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

1#

What is the SI unit of momentum? gz.pj fi:7-okw.5xsa

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 e41bo5es0s1ipr- rehce h +2qcannonball, the 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 a frictionless level railroad track at constant speer icwf0a10pp 5d. The car is open on top. Aiw0 0pp 5afc1r 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 off a 1e ua jpb;.kl:sled while sledding on frictionless ice. What happek l:b ue;.p1jans 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 th6hwx/+jmb r)cc, o/f swwgf .:xgod,.rown with equal speed against a wall. The bal) m6w/cf xjh.bsxgfw+w/:,.rd, co ogl bounces 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 momentuepwo a)imi,;izi4 2v 3m p. How would you represent its kinetic energy in terms of these two quantit,iv2w)amipi z3;eo4iies?

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 gaveweu2 s:**n duvebbt3gs5 74ez it in the previous pitch, the magnitude of i*ue2 n5wvsz7 gs bde3e*: bu4tts 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 u/a0 .e bvq spvy2pcf gb(ow1-,f2zf; law in terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of momentu7wlhswr*wuz gbc *6nb/2pqh (g 3-l)k 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 2xb6eteh+md/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 followitpyqs,4p)fyz2)8u bcch, d;i ng is an 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 large t,b0kh3 qf4)vl fdc4r vruck in a head-on collision. Which of the following statements concerning the magnitude of the averbq4 0,vlkvdh cf3f)r4 age 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 blue) are dropp6f+6t2ovffc,phn +y ted from the same height, and reboun66o+c,f+ 2 p vftthfnyd off the floor. The 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/s, colli a3 ;kvrta(i0tdes with a stationary bowling ball. The Ping-Pong ba3k;t aira0(tv ll 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 and bo:a h)9aj**weshft) bvunce off each other. Linear momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 8bt4vm bq6j3k4.0 m/s. It collides head-on with a 6.0-kg object moving to the lefv6k t4mbb3j8q t at 2.0 m/s. Which statement is correct?

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

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

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

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg halfbacfn0+eyn5p:k0nmss;r k runninmp n : 0rf;5k+eynss0ng
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, the ndn97ddjl qt+:s)h p,n which of the following statements is true about kinetic 9+ dtqj :d ns)n7pl,dhenergy?

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 conse u.r:b6s y vklud(q9u5rved?

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, while t o1 l9wo,2+pcpw/q qmzhe #5 ball moves away with the same velocity as the cue ball had originally. The type of collision mqpc9zw,/q+l1o2wp o 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 baljt86zjc ve vu/z0o4t(l rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, atj0/u (e8zvzj4v6o tc pproximately,

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 f45 d) 4-lef(ldmmz 8tt 6;fzep3utuf3.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the spe4f( -eftu35mz)u m68ttzl;fl pddf4e ed 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 spee kp6/(ih/xb f0dmqq(k3qqek2d of 5.0 m/s collides head-on elastically with an identical ball at rest. What is t x3q( q2(//kk dqmfih 0kqep6bhe 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 speed v collides head-on wie0vy8cj0l*)t et4*l 4 ukmg wzth a very light object at rest. 4wk0l8 lectvyt gu j*z0 em)*4 The collision is elastic, and 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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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object movilrclpz1i4.4w f+ien*ng with speed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly +41rni.lf w4lz icp*eelastic. 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 velocit90(,o ws cavuey of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. Whatv (s,e0 cw9uoa is the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velo* . pk u/5qgvrtt0xg i jg*q0q+:qc4pbcity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and th+qt5g.p*qvg c4rpx0tu* ijq 0 /k:qgbere 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 mm(h s(a jvh4) u zq4ny:z5)kigomentum is conserved, then which of the following statements is true about k4q) zayin(s:kz(mh j5)vgh 4uinetic 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 andn b tf2p.:gcfdyv70,psgyy.*v : 6ggz stick together. Kinetic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collides inph4k*oasx i( 6 a perfectly inelastic collioa 4*hk6s(pxision 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 collidekx gw5mhs:0k1s with a large object and sticks. Which object experiences the larger magnitude of momentuh5k1w mxg:k0sm change?

