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习题练习:Physics Unit7: Linear Momentum



 作者: admin发布日期: 2022-07-28 12:34   总分: 83分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 15:31  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the SI unit of moment u 3et;8lqt)lbx7jx5d um?

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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 wx )cq./cv 117ce tefcqill recoil backward because the

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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 railm.og ko 2 *i-uweydnqm*: d;(froad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car d.wo* y;e:ou*2mdi f nq(k-gm. What happens to the velocity of the car?

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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 sd (zruzi;k :8wre i-l6led while sledding on frictionless ice. What happens to the velocity of the r: -;ezu (rid 8iw6kzlsled?

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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 zhon/te c ;x47have 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 exper ocztx;4h/e7 niences the greater momentum change?

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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 withaah-jn x38yu, :k re.s a momentum p. How would you represent its k xye8 :nhrua3,ks-.jainetic energy in terms of these two quantities?

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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 thc s6(l.-dydts e kinetic energy you gave it in the previous pitch, tt-lscys 6(.d dhe magnitude of its momentum is

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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 i7+d. q e ;uua*icee,zcn terms of momentum.
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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 conservatinb+4r v5m- q9j0 ic8hlqfel a;up5j9r on of momentum.
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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 cj(r za8q(; odkg itvd1vh9x(w,-m *geurve on a Force versus time (F vs. t) graph represents

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is an accurate statr1y7 9koz q5fjement?

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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. Which of the follygcnq -wtg7*s -)euib; a:hu q/f7q)b owing statements concerning the mag7 */ew-bycs: ; qfi)g n-g) q7tuqauhbnitude of the average collision force is correct?

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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 xdirz86 u01pe the other blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position.rp8 z 01uxid6e Which ball is subjected to the greater magnitude of impulse during its collision with the floor?

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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, co 3vzgla- 9ck0lllides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to thlc-0 azkl9gv 3e east. Which object experiences the greater magnitude impulse during the collision?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects collide and bounce(z c47jamb2 ww off each other. Linear momentum

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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. Iuobhe,b*2ss2r2 5 gu;ncng /kdpn.x5 t collides head-on with a 6.0-kg object moving to the left at 2us2db/,g55gbs e cn2*xk u2po.nr;hn.0 m/s. Which statement is correct?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg * xq 7z8ti9 ecwc,hr2ihalfback qc7c *zi2r t, iwe8hx9running
3.1 m/s. Neglecting the effects due to digging in of cleats,

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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, ylma ec6wp/*eoi:v sbl57e:) then which of the following statements is true about kalyvm *:ewi / sc e)67lb:5poeinetic energy?

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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 con am1o h9mou,4nserved?

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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 ballc1q 80 z 7d. g;6chvdr g:q3x5vburhkx hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision isgu0 qb:dd kcx.qhx6 z178 rr5gch;v v3

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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 aui h h;znb 2grzt; w:70:vife2 heavy exercise ball at rest, vzf:t g2 ;huihnw0: zirb;e 27the beach ball's speed after the collision will be, approximately,

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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 rightmqyw5: tr ti+ 1*uyaj5wj *1hu 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 immediatwuyht+yw5 irmt5 1*jju:1q *aely after the collision is

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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 f6sj3g 0s+/ jx m,ulj,)doti phead-on elastically with an identical ball at rest. What is the speed of the initially stopped balj6 t3f+oisp,s 0uj /xj d),mlgl after the collision?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A very heavy object moving with speed v collides head-on with a very light objm3wdh3 ia.u yaslu.h c(+9sb8ect at rest. The collision ishs3bsl+ad uh. y 98w3acu(m.i elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A very light object moving with speed v collides head-on with a very hegzqck b1ash-b7 dboo87n9 m9 d*:i6tyavy object a9 o7 a8n1bbgb7ydo6-*qhi km 9cd :tszt rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collision is

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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 vel, gj.vp ywq 5k))pyamff j8n:+zrmx3)ocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball afteray3q5 j+fn:.y prj)8pmw,fkv) )x gzm the collision?

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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 ix. (h5rhq4g/:pzs/ w h6hjeo with velocity v collides head-on with a very light object moving with velocity -v. The collision qz6ohh e4/ ghwpri(x:/j5h. s is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?

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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 :bk 4agna.uo9 the following statements is true about kinetic energbgu.a9nk a o4:y?

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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 ej9fjxi71 0sw. Kinetic energy

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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 at 4.0 m/s. It collides in a perfectly in *y;,:uc*i/*xf hwmaemgp5pzelasthaic*xmz5* e pu ; *gp,ywf:/mic 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?

