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

1#

What is the SI unit of moment9 yo 4nj0je/gz4 douv,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 b qk5 gis/luvzuq:7dldc6m4 +2 ackward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves along a frictionless level*h5.88wvkihoryzjp-q exw(5u ;qk(w railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happei8uh( j 5ek5qvhowkz8(;- wx.yqw *rpns 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 oln k/kv5w7 ,ncff a sled while sledding on frictionless ice. What happen 7n n/k,lkwv5cs to the 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 have equal mass. They are tvmsv(v qi+)c(u/.s u -b yh9ynhrown with equal speed against a wall. The ball bob.yvquy/h(c vm9)u + sv -sn(iunces back with nearly the same speed with which it hit. The putty 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 p. How wout,7zq u:ok34:ixqubold you represent its kinetic energ t3uoq:,xo qiuz4b7 :ky in terms of these two quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic enro3c+ wlyeb 9z q 8c2cf(ds6sc2-4 xgyergy you gave it in the previous pitch, d zgr42+8 o(c es6c2ywqfcyl-cxsb39 the magnitude of its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of m;7 rrewe,sl,5 7 wihlzj ip/huas 4o37omentum.

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 moment3j; l :qxxce *u5d wd+mcssp(d1. j-jxum.

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 ver9 p,zk n h- .jyamwf6tja1f;0asus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is /41o3 uuvy mhaan accurate 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 largeb0w e8+2x uynm truck in a head-on collision. Which of the following statements concerning tx e2nm bu+y8w0he magnitude of the average collision force is correct?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

C. The small car and the truck experience the same average force.

D. It is impossible to tell since the masses and velocities are not given.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one red and the other bluakm1kdk -ouk-fq646 2 /jt+( p(diq- eotiuuve) are dropped from the same height, and rebound off the floor. ed k io-6u ukkvmui(-261(/-k tq4 daojfp+tqThe red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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

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

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m(koh ,e q ubzul6a)j86 x2crx2/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the eastaxk(xoz6,lu e8 b2q )uj2 6chr. 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 bm wtln;j5t/ccd/-8 paounce 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 movesfz ,bz6sf)nhc8x+ereqg)7 t2 to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the leftre ,xt gfnch qe)f82s+7zb6)z 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 abechc j)z;8 y+t 2.0 m/s tackles head-on an 80-kg halfback runniz + ycbjceh;)8ng
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 hk,tc s 2 kcpi4c40gp0which of the following statements hts0cgkpicc2 kp44,0 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 energ il/6q)h t)e pm;rekq0 (6tvgay conserved?

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the whw; az5k,z5xno 5k lv6qclq6p5ite cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The typeo65a,55w cl k6qpzlvxk5 nz ;q of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 m/s collides with a4hwz9sf*69k obk 7d vwk92umm1sa ) fo heavy exercise ball at rest, thd99a *)fwkmo 6 okw4s um9vk1hz 7fsb2e 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 rigs6x+v wo 2mzk-ht collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately 6wxvkz+ 2o- msafter the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on elastically with an uod3+ixkmn .t qjt kd+n )r39/identical ball at rest. What is the speed of the initially stopped ball after the collisionijt /d 3qk+xrm tn+ .o9u3dkn)?

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 am745 r8jh vqgytb2i6l ;as w3with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light 6a8imt rl;y5sah3b 7 2vg4qwjobject 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 movinug 0 3m*ghdw6zg with speed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after 6*udgm gwh3z 0the 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 collides1zg p)gj++ q 8oj5zwqi head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velo zwzj8+oqj i1q5)+g pgcity 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 movin2mo*4 b ,;idqofzg,mzg with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy objectog q*2dmof ;i,z4 zb,m 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 which of t,t 0i nq)6*of:m0 lezm -ekvwzqmlh;,he following statements is true about,mqwzmfml h*i-0 ltz vq:6 eon, 0)ke; 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 togm em f 2hdp4ea/9e/ fh/:n7cqhether. 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 ri ;j zto391k) frblvdczzm:- j2ght at 4.0 m/s. It collides in a perfectly inelastic collision with amj 1zdcf 3zlk2v) o;t:z9br-j
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 objp5-l1 rq *.3w y;siilmttnyu/ect experiences the larger maumy/q lil py.5-s ;t*3n w1itrgnitude 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 px(li(r5xc+6ey4 sj z cue 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 thc akpse6yvs .ih(wpl, k1):3*oet.cv e following statements is fals1:w.l*kkis6 ,vo3 e)tvcyaps h .c( epe?