A. the large object

B. the small object

C. Both objects experience the same magnitude of momentum change.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball andnycmrn8ng+ 2 7 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 m2vuvq rd 0-lc.asses, M and m. Which of the following statements is fals0c ruvv .q2l-de?

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 flo3cet3:5vt5jd , b lis a false statement?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk with a long flejh9t6wz jpz ykw i2r/2p;5. vpxible 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 exploni(w,l22o:t qu- ndexf m7ef*des before hitting the ground. Neglecting air resistance, the ced xen :efi wt*2,uoqf(-n72mlnter 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 friction-free road. The collision wasxhewe,9r npl0p7 7dt l6*oqv9 completely inelastic and both cars quickly came to rest during the col9phd v7p eerq70ltx6n*lo,w9 lision. 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 + w-npl1v :. oqga1/dv:sk zzxsystem 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 35 el3e6lrx.m2nld4h m*, 5 on25ppru w 07upshum/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 soupplmn7a:g - tersf 0vos9+96 nth at 20 m/s. What is the magnitude of its momen9g s:vnrs -tp 7lp0f+9en6o matum?

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 heiy ost3;,,:hxxr z2mkgght of 12 m. Its momentum when it strikes the gx,,hgmxrkst:z o2y 3;round 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 movin(n6 (mj 2jol(b yeww26awa 0h1hiqo no.f 2wp4g perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 15 m/s due east 1hwn(l qmj4 e6i2 f0ph(n26ay.o(jwoob2 aww. 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 mng en1.-eh aw zq snx2wv1(28m/s, strikes a wall and rebounds at 24 mn exn 2 1v2.g1w-msehwazq n8(/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12cvr/:gud4g* qb0o f1iqvs 5y9 m/s, is struck by a racket causing it to rebo*sdq5r vvf /cui 4gg1yb09q :ound in the opposite direction at a 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) is playlb5iu zjhfu1 1ju-t-m (fq hez*+9x6ced on a frozen pond. The machine firesxj9q 6 zuyz-ht5f 1fimuul1* bj +e-(h 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? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking outside the space capsule and is sta0e:8w4kaki ti tionary whtai0k4 e8:kiw en 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 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 large object noe(wrquug9nx3:t .) ctss4: e- nc t6at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. e:3:t gstu4-nxo)eswqu 6ctr (9cn.n 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 yo96 cksd43bcjy/t) jxjur friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both mox)/cstc jkjbjd43 96y ve off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the right along a level, straight h.c 4/gi le*nlia 7y +cmi3bi;road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the to;ge+ l4ilm/cb7nci i3*i.h y atal 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 rearcd 8kqn17janc9 e*a(l of a stopped car that has a mass of 1500 kg and they stick togcae*q d(98jk1cnlna 7 ether. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a level taqftj8 r1p , t2ecxcl;+/ r*/i *ybbmerack at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initiallyxc* et/lq;jb fb i8*p/a2+ r1c,temyr at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls with negligible friction +n m ,nfxr;7v l2-nwb0vum2 ybon a horizontal track with a speed of 10 m/s. A 70-kg stunt man ym2fv w l 7,m+0u nnbrvx;nb-2drops 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 on a 100-kg log at the rate of 0.80 j,t,lfozbr, zl2n3;e 5fupkur-h7 m2m/s (with respect to the log) urkb-rm2n;fu jt3ep,zhz,of7l5l 2 ,. With what speed does the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force suddenly increases to v3 :49dpzrcvdz6ma7 3 yrgsk; +q y;jr15 N and acts for one more second. What impulse was imparted by yvzcja+;v3mk9d3 rq6d 7r; s g pz4yr: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 fo+qbmowqf;l-+i t +id ;r 2.0 s on a 6.0-kg object. What is the object's chb;l qiq;w-m++f+ot idange of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at dcda3c cmp fu (l x-,7)fyia+,30 m/s, collides with a brick wall and comes to d 3apc7 (c+yx, idm,)cfl-fau rest in 0.20 s. What is 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 at 20 m/s. You hit the ball back along tsoob*1 smk - aubd(r)(* kc*hohe same path, and at the same speed. If the bat was in contact with thh- sraok(o*obs* ucb(dkm1 *)e 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. The speeds of the ball right1o uw; ufg;m;d before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the t w;u1du;fm; goable 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, fire :t2w;0tg2db :hp5)d-7r vzwq vuwizys 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is r- tqww7i wh b05:dz2u)td zy;v:pgv2the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building in order /nelynxmi)o3 b/a .