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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 objgtfi--19j;b6 hyk,orx sya60ls tbw 1 ect and sticks. Which object experiences the larger magn6riyjfylgt - b16t;o 1 0bhx- swks,9aitude of momentum change?

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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, thet5qb.1ob h/ oo white 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?

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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 o7(jmi0) r)bs4wuk9 :s onzoe/bqze3p f the following statements is false?ez9e0rs o(s/)kzbiqu4m3: p )7jbwon

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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 st)ew6v3m dpm2e atement?

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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 lmyii k/sfz 1lg(acee:xj:9/ :ong flexible rod in order to

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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, re9 wq +furg6al 347fm.k nqmu*nleases a bomb, which explodes before hitting the ground. Neglecting air resistance, tn wm*u6a 7qk+9 l4fn.mr3gfqu he center of mass of the bomb fragments, just after the explosion

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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. Thev3 r:6ry btt;z collision was completely inelastic and both cars quickly came to rest durzt; 6y3:r trbving the collision. What is true about the velocity of this system's center of mass?

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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 bd m 3m5lb*k.ix8*t8r:rx jw la system of particles.
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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 trave sgxd-i dl9p359ke2lyv6w5fc ling at 35 m/s?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1200-kg ferryboat is moving south at 20 m/s. What is the magnit0gs3z+t/, z ,j pprparude of its momen0r+rp staj,p/3 ,g zpztum?

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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 mom7m9 e d1knma6gov:e0qentum when it strikemo v g0eek qn:d7916mas the ground is

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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 eacis ,ck8(d/e dew2yk8rh other. One moves with a spcskr ydee8 ,wdki(/82 eed of 25 m/s due north and the other moves at 15 m/s due east. What is the total momentum of the system?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikes a muicju4 i* -qgbl8:wsd m86k4 wall and rebounds a8dw8*i scmu gk- 4ml4 ju:b6iqt 24 m/s. What is the change in the momentum of the ball?

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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, initiallzbwc6fw ij h0e q32l0*o 9m(fdy 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 18 m/s. What is the cha*izfjl hw0326d(m qfco 90wbenge in momentum of the ball?

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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 basebal9 3vkc/ jjf:rtl) is placed on a frozen pond. The machine fires a 0.40-kg baseball wi3j:t/cjv9 rf kth a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)

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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-walkinqk: tufjav;: 6g 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 k 6v:jf: uqa;ta speed of 14 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

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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 large object at(sokl*3tbyij61s swy2 . yj g1 rest. The small object bounces3wj(y1s2 k16ilo tj.sby gys* straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitude of the large object's momentum change?

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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 (7pc05kb,b lr gi2u0 dp40-kg mass), who is standing still, with open ar 52 i0l7c0 b,pgrukdbpms. As you collide, while holding each other, with what speed do you both move off together?

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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, straight road at a,x8 hrg:hsxw2.eujab i 1(b c* speed of 6.0 m/s. wbuh8g2. b, 1siah:r cxe j*(xIt collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum after the collision?

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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 th.pg,;tqssv +8dc u: xo m04frwat has a mass of 1500 kg and they stick together. What is the speed of the car, fwgs.sd0:mvc ;4uport8 q+xs after the collision?

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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 col:r6i6npa j)+j9di;6z.hi cp m 8ycliast along a level track atlrp)j6 8;6liih. 9 c:idpycj a imz6+n a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

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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 2m 0 2is /q3x toazyl3cp3exx9900 kg, rolls with negligible friction on a horizontal track with a speed of 109sepx/2o3lcxa9xt i3 qmz3 y0 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?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg person walks on a 100-kg log at the rate of 0.80 m/s (with respecmy)w* ovfz1 n7 -w rfek1jf)/;eszdt.t to the log). With what speed does the log m*)nwf vf1fe7k zoztem.w j)r/;s 1y- dove, with respect to the shore?

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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 obisp3yl dmp8) /e2pwl o v7.i-nject. The force suddenly increases to 15 N and acts for onelpo p p).-3iydvli7 m8e2sn/w more second. What impulse was imparted by these forces to the object?

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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. W-5) 2vn hw(dq kxohs3j) rzx:phat is the object's change ofk (oh)wsj)zqr2 -nvh:x5 dp3x velocity?

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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/s, collides with a brick wall qhnk2f1 0 ww.hand comes w. hf0 k2w1nhqto rest in 0.20 s. What is the average force the car exerts on the wall?

