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

1#

What is the SI unit of m:pl5 xx(3+ .vyaj+q xer7wsbpomentum?

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, tlgunkzpx k-zz3 6vnl):-x 3 v:5p c-yche 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 aohe. 1khxc7p) f5 df,d frictionless level railroad track at constant speed. The car is open on top. A largk,o)hd1 f. 5pefcdh 7xe 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 while sledding on frictlm q.khcxlv,mp (m665y;n)y e ionless ice. What happens to the velocity of 6 .qlypml5 vhm ycem,(;)xk 6nthe 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 pute(6tg5a)pz)mw7g ,z cmguf l; ssq-v3ty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty stic3l m6; u7zgmgfz)(cw),pvsesq-5 agtks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentumo hwe-:ur/9 cgffrxe)8 5vs6u p. How would you represent its kinetic energy in terms of these two quac5uu:f )hs8er9r-fv6o gew/x ntities?

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 baseba)pr+uon71xy cs cavl ,7l4k2sjvuufkm z( 987ll with twice the kinetic energy you gave it in the previous pitch, the magn9a jksknvxlu71 up7ul c 7+ vo,)42(rymc8f szitude 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 lc0l*i cy36+jscl 9ptgqz+2rwaw in terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservationc m,:i/q 9rowj9i0wbklg51uv of momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus t6a isjep8; 38. j0-i7r9abgnt pojlo sime (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 statemenrw q,tt(v0z3( jy,5ocko mqw 3t?

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 dz6 xbl;-mx7-c iq 7zrin a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correcx x77-zil ;mqdbrc6- zt?

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 reh 0w*vj5l1c kpd and the other blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a highv1chp k*5ljw0er position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, coln m) s.+so2ty ;,kkkzblides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves ;kko,.s s +n tzbkm)2yvery 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. Linear b+fg srvl6n5iz7h7lws) p91wnoxj67 8 du.numomentum

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.z+c+kh ia hfq41 x(xppp)9xe. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Whxfppe+zhhq4 a(x.pxk)+i 19c ich 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 antyp ei1vt*3lzi u4 p3, 80-kg halfback3*,t p4i y3 tie1pzvlu running
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 consergpj0-kax h2gab 51 z0dved, then which of the following statementspk-j02 g h01 azxdbga5 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 consb)hecke8i ,v; erved?

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 br6o xb s6,o4moall hits the #5 ball and stops, while the #5 ball moves away withxm oo 664,bors the same velocity as the cue ball had originally. The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

D. any of the above, depending on the mass of the balls.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a0ay 9n72+z2m-8f d zzz fvxbpn speed of 6.0 m/s collides with a heavy exercise ball b2v2 p+azf0y- mf xzz7nnz8d9at 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 3.0 m/s to the right co/vsqyrdhi f*.welx /mj 1 :o45llides in a head-on collision with a stationary bowling ball om/ s5rld*.i4h /1:jefvy qxw in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 50q xxn,one4/ d.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the ,0nxnq4eod/ xcollision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a v baao2*rbw; 4mery light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the ;a awbb *m4ro2light 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 wgujjwy8utg / r.c f4gdu/6f)p7)lt4/8yze dspeed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. Th y w fj47r pgf).d8tuew86// djt/c)g lug4yzue 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 veo0 lf-uys j8 a x.+d2l/ahbmk:locity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball af-k yf/20.xdu8j :msaal b+holter 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 collidu7e3yy hrd( 1ses head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object 73ryd 1(ushyeafter 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 conserv( )(ac k+/r wwdwynlj-ed, then which of the following swaww)y +- j /n(crd(lktatements 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 energyyuiis,.hsn7*le ) .ju

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 thevz7 e7kds4wjitbq4z5ui on1td5) . f6 right at 4.0 m/s. It collides in a perfectly inelastic collision witzj et7kbq )z5i i7441 d.son f5uwdvt6h 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 experienceqs3gw+ p znsvoei8i l;9 u53b5s the larger magnitude of mesqig pvz s5w8+;b35 93olui nomentum 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 #jxpbj,,zyk1 yt c8f8xmz(unq 2oh(7 8 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, Mk*k*tusv+ 8kd and m. Which of the following statements is false8sk* +kdkt*vu ?

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 7jv4-*yukaj 0ee: )srw.d yygis 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 longs k0 .zrgb7s evx:+xla)i:+gr 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 043 0i-lx ,fqdhnajjwbefore hitting the0id,wnhaf0 q4x -lj3j ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on9; rcwl ooh90qq tk.e3 a level friction-free road. The collision was completely qtr0ko;3 9lh9 eqowc. inelastic and both cars quickly came to rest during the collision. What is true about 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 fft8 xz sp(h(qq+b: fn)or 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 travanv818 ly7 omdeling 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. What is the ktul l: om1/r+magnitude of its mome mt: 1l/oklur+ntum?

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 momentun s9(x9dh/cqkm when it strikes the ground is(s9nq9cxd/kh

