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

1#

What is the SI unit of momentumfy8, .b(zjje h+h/ovpjvhlb 3y(w j /*?

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 can+3-ivi(y*yc8ybmt5vi w0-h qy(zqy p nonball, 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 along9 u ofyt64;abe a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is sudden;eoy9t 4aufb 6ly 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 sled while sleddin0 si(vvl nwu, mh57(o.r5ag 7rs2znt jg on frictionless ice. What happens to the velo7 hwv, svn.ru 0g275tjrnzo(l5siam(city 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 r50r.kcm w qzb.g.7xo mo -k6yequal 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 walkgb5.6o- r.xy 0qckm7 zmorw .l. 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 wilf3kn0jxqj8k9(x n (m th a momentum p. How would you represent its kinetic energy in terms of these tw 9 0fjjmqn 8kl((x3nkxo 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 twic*ab4jajz ahg5.t0p cr1 ;b: kze the kinetic energy you gave it in the previous pitch, thp z:5 k 4;tcjrzaja *ba0b1.hge 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 tekfx6 efd1x+l 0rms 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 momge5/(e7 qy 17aq fx/gtcg2g xnentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t) graph represenii+5q9 j-d koc 9i(uzxts

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an acc/* a7)awetifp:h/.;cf gd fnmurate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

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

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

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collision. Whichb6l *c)tg10mu bs9nwz7 oi7yi of the following statements concer t97 b ibuiy16cl7 )gnzwm0s*oning the magnitude of the average collision force is correct?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

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

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

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one red and the other blue) are dropped from z.g l9 aupsy 9xv(-i,gthe same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of iay,(99 vpxi. g -uzglsmpulse 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, co ,v:ebe8ulrszg(unp( 1 kni) 2llides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly(b2 pv,8r:ileek sn1)znguu( 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 bounce off each other. Linear momentus s0 a:gmg+p(,diwb (-elnh5 lm

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/ jpvj0 *r9y 1n7ofjik2 np6h;vs. It collides head-on with a 6.0-kg object moving to the len1f*0n k97r2vpjyvp ji;j oh6ft 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 pzkrt 2ue4d wy 3ac7/;cr.*mg80-kg halfback runninr7 m;ra4tg.u2e / ywk pc*z3cdg
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 th5 b dj99azvvj-e momentum is conserved, then which of the following statements is true about kin jjzv9 bv59a-detic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy consere( uvm0wxb32kns*s3 pved?

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 tl t.g7bsjdnk5)dv:7 ahe #5 ball moves away with the same velocity as the cue ball had originally. The type o b)s57.7an: vdtldjkg f 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 withckdhkl 71od25(vfj y:99l1u6 a rzkc r a heavy exercise ball at rest, the beach ball's speed after the collision will be, approxiv1ukd o l(9:j6r2y hk9 ac5frzk7l1cdmately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collides in qu78*ygj9 c (9:y+g ad+ oydhzo 8gkoca head-on collision with d9cz+oo*ud7yg:y89 o(q c 8khy+gag ja stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5yvdh 3y*t:d jy;if, 6l.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stoppj ; ddtiyf6*,hy v3y:led 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 d/f tvw s/r-9dhk pp2*with speed v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barel d/d-twvs p/h29rkp* fy slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with spee. bnph m 6)infpxe9)e7d v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of th .ppm 7be 96)xennihf)e 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 veloc h 53rnsa;e/ceity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.5;n sh/e3reac0 m/s. What is the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v collideg9bs20; rg,p2( x 3p4z p(rbiil oswbts head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light objecs,oir bt3xs(pb9lp 2 2ipw4z(r g0b;gt 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, tev*w: j)m9kz cs /r/nlhen which of the following statements is true about kinetic ene kv*r9ec: )jsz/wnl/mrgy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. Kinetic enjco1cz1k*fy y)-;tzy ergy

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 rig-kd/pi cm7u ru3(asc/ht at 4.0 m/s. It collides in a perfectly inelastic collis -ra3dip/7 mk(/cucu sion with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with rqck k5hx y+z, bl0j28w-0ucs a large object and sticks. Which object experiences the larger magnitude of momentum chansyjcbkc xr, w280hl0qk+- zu5ge?

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 and is deflectedu 0h(a lw(z9 tm6xwv4v 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 off61 v-2xxwan8 p9kq sg7 b,ooeyu2ab* the following statements is false pe9s 6 * xb7ogaauqxf-,y1n28vobwk2?

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 statemzs 9g0c1 a0ahrent?

