates of the center of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg,tz) :uwi,tza- 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 center of mass of the syst-tza:i zu ,)wtem?

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 positi rc od48vkc z2vuk67/coned at (12, 0). What are the coordinates of a 4.0-kg mascockv4 62v8 dc7r/ kzus 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 /w/l24s4( *ykmb jvsqil6 iqlCM of a whole leg including the foot when the leg is stretched straightwbk4* si i qsvm/q /4ll(ljy62 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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