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

1#

What is the SI unit of l)2 e5 l(j p.aay3n0ckesavv1momentum?

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, sjj7 z iq )d67)wwg24qmmhk*mthe 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 n:*gx xnn/gk; a frictionless level railroad track at constant speed. The car is open on top. /: nk*n; xngxg 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 of xckpbaz ar:9+:zt.*8 3z/ f8rzhoog kf a sled while sledding on frictionless ice. What happens to t+k kz9z*h:3g/rzo fp.atobx r a8c:8z 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 hav y2/a ,xtv- a oha dqqanu)l3s )btg+.h3ud8a-e 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 puyq3 3)tq+asouata-a ) 2 -l8.nbvd/h gxduha,tty sticks 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 momentum 0h ,+0tdnggvk)p chl). ssjc :p. How would you represent its kinetic energy in terms of these ttncld)k+c )s .0g, :0hpvh jgswo 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 i 8ztv igd +n38g oew;dc-a,yb22 8folqt in the previous pitch, the magnitude of its momentum is2 o nlgozfdta+-gy8, w8c8v3b;iqd 2e

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 mom/ekgi vh6w4m2 entum.

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 momentu4 p7hngd;j8z j6;m /4gzd0xx9uhsdpj m.

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 represeo*-yx ta0rz*gnts

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 accuratz7-l9z cfm dc3(xr4fae statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collision 5g/5ncyjlt( )r,6ft9kqrd xb . Which of the following staj5trf,t65rdn9 y)x /klc qbg (tements concerning 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 az,7j m8r)fz /cxgon*8 l2pfa snd the other blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjec,fmaol8 8z/ 2x*fscpzn7 g)rj ted 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 with e9yi*ur 2fkgbj /k0rw2b4wg5 a stationary bowling ba*2u/gy kwew fi 9b b0r4k2j5grll. The Ping-Pong ball bounces 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 rr y/5cz(tya 2and bounce 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 to9us 7i3pf joo4 the right at 4.0 m/s. It collides head-on with a 6.0-kg object m7f4s o j3puoi9oving 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 moving6tei* kb+an )i at 2.0 m/s tackles head-on an 80-kg halfback runninge+)tbi i *nak6
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

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

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, then which of t2 a14r k cs9;:sj3zvdqm0qeihbx.g b)he following statements is true about kinekb3 b 9c:z0s)m.;x4shve q1j argi2 dqtic 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 conjyih9, 3zam 6eb:xye4 served?

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, whnvd4 +x/h s7: ;f6ipn(jxnlj qff9*kdile the #5 ball movdx9 fsvj6 nn; :pldnxj* if(/h4k+q7fes away with 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 n h iejm8jgcdapx4:l6 e*s556u x4dax+-1esg with a speed of 6.0 m/s collides with a heavy exercise ball at rest, t 4a8 mxd6uge65j4x-:h+ds5pcneajxg* lesi 1he 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 collid kc m5rgq9w0 ;dui;7d e:me.ttes in a head-on collision with a stationary bowling ball in a friction-free environment. If thki;9g wdc t 0e :u5me;m7rdqt.e 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 m/s collideb,y 47qvrqm++fr u)xsi g 1ck:s head-on elastically with an identical ball atgu )1q ,+rm y7skb:xrvifcq+4 rest. What is the speed of the initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with spe6rd2urvb (f-k ed v collides head-on with a very light object at rest. The collision is elastic, and there (fur2-6 bdrk vis no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v coll1if .vigv9 g-pc h00ddides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. 0gi0f. p9hivvc-1ddg 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 collido4 gluv:2g4(ax : ytlces 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 oug( c xvyg 4::tl42laball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collides head-on with - led76;syi+*9: 7kxp*/jayfme hsyi;qq obra very light object moving with velocity -v. The collision is elastic, 6 *q*qj9fh7 :/doxye;ysbyesp - 7;kimril +aand 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, then wp7,ps4 2ktsuly z;:xohich of the followingy4: 2 p,plko7xu ;zsst statements 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) j9vn/x 10vkn bnhun2 :iekt-. 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 atz8w4,m v 1ginm .0cptg 4.0 m/s. It collides in a perfectly inelastic collisioiwzp 1gcnmg8,tm.0v4n 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 experl nrn,)pu)6xg iences the larger magnitude of momentum ch)l,xpu 6g rnn)ange?

