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

1#

What is the SI unit of moment4dupkr). sej/9q2.xu ew hwe /um?

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 becdl*s lrio. 09gause 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 rh)7 wpa:unv1d oc7l,z ailroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What hap h7,)culvzon 1pdw7:a pens 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 frictionless ice. Wha9 rl3 6h8wzgc3dd+b piou r;m)t happens to t ridl38 zw36gbr;opcdh+mu 9) he velocity 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 hj k0bv88zxqq4ave 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 sticks to the wall. Which objects experiek048z vb8xjq qnces 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 momentum p. How wo o7*y5w030rn(hhaxdgv r gxj)6xb3dwuld you represent its kinetic energy in terms *5 hga6xo0 dx 70wrr)xv3wn dhj (gb3yof 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 it in tvbm naq4mrkyg62 3((the previous pitch, the magnitude of itskrn2vy6 3mtq a( mbg4( 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 momentb; .ej;s/ cpwywahga/ i0g4r-um.

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 o q425+bwmjdw;ljm7s6 id mog-f momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t) grz/buzc )kb1-njm*) omaph 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 ac8e;*;fn- mq0wwpuzzt curate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collisgyi-/ e 7fctc+ dap:+tion. Which of the following statements concerning the magnitude of the average col-/g+yf epa:dcci+t t7lision 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 blujdnvfw1vsc0ocj7o 1d ls j6 p +*87k/ge) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to th6c8csj *p1 wlod+d fovsgn17/v7j 0 kje 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 mn:ylza75 ce2bv;;y ,kxs g+jb/s, collides with a stationary bowling ball. The Ping-Pong ball n2;s+7 g5bzbc: yke ;avlj,x ybounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

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

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and boul+p; y s/f wo2+n/czawnce 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 collides head-on with ako i kpn-7:,cw 6.0-kg object movikwcn o,-7: kipng to the left at 2.0 m/s. Which statement is correct?

A. The total momentum both before and after the collision is 24 kgm/s.

B. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

C. The total momentum both before and after the collision is zero.

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles hpls,uoi ,qq p cy*6k1.q 31kyiead-on an 80-kg halfback y31s.p ii q6q,,o kck pq*ylu1running
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 ismc1ssug26ul/3 urn7bh8 o ft4 conserved, then which of the following statements is true8t6f7 osbmsn urgclh1u/4u32 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 conserved?yted /0au1zhv 5kdmt *2z +)nd

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 bth./- db/7fmwtu; hlo+5/rfeg k pi(kall and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type ; /e tmkt5.plb/f /io(7 hd+hrug fw-kof 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 wit0t.,pzn 9vc wtpz gv25h a speed of 6.0 m/s collides with a heavy exercise ball 2zzw0vppcg v5 tn,9 .tat 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 3qs9lq ku5n /4ft0 os)n.0 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 elast/f snqq4 uslo)9kn5 t0ic, 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 j n:r.qbt2 rcnif*/s 00yrgq5of 5.0 m/s collides head-on elastically with an identical ball at rest. What is the spee5fc qbr*sq/ryn t.grj:0ni20 d of the initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object movif+md swryvol u /93)f,ng with speed v collides head-on with a very light object at rest. The collision is elastic, and there is no fryff,w+duo9 )rv/mls3iction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v collides head- 0(-;2deqb-z eobs vewon with a very heavy object at rest, in a frictionless environment. The collision is almost perfectlewbeeb-d ;o2qsz-v0( y 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 bal1 x-lpfl) o0qil of equal mass moving with a velocity of -2.0 m/s-qpxf10ill) o . 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 velocity v collidesv,bwv u.w8d di mh5*b/f9e7xs head-on with a very light object moving with velocity -v. The collision is elastic, and the57/ wd 8dmb9ei hwx*fv,.usbv re 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 k*x: u)omj(mvq* d6av conserved, then which of the following stat6ukvxm*m v: o)da(qj*ements 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 stickqdio h6-0:k9 :zxmaqi 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 a t) c +7gbbw/z wjtu22r*,bxsmt 4.0 m/s. It collides in a perfectly inelastib,w/ucgsb7z2m t j*b r)+xw 2tc 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. Whi/ dw3xl92xf)ouge 2dnch object experiences the larger magnx ug23 d2ex9)fl wdo/nitude 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 1m av3tcb53hz+ jf*a 7hy 3ddqhits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following sb6a5y hrk+rzagd580statements is false? 50agzadksr +5y6bh8r