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a false statem ex ay6t8e8;ykdcx1m4 ent?

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 wm c72: stu ub()slcj hp1gbn..ith 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 bqkvh2n5k6l l u4y2 lb8omb, which explodes before hitting the ground. Neglecting air resistan 2y kl6nlvlb8ukh 24q5ce, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level frictte/wjlwm- z -a (jzhngp /q5ae1ti2 +0ion-free road. The collision was completely inelastic and both cars quickly came to rest duringz-+5na -(jlmhgt2j eaw z1pe/q/ w t0i 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 for a aqw4fqr qsln4df2z2 w) 1w:8u3tu0 f csystem 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 355vs;s)uob (e*v)z jp7s;kfzj 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 f z1ink7xmgu8z- q qj9l)m,vk8k0e )tsouth at 20 m/s. What is the magnitude of its moment-1fmmzx7 g 0 k9iq))ju lqe8kntkz8,vum?

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 moiuj5d 9l1. yel 5nklj1mentum when it strikes the groundju5yldl1k j5le n9i1. 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 pfz;2kduf k f0zg7p1vv*q o6+lerpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momentufp*6gu d z;f02vk7fvkqz+l 1om 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, strikesh*jun:6 ip c1a+- 5gso4e jraz a wall and rebounds at 24 m/s. Wr+ ac ie:zhpu5nja61sjo-*g4hat 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 spdbki l ft756mzz 1 2 rrnoc.q.-,jxpn)eed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a dz r 2tfb5ip 7jl)1.mx6 ,norqzkc n-.speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball)e*(ec6 wk+kjy is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Asjewyc6( *k+ eksume 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 spacca j 589cs;85i 4wtba acbd1ore-walking outside 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 speed does the astronaut move toward the capsule4aa jd5wcitc 9 58bar; co1s8b?

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 z;a*8ozcee(b large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large objece;(oc 8 ze*zabt's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg mass), who sgk 5+jv.;5)gtw , ik0rkeyu dis standing still, with open arms. As you collide, while holding each other, with what speed do you both move off tog id+te)vgkju5g k0.5;kws yr, ether?

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 alonv6;yuwkskkk9r 33) 1 (uqorhbg 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 the total momentum after the collis1kwrk 6)u;33o9vb(s rh uq ykkion?

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 tkfwxu2 pcm6nmi/-afj*-w4zfy 5:pgu)88 q pmhat has a mass of 1500 kg and they stick together. What is the speed of the cars after the collision? j:mfg )2wmf/4ym-pf8qcu n58-wppkix6* z ua