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 dkippx(6a.3-(d azh hcue ball hits the #9 ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of th,uorct+u s-d( e following statements is falsc dou+,-( rtuse?

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 akg r0zh5w sv pes97r34*q7bmn 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 witnkloj2-l*oc 0h a long flexible rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally, releases a bomb, which explodes bpn*p11 vg,c ieyn,tbj bi2h 4;efore hitting the ground. Neglecting air resistance, the center of mass,gty e4h;pv2 1cpibn1j ibn* , 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 collisu,ie i-y*4-ibn:wd epf jt( l+oy2x,rion was completely inelastic and both cars quickly came to rest during the col*no-exd+t y-irj: 2piublyf4w,e ( ,ilision. 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 fyk m8a,fxgbgpzg . i5(j*k. y: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 traveling at vq2up7:l rt 4a ytk qycw6m+))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 movid jq4a2 j3zvj/ng south at 20 m/s. What is the magnitude of its momzvj q24ja/3jd entum?

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 w3ap9 jk sq+o+hjs8zhl)6o k) (n1u mwmhen it strikes the ground p8slw(3 jzsuoh9)+1ko )q6ma j nhm+kis

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 carnuyf89)g 6g gcs are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/gun 6f8gc9)gys 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,k6- u+ 8* -ao /svt6aqykqkxyd strikes a wall and rebounds at 24 m/s. dqy t/a+yk*v6k o6-akx u8s-q 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, initi3kxgekq xq,(h0 ;pf f2ally moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 1qkek, g3fx 2qh;(f 0px8 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 bas5ju wq; y)z0jfeball) is placed on a frozen pond. The machine fires a 0.40-kg qjj) 5;uf0yzw baseball with a speed of 35 m/s in the horizontal direction. What is 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 outsidtw tp l212g9o7iqmxi 1kbz*3we the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speedmz w2qxbl 72tot1 ik39*w pig1 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 largs.om i7);kv7b yr 8g9x mhqgu0e object at rest. The small object bounces stob7mv gg0x;kr7sqyu 8i9h.)mraight 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 +zzjwkto )+sr h81 w2k78 yxshyour friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each othzz7o88jwsrtk )2 h1 ykxw+ s+her, 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 kjg i9a-;i,sxi 8be*v mg moves to the 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. What is thii xemib-jvag8; 9, s*e total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear of a stopped car that hasibg*+k,ek *ih 7nc :ac a mass of 1500 kg and th*7g ike: n+hbk a,cic*ey stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, +df1b.wva*l z4eqx 6 uis allowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initi1bqzwv+ dl *6x4faue.ally 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, r( 6 jv8vswbc8gjugxot8s ;m;e.ns9h 1olls with negligible friction on a horizontal track with a spee.sv wgt(ss;88;on 9 x8bvj gum6h1cjed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks s)h- -ucj3ylq (vs :ipnhp8w) on a 100-kg log at the rate of 0.80 m/s (with respect to the log). With what speed is -vlp)(nuw-jqyh : 3)8cphsdoes the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object.y,+cr sc:gdqf)dq6b ; The force suddenly increases to 15 N and acts for one more second. Wcdqf:d, s;g+) qbr y6chat 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-kg object. What is the obj +onv2 jtuzb/1yl)6u fect's change of ly26u1z) bu t /+nvjofvelocity?