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,( wrhf2vg, am 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 fl ut.4cgm8 ,5a/ pkwyzsexible 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, rx)g 3o:1 jagvi9j; wcdeleases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fraj vx1gojic 3dgw)9 :;agments, 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 collin;2r kbtu )bu(sion was completely inelastic and both cars quickly came to rest during the collisurk) n2( bbu;tion. 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 for a system of parce(t:bfpt1 84 jhjh. xticles.

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 trucf*) l6/8llnsrk-r j jyk 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. What igyrxwiy82ul+: b4c: t s the magnitude of its momentuw8:gi+ y rlc b:xut42ym?

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 hemp2i6q 87zec i9bi,hq ight of 12 m. Its momentum when it strikesih 8zqqei6 2,9 pb7mci 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-kg cars are moving perpendicular to each other. +/1x*l *iy4,dcs:h bh cwi lsfOne moves with a speed of 25 m/sb,ld l ih s4s yfcw:+ic*xh*/1 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 horiz 9s( s+l;ujcxoontally at 30 m/s, strikes a wall and rebound os(+ul;sxc9 js 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 moving at a speed oap;mc)w pv/pa0 splt (sfn7dd1. e1r+)n8oxg f 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the nn orpppmt eas 7vwp)s /1+d)81la. c0 x(g;fdchange 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 ba 7aeh(h 0mma/qseball) 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 spmehh q (7a0m/aeed of the pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking outside the space capsule ang rx1c cs42;u+arfgbh;q 9mmdvf 21; sd is stationary when the tether line breaks. As a means of returning to thefxadqc;rfvbh1sg42m +mu 2 1;gr;9s c 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 lctcom7 iqxyl9b p: )t48c.sv2(m 3gom5ohqw1 arge object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitudchtmp 125oq :mo 8l 37yg4x9bsm( oc .)qicvwte 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 mddk i -d(a4c w9fn9/qiass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you (i/-d i 4 k9nd9dafwcqboth 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 right along a level, straightn 2;(,ll hp3rv;sybc x road at a speed of 6.0 m/s. It collides directly with a l3b c;,vx(2 rhl;y psnstopped 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 runuifq64 ;xjbo: s 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 the collis:ixqoj4 uf6 ;bion?

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 cm9-gj 7vwqkh.3z ncx; oast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakhc-7;.nm x3j q gzkw9ves 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 imee3 n v 8gf6/; cucb9a+t*fia horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How f*b6;/gcfe9 3ievt8nmaci+ ufast 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 60 qvy:drxx5 csz28efv 4/u econ a 100-kg log at the rate of 0.80 m/s (with respect to the log). With what speed does the log move, withd20 45vueey8c6zcvsx :rq/ xf respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force suddenly increases to* ::8r cb(khdo.oey4j9 5+ipndzfj (pz o- wpw 15 N and acts for one more second. What impulse was impartppic (- w+z 8oopyjk ej.9 hd:4w f5dzn(bo:r*ed 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 object. What is yf r9f4dten: (mos57gthe object'ymg5rfof t7 :n( d49ess change of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 3wzar e8csstzk.by56a (7d n7 +s:3p fc0 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the aeaws3:k(p7s7c+d.nsafy6 cb 8z zt 5rverage force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched j/+iwb6wg:q56deogt i ,ugc1to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If i5g:je,d oqw66 t+giwcugb 1 /the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. zxxsy q912o* 2t* gz)x oy5nqx 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 the ball and the *gx)xt5qy n x2z9o2yx*1sz oqtable 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 bullets, with a muzzl-9k) 1 xaaco sw nwa7-.a1gb(ph2i ilje velocity of 750 m/s, atj 97wai .acplb(2)xgk ioh -a -nsa11w the rate 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+0k1dyu3 ex u za0jye oclc8/9 order to knock 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, ass0 yc08e uxa1 j +ku9zo3cl/dyeuming 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 1jid.3q:s 0l:i sd/hpm20 kg per minute. It falls 3.20 m tdmii s 3.:/lhds0 j:pqo the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12hn8 t2km 8c )f/mn)c zap/x2ng kg, achieves a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrust forcen 2x2p 8cga)nz8fh/m)ck nmt/ does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initially at r 6e /qxzg9 tstxq.3e1aq ,-7s ll)bgvoest in outer space. They push each other apart. What is their separation after the lighter astronaut t16lb/, sz)qg g.lq 9 xe3qov xs-e7athas 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( ralgj0jn,5xom7 4yy to the right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving tojm j0yoryg,a54 (7nlx 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 0.2ju6naa ;. /l7z cn8z uxj+-hcc0 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object after collisua/-7lxj.n hz c;cjzu6n8a +c ion?