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 perpendicular to each other. One mov r(qz0vafnhm*wtn7 9; es with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the t 0v z(wt7nfrna*9qmh;otal 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 vdk.n5jqk4id6b6 rs9at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the mok6q 6.snd4jb ivr95kdmentum 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 fr02u uw .-v+h;fxlh dstruck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momen0 ufvh d.-ful; 2wx+hrtum 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 (ex oet:uauqq11 z2yl9w(cluding 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 tw 9atluq 2:qoeuz1y1( he pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking outside the space capsu1-, f62owdrls+ttip cu vic9 9le and is stationary when the tether line breaks. As a means of returning to ttlr,ipo9 v+f6tidc cu-s19w 2 he 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 )+ii o(*alplj momentum 5.0 kgm/s approaches head-on a large object at rest. The small object bounces straight back with i)ajpil (ol+*a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your f78t2s q6spxji/f) r 3 x:hrwnsriend (40-kg mass), who is standing still, with open arms. As you collide, while holding each oxpwxj27s3) srfih8: tn/ s rq6ther, with what 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 oczmg: ps:ek+- y*gn;right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg.ecz m-pns :;yg+:kg* o 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 +pfc p+4 3yedkinto the rear of a stopped car that has a mass of 13+ py+ ek4dpcf500 kg and they 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 allowed to coast along a level tra:qj;j2r lzpx:tz/7o;wc w6i yck at a speed of 2.0 m/s. It collides and couples wi z;t: c;2:x/6ijz7 pwqyorlw jth a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction on avkg3a +(x4p 6w uq(juk horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m u34gkxvu j k(a6qpw+(, 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 respectvn4rz1pad; )l lgt-u7 to the log). W1vt-za ;lp)du4g l 7rnith 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 h)r7dl4 2xxmx +re d8fan object. The force suddenly increases to 15 N and acts for one more second. What impulse dd82exr)x r7l+hmxf 4was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6.0-kg f gc -fb*mznr8(s-z* y ky0p1sobject. What is the object's chanp8g zs-y-0 *kfr nfcmsyb(z1*ge 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 ayilmrorg, p.eruo7 93 ce55 j,vdp)r3t 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average fo .35dmg7 5urv ,oj y3e),o elrprcri9prce the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the ball back along the w3lta 5g (+j1:nk,gk)stiqo/j vx 0un same path, 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 ko3v, l kg j0stjtn(1qa+x/u5nw: i)gforce 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 speea nt12 v5f tubw+6hyp)ds 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 the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on 5t)y1wafpbth v un+62the 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 bulletf(y e 4ism1kcp75qv:ts, with a muzzle velocity of 750 m/s, at the ratee :5mc ytpf4s1q7i (vk of 300 rounds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building in order to knock thz13ar9l x jp.x .9ub*5kxoxlie door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimxr.9lza*jik bp1 xl5u3x9x o.um 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 hori 8 .d6j.ajf1sj ) uj0mtixs,pgzontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the w60dut spj1j.fx i jg8 ja,.s)mater 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 x:d djq:n( d3)vku q,uof 40 m/s after 3.0 s, when fired straight up. What average thrust fk ,d:u dvuqnd()x:q3jorce 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, arel(uwxfr ix )0+ initially at rest in outer space. They push each other apart. What is their separation after thefl(iwxru )x+0 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/s16ek3*hl/ ss6 btjl y5x3vm us. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is t/ev sxl*yk6j hmlt 63s 53b1ushe 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 o:c : uq1 df1zx1qyg*l s1xbg.)0cdbua velocity of 0.20 m/s in the +x direction makes a head-on elastic colsc: udg1c:bxxofl )*1u11zgdyqq .0blision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block a.ayp p:gc 9e4b.(exfqt 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 taqxp9b: f g.y.pce(e 4he 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 alphaqew/p/l8 tqx3pon0;ih0bk)a-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 mass equals the proton's maonhqq)3l b/8/;piekwa0 x p0tss.)

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 ballutzg012 it9 jv of mass 100 g. Tg2t1v9u 0t jizhe 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 moving toward the east with a speed of 3.70 m/s collidan1 v)mh. d vok4z0u+byb1h* res headb1yvad*40ku+ ohnmb r 1v)z h.-on with a 200 g ball sitting 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 z qm,s) osqctx .-y6nv70h y/9vnd/ sz9ulc c9speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the ,s0zxvq/-c9 vsyhnt)cmlzd7u96. / 9scqony 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 collides head-on in av) 0+hxursienw b-o1g18 tqfrh8 /bx. j2fnf, perfecbx, 10h88fjv1fr2et/u h o+b f.xis-gwn)q rn tly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity vdv- aw5b ujbvn e/eds:y0y*n(xr6z9j r(yz9*, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of (x*zb60a9wz*bye:esv 5dyju (/dn -9rjr v ynthe 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 vert8v/k pzbgi9sdul2( wb z6k c(-ical direction buries itself in a 2.4-kg block of w8 w6g ib 9z pslzv2uk(bkd-(c/ood a rest directly above it. As a result, the bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 36as t y5d3pk+l;dpr/ g,c3 xnt000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the spee+d;sxc dyar 35,/ p36tt gkpnld 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 coe9,nz rl5dr jy ynwbqt;62*9rllides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collltr2drn5bn6jw q ;r ye*y99,zision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surfvq9 r j2v6)s wvqp0z-cace. 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 magnitud)vzs 2vqq vw -r6jpc90e 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 to8 b6l8to bm kr0hchk;0ol/l ;mward 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 8oltmrh0llmb0obhkc /6; 8; k fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sits at x = + 21.0o)f rmpse sm vh;*i2aqc;uba,u06 .q1 m. Where is the center of macbi1qp m,.*2uus s;rqmf 0);vh6aao ess 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-particlpo 19miv:l bo9e system is at the origin. One particle is located at (3.0 m, 0) and has 91obopvl:m9i a mass 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:kx7 uympfvi (8 ink9xj/ 40f+w 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of m/8k9k 7yfx4n0p xuvif+wmij ( ass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0tejp ua1c.0/1nu-ebrwylg6q :vs8u0 m), and (2.0 m, -2.0 m), respectively. Whc06l/q0v-1ps teub . yn8gaew1r:uu jat 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 positioned atlc3dk+ t2-act (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of theclt2c at kd+-3 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 t*5ny uk:0rxch8rh w. ihe position of the CM of a whole leg including the foot when the leg is stretched straight out. Assume the person is 1.60 m t rxw*i8.hru kch0 n:y5all.

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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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