-:cq( i mwto knock the door down. This requires a force of 1000 N. wy m-.ne 3c(/xq/anmio)lb:i 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 vf/ r++66huz,wq rlio at the rate of 120 kg per minute. It falls 3.20 m h/+6 fvwqo urilzr+, 6to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg,ve fi0+4oct;, yr vzk- achieves a velocity of 40 m/s after 3.0 s, when fired straight up. W4o,vc iy 0+; vzer-ftkhat average 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 kg, are initially at rest in outer vu se4 q:k+kqzb0o,b*space. They push eack,:qk+4vb0 eb*z sqouh other apart. 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 the right with a y :dgj+qii ;x xfr:+t4speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left atj+fx i:ix +dq ;r:yg4t 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a v/o/*ml 7 eym-i5fu+ vl;arspuelocity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the final velocity of the 0.s5/7p *;eal/ulufor+ imm-vy10-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 3beto/jt x ;/5s00 m/s is fired 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 bloc5; jb tse/otx/k right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by l9 .e8zi, arnbb52zn(y3 m zqdan alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely e dz.5r bei nab8 9(mn32lyzq,zlastic, 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 stationary ball 6rzjmm l.qns66u6a;vnbb)s 7 of mass 100 g. The collision is elastic. What is the speed of each ball immediately after t67;6 bnu nqsja)sb .l6mzrvm6 he 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 eg-li 4zjgn5ez p40;jhbtk.85tve d/ toward the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfec;ze454-v/gj.etbh jt8 0ipln5k z edgtly 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 ofc4 chci l(alv3y s7,csuj7.9m 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. Ic c(u4slc 77l,y 9a mijsv.3chf the collision is perfectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to th d-.f2-gl* 8muejivx ve east at a speed of 4.0 m/s collides head-on in a perfectly inelastic collisii-j -xev2u v.md8lfg*on with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a nssw*7 mu k:l:velocity v, 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 kim:*w7:lssn k unetic 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 traveling7n7;/ rsudl7 6gh71fpzjoih b 213 m/s in a vertical direction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combinhgjh77u7 7 o zbds/1;ri 6flnpation 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 traveli/9qcxfw w;l t/3xvzg1 ng at 90.0 km/h east collides with a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the speed of the cars aftervcx wl/1 3;xtzf/gwq9 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 wgaw )0r290mqhy6 qqlp ith a 3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7 r9qq 0hpyqw6g) 0a2lm-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 level frictionless surface. Obbvuze i k p9fum8:*2x*tt6.o( ejijs9 ject A moves east with a momentum of 24 kgmz9x oiiu6*j :jsb 9eu.(kfv8p 2temt* /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?

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 kgc jqz5o a5peba1zns8 lkvi*l (2, b)d0, is moving toward the North with a velocity of 4.0 m/s. It explodes into three frac (8)q a elvbz*a02z,bijop d5k51 nslgments: 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.)

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 orig6v i8n-o g:ltjin, and a 10.0-kg mass sits at x = + 21.0 m. Where is ngo- l:i8t j6vthe center of mass on the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a two-particle systetkoxpvqkdlm): 2115 t m is at the origin. One particle is located at (3.0 m, 0) and has a mass of 2.0qxt :5m1 lkvto d2p1k) kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follo(v 1 seeg23rwyj,+a iaws: 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 cvrjg,s ei a+2e13wy(a enter of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located yv,;h/kod7*4qr z gtw at (0, 0), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the cg*rh od qv;4t7/,kyzwenter of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is positionedbk 3d**9d(1 cirgfq8ubp(wpy at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses being located at the oibkpcp(f *bwgd9du(1*3q y8 rrigin, (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 dif.h/pg 4ueim.; b4 sthe position of the CM of a whole leg including the foot when the leg is stretched straight out. Assume i/4 fpdm;e4hgs. .uib 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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