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 tsfbtg r* .xw0(bh3ts*he right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the carb 0.xss* ftrh*bg3wt( 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 bal/fk2nwcnyr j/ 0hb91nl back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnitude c2/0kb f9hy wj nn1nr/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 t *tszp8f0zqm .able top. The speeds of the ball right before and right after hitting the table tz qft 0m.*zps8op 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 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, witqmn 8d :rga z lm,zu7) n)bnp95f7t0kvh a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exm7lgbtzmafu0 :nz7p)8r9), q nv 5dkn erted 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 t4c m. sfy-+pcqhe door of a burning building in order to knock the door down. This requires a force of 1000 N. f4- mcq.scy+p 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 120j7;hb3 z.tqfypp7n:s3x j( wa kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does jhp fn7 qas3ywz(.bt3:;7jxp 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 after 3.0 s, wm bn+s pv4capu0;br jwd1728x hen fired straight up. What average thr8 ;db sncp+a7 mu2 b41v0rwpjxust 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, arvlo t61bbq+u(b m+l:e e initially at rest in outer space. They push each other apart. bo+q bm1 :ell+t( buv6 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 the6 l;rvie5n 2*h je6 njtr9o:zruit1i: right with a speed of 2.0 m/s. 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 the jziiu* tn :nrj6 16v2t5riho:erl9 e;collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x direction makes frx a(3.39m4uhij,l,c m f kkna head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.10-kg object afteuimfnfka hjrl,4 3(cxm, k.9 3r 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 fi(ivi .2ybj4r-bh 7uaared into a 1.00-kg block 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. uyaaib- j7b(4v2hri 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 8.r;y2kq63v jwx3y n isee.yg, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collisiov .ywjis .e32xq3ry 86yng;ek n is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary4v*m6vfnacc,is7p x hyl;n3y t )o94v ball of mass 100 g. The collision is elastic. What i)hav46nnl 9voys4ptxcy 37c *v,; ifms 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 speecgx .ei:;l;is/t v8nyd of 3.70 m/s collides head-on with a 2vn/.:;tslie8ygx ; ic00 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 speed of 5.0 m/s. It collides head-on with a 3cfp qifg64:f ..0 kg mass at rest. If the collision is perfectly inelastic, wh q. f6cp4ifgf:at 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 /h st:yfh6 *rq9 j0zmzeast at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much rh9 :0 h*z zmjsf6tyq/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, travelin*2s q2ijaw 69whhb,yf g with a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock togethjfw qi9a2*h6hs ,w b2yer 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(sntc(j4,k lm a vertical direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moves ver ,(tsjclknm4 (tically 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 3000-kg car travelythtm,+z yr p*4d mx.3ing at 60.0 km/h south. The two cars stick together after the collision. (S*+ pmzx.t,tr4dmy h y3ee Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-kg car traveliv jijbvz0vj)k5)x w*, ng at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the di k v0, xwv)bz)5jj*jvirection 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 suf5zl;t+b wvvy fh*x,.rface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly ineyvl,;* +hx f5v.twzbflastic collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, pmvlgkp)pcv6 9: t04gq m2 v6)dzv7lois moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a p p: p )2vlgdtm96 v m4v7zc)qlko6g0vthird 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-k98ywnw/ 3lfn7vb te0 xg mass sits at x = + 21.0 m. Where is the center o b3nl9wwvx87tnfye /0f 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 orir0vkmr8 fmaxyyc48u;8 ,p2 qa gin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3.ka8rmr0 4 v;qp 82ymc,a f8uxy0 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 follu fyy: .f) ;5hc3opns/rhd)p aows: 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 massf)doc;u .:a hp5f/)yp rny hs3.

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, 1x v.k8a6za)mapsby-gj(c8 , x.0 m), and (2.0 m, -2.0 m), respectively. Whaa8vc,ga x m68jx.sk a)(-zb ypt 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 1.0u 1vasf/u*t99zgx- f s-kg mass is positioned at (12, 0). What are the coordinates of a 4.fug s9z*f1x-/s a v9tu0-kg mass which will result in the center of mass of the system of three masses being located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a whole l6 xdpb m::jdahty4pzl/ . h4 h;2uzvo1eg including the foot when the legm oya:uvh4 p.tx hz ;p/djh4d62:zbl1 is stretched straight out. Assume 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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