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 /(xy obhjs8: u15,000 kg, is 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, initially at rest a:8/yo xb( husjnd 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 neglixy l c:65k9bbrgible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down cl:brk95bx 6ya 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 on a 100-kg log a/; 1wuetxx4u*/-a img;dgy yat the rate of 0.80 m/s (with respect to the log). With what speed does thg y 1wy/;gu-/ua;ti4x m*exdae 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. vnxj-0c- ,wnr prn. 7le-c.pk The force suddenly increases to 15 N and acts fncr0 .xjep7 -nrvwkpc -l.-n,or one more second. What impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a fj5b0*s, glml 6.0-kg object. What is the object's change of*l,s5m gjl0 fb 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 30 m/shn vof,+7iu)jj8 2tqe, collides with a brick wall and comes to rest in 0.20 s. What isf voi2)t,87 +u nehjqj the average 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 to you atkybj; i2wqtv36 ( bm0s 20 m/s. You hit the ball back along the same path, and at the same 0 bw mkvsbtq6yij3(;2 speed. If 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. 0xef loe33 djzj i 6n:fm64i6hThe speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. h0 ox3dmi 36:zi jjnf6e64lfe 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, with aoo+ful .kqh0 2 muzzle velocity of 750 m/s, at the rate of 300 rounfo q2uolk+h 0.ds 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 ofo18bzz1b+k5 *qj iostp +zv f9 a burning building in order to knock the door down. This requires a force of 1000 N. If the hose de*+bzz 1 1jo +5i8osvptfzqkb9livers 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 vr(ch-j s(8jl u* xw*thorizontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming (j*tu(-v j*clshxr 8w 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 0.12 kg, achieves a vjfn1tv7y4hd3 , 1j rzxelocity of 40 m/s after 3.0 s, when fired straight up. What avefj,jrz v 1t3 4x1yh7dnrage thrust force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 w*reqx pq; jn-pf*1vomp2 ,h6 kg, are initially at rest in outer space. They push each other apart. Wv;x,6 prh1e jfqwpq -2om*n*phat is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a sp1 ic k31/ufw3ua8yk uneed 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. Wwuc3 fk1uyina3/8 1 ukhat is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s inc-7:j0yys2 :hesfl4yj :s mju the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What s:-4s0u:lm2:ys ycyef7jj hj 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 at rest. The b m)io-v:cesm5 9:rjq bullet emerges (the bullet does not get embedded in the block) with half of its original speed. 5ev -:9icmqsb romj ):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 rz4k3s 2 yf7 inf6hg8 kn,8zhdrest, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's iz4 8hdf,72r8 gsk f63ykzhn nmass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary ball of b*bl*4v hkhq7 mass 100 g. The collision is*qbbvl4*7 h kh 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 t zu),,ate)iuk; zyo .hhe east with a speed of 3.70 m/s collides head-on with a 2at,z).k;heu,)o yuzi 00 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 +a b;jj(ftfl 8y7nz qnx /-4w,a-utxf with a 3.0 kg mass at rest. If the collision is perfectly inelastic, jn( ;w-a-xt jbn tf,la7+4 fuq8fy/xzwhat is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.0 m/s collides head-on in a1+y(bh 6k1ztsjxd : eq perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic x1hejsdt(b1kq :+yz 6energy 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 v01zhu+z f7r3dd a7fbx, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collisio17zdz7x +fduhf b0r3a n?

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 traveliwi 9 h1s6bj9e;i w0)ti puwec6ng 213 m/s in a vertical direction buries itself in a 2.4-kg block 1e; hwuwsib9 iiw e 9j6)6tc0pof wood 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 coo-o0/ufiqx :3wve izy;:v -kqllides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick toge3oiqvu-/ov:;xyk 0fi-e:zwq ther after the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides wit-y7m6- qu:/ygezpcawgy3a 7mh a 3000-kg car traveling at 60.0 km/h south. The two cars stick wm yg-67my y7p3z au-ace/g:q together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a 3nedpbl*hr; m. 8io(qlevel frictionless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. 83eqh;r.(lb pm doin* They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, isx*m 20qzvgd2 x8wv7yc 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 of2*xzvy0qw7 g 82cmxvd 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sitst:m;k(ahus (t at x = + 21.0 m. Where is the center of mass um; aht (sk(t: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 atonfc)qy/pl .oi,n+d+yk,ji : the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the q/n+,+ ,k.diljnf: iycopo)ylocation 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 (mjn8a-e syzj138a lu9 2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of m-n 8 a 18jjy3mluzeas9ass.

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 ua)8u4 m/xao9ll i tg6l v/(fj3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mas 9gtja8vuallxf(i/o )m6l4u / s 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)y0.) ib dpdutx(r0d:noxz5 7 p, and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center oi5tpx7yb(p.)0 0nd:dx d rz ouf 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 wholqabs 5qo ..r(5do g-use3djj 3e leg including the fo(au d5b3qsq 3.ojg5desr .oj- ot when the leg is stretched straight out. Assume the person is 1.60 m tall.

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A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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