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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 pitcauz), t4(hf r qq z4c(8sf3ux6i*uxc xhed to you at 20 m/s. You hit the ball 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 th, )(4* 3faifzcu q(8shzxq txucx46ure magnitude of the average force the bat exerted?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.10-kg ball is dropped onto a table top. The speeds of the ball rigblcly7(m8 taw v o)dmyz4 s-:0mhh 65nht before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude mly(s64hbh5a:8 zomd- tn70 v wm)yclof the average force exerted on the ball by the table top?

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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 muzzles*8lnh0 k2tv+ 3ab* 5gefqffz velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the machine *h*ktqn0 3af+25s8vgzf efb l gun mount?

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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 orde r9;ycczv; fo8r to knock the door down. This requires a force of 1000 N. If9rcy;c; vf8o z the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

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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 horizo c:g8 4frt1ckdqu )ml3sz0*sxntal drainpipe at the rate of 120 kg per minute. It fall 1c *txqfrk4mcg8sslu0 z3d :)s 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?

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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, whel0ic.jht w:+yn fired straight up.lw+jc0y .h:ti What average thrust force does the rocket engine exert?

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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 ini0baf z c y5 mudgg.9u67.(eaggtially at rest in outer space. They push each other apar9agu 0(.dmey 7ab 5 gc6zggu.ft. What is their separation after the lighter astronaut has moved 12 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 witq6iw)k*j za8o6c qm 0rh 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 c8*jqw6) aqko0rcz6imollision?

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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 5-zz/nlzx*qtrj (s 9bmakes 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 zbj5l- xzr/qs9t* (zn after collision?

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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 wc cgx31 t0googd2(3ointo 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.d cctw3g(0 o3g2o1 xog What is the velocity of the block right after the collision?

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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 vt8ue( ka 0(o 3)mgbppan 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 tho apkvpe(gb mu38( t)0e collision? (Assume the neutron's mass equals the proton's mass.)

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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 ol6o z4 kwyps6y3viw jn3q*(w)f mass 100 g. The collision is elastic. What is the speed of each ball iv3(yk63zwi lp6wqj4ny*o) s wmmediately after the collision?

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69#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A ball of mass 400 g moving toward the east with a speed of 3.70 m/s colsydfi,g ,s( .mlides head-oims,.dg ys,f(n 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?
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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. Ilj,ikwl:c r.)t collides head-on with a 3.0 kg mass at rest. If the collisi cr .lw,kj:)lion is perfectly inelastic, what is the speed of the masses after the collision?

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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 collht 3.co2vt9 zfides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collisioh ov2tz3f9tc .n?

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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 z:a q183 va kgzg7-fa d1vzpd)a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. What fraction o1dav1 g8zqvzzf g): kad7a p-3f the initial kinetic energy is lost in this collision?

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73#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A 15-g bullet traveling 213 m/s in a vertivndnv25r :* w-4ckd vmcal direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combinakcv-vn 5 *4nmd: drv2wtion 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 east collides with a 3000-kwyxf0gbp 35oo ;3*jg jg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the speed of the cars aftery 3 0x*5jgfg op3wbjo; collision?


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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 trav1lhmn+) :bn pyeling at 60.0 km/h south. The two :mh1bn+y l)pncars stick together after the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?


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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. Object A moves east with a7iiwsby )kz z1my(1-5 8twrha mosyrai- ) tz7mhki1(w5bz 8wy1mentum 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 after the collision?

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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 velocit9,4bx2ypc4 tn2vza; jlth g;4fyq5 dly of 4.0 m/ b;t2245lpd9l ,x jnz4y4a ch vf;gqyts. 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 third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg mass sits at the origin, and a 10.0-kg mass sits at x = bfo3y5 ;5xqsvh+ )r+p4niq fp+ 21.0 m. Where is the center of mass on the x-axip+sof+npqv4f bq) hr;i y 53x5s?

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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 qg*c20ha s/+helvr k3two-particle system is at the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mar+lcv0hg qshe *2/3k ass of 3.0 kg?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three masses are positione3)(l7r9lld z,a9p*q hzu dxd od as follows: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinad u9zzql,px)o (dd l739h*lrates of the center of mass.

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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,. 3 thh muj:alac9+u:w are located at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. :cu 9ha . :h+tlumjw3a What is the location of the center of mass of the system?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is positioned at ( e je:*.-mf67jg8 pb;usklhjn12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of thn*j 7.6j8 mgjeu fb-sk plh;:ee system of three masses being located at the origin, (0, 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 positionkwwa8l0tpt5f qw ;d,/ of the CM of a whole leg including the foot when the leg is stretched straight out. Assume the person is 1.60 df8t/kpw05, wl tawq; m tall.


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