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 fi - cptg(j5mio6lgo5nh)3, kiared into a 1.00-kg block at rest. The bullet emerges (thj6k,5oai( tgmlh-onc3i g5p )e 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 head-on by an alpha-particle (whichk kv 6mopk7.4x 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 pro6.7vkk pm k4oxton'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 hsydos+1k 8-c l.f -ugx)k d 9:uqah0gcollides head-on with a stationary ball of mass 100 g. The collis1-og 8kd)u uka0.xdss9+- hlgychf:qion 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 hl5qhk; ;pltby k0a6 0a speed of 3.70 m/s collides head-on qpkh6 layk; 5lht0 0b;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 withmi(w+wk 9luna,(+ d ur a speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfec,(wlma r(w9+uu n+diktly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a8mz,0 vn5s iqr speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kin 8qsriz05vm, netic 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 wmmjcgun6wdyd: /2wolg vt)h q*(p)768 u0uyp ith a velocity v, strikes a parked station wagon, who's mass is 2m.c8 d6y )ptv2 l 0:7ugwompu(hd) /m*gywn jq6u The bumpers lock 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 u12od/gqne,qt 2j/vp j: ;xco213 m/s in a vertical direction buries itself in a 2.4-kg block of wood a restnq/, p1jg2ojtcdu v xo2/;:qe 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?

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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 e,m-h i2eddz07le h(yf ast 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.) Wh0,lh yz7d 2hef (-emidat 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*u0zkm5gdhr1 c j;)f u east collides with a 3000-kg car traveling at 60.0 km/h soc 1ud;hf5rz0 j g*um)kuth. The two cars stick together after the collision. (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 surface.j4 kcymw,h1+ i 6zp5lq 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 magnitude of their combined momentum aftey4 k l c1mw6,+qj5pzihr 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 with a velocity of 4.0w1tp:djkw bxo67 vu 77-wjf d; 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 thkf7x1p:o6-7uj wj 7b d;vdww tird 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-k r03 gywhwm71l dj8zn)g mass sits at x = + 21.0 m. Where is the centwz7jnm 10yg)3wlrd 8her 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 orig+. mf,9ltp3n1sawgctzm27a q o*8 zrkin. One particle is located at (3.0 m, 0) and has af1t2gzq9 pc aw7ozt3*m,namr.ls8k + 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: 2.0 kg at (0, 0), 2.0 kg at (+xb2wq0l +sy oh4 .uzcuev3,c2.0, 0), anvue+.,23 40 lyo cswqx+ uhzcbd 4.0 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 kg, 2.0 kg, ai -vq1g01iwp8cf/-;n47 ri zal ogkax nd 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 locazq;7i8/- w gi0xgo-c1liaa1nk rvp4ftion 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-(njtxs(hf*b n9k:wl 9m 4ishv+ (ms:dkg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses( xv4mm sjf+ kbt(hs( ihn9d:nwl* 9s: 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 CM of a whkfkl+u)/e+hsg hsfqn (ziue 3yt8( (9ole leg including the foot when the leg is stretched straight out. Assum /etynk3h()+ uus+ fkqz 9lh s(i(8gefe the person is 1.60 m tall.

本题所包含的其它图片:

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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