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 flexible r6jofm ed* i-szk5)2)g5 jec vaod 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, relea fq2immvy8; tpzpz6 n8 o*:8qz(og4na ses a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of th(8z:i8v q; 4zngpqmof8 at*ypm6o2 nze 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 let ;szupt 4 -j-e*lece4vel friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What i u;s-j zpcle -4et*e4ts 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 seconyuoia r1 lp0h8 0w(;zop7r4ojd law for a system of particles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg trucb hc71 )g:(cpkns d+fnk traveling at 35 m/s?

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. What is theu36 t-(o5yc7n o bmrlq magnitude of its mom- cq( mtn ro63b7uo5ylentum?

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 4 x 4x/kvdxg.vmomentum when it strikes the gro4vvxd g.4/ xxkund is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to each other. One ml vbs;)gibb2 9/2.b ke, jvvvhoves with a speed of 25 m/s due norv. g 2, 2blisj9; vvbk)b/bhveth and the other moves at 15 m/s due east. What is the total momentum of the system?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontall vsdtf:mj3:-qf f2; yqy at 30 m/s, strikes a wall and rff :s2m;qy t3d:qf-vj ebounds at 24 m/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is str,ef 3lnqg;w j ee,7i(7pqs )otuck by a racket causing it to rebound in the opposite direction at a speed of 18 mg q f,n7ejsq)woti e7l,p ;3(e/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 (excludingjg9drb, u j4+q the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in tr+ g9dqjju ,4bhe 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 spa*l3/bg;uhbz f ce capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space zgb;3*bul fh/ 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 5.0x15rs2/:jen.dqg c lu kgm/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magnitud.x1nq esr:j 2 cl/g5ude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-xnaw4god44iqfp(bl6v. :8p asn n))b kg mass), who is standing still, with open arms. As you collide, while hwq.bbgadfo a)p4xn 84 )(ln:v4ipsn 6olding each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the rigifjwd/p e 7/6hbzv0 a*ht along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle ofj/bi6vawp/ zfd 70 e*h mass 200 kg. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear of a stopped car that haw ke.(kht,rq ydvj1y 9rv(z( 1s a mass of 1500 kg av(rk(z1dwth 9y, vkr j .1yq(end they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a + 2k)r+x yw7cqqv:all level track at a spe+xlv)kcq+2y l w:7 arqed 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?

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 7 d5 iwr7m(lx+ ucl01kztxg 7dfriction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in thi xxlcmwl 51gz+tu7dr(70 d7ke 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 m/s (no (4d(+a9cjns4,ut:lkx w 7fn1 gyhbwith respect to the log). With what speed does the log(s4+1k7:f ( wnaxhngonjdctbly4u ,9 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 fcy,tt1du gjivb+d tb+2f xp8j/g - b)-orce suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to the ob--vd b/2gb8byf tcj +jtp+ t,dig)1ux ject?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6.0-kg object. What fw:s-dt( 2g:9mn mvtl is the object'ld- (mtwgf::tvnm s9 2s change of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the r1m ptrf7e*5q cight at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on the wallmp1e* 57qftc r?

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 th1((upex 3ne nse ball back along the same path, and at th((31eu pe nxnse same 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 am ;zn, wpi-*hee8tx1 / fv(inm table top. The speeds of the ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is thfi8*z;-p tmn1nhe v em,(w xi/e 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,l3kqeuq 19ov(yg-hr tn8 0w :i fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate n( 8q-ivu l9 r ot3qh1w:gyk0eof 300 rounds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building iizmke7 yy : d0vw2)yes0 -p:9-cn yrlz9dgp*vn order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back:zywsd0 ky7pc ) md9 ie9z*e :vyr0 2gvynpl--?

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 drxhnj ;vlx ,fk 2e1w 47d*c3kpbainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, whabjlk 1xn3e 7wdh v4xfp*k2,;ct 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, achiemi,kcog gvq .o0g;.e+ves a velocity of 40 m/s after 3.0 s, when fired straight up. What averai.vgoqc,;+ okg.e m g0ge 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 re5 g-s4j qrp1ewe j1he;(dz8+.kh kpdwst in outer space. They pd whjg;k p(dws8he1rep.ej q-5+k1 4 zush each 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 th .tg5iyku o6vfa;70x me right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object moving to the left at 1.0 m/s. What is y 6vx0g; m7uat 5ofk.ithe 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 a5q5f rwx7 :kmphe7pj9 velocity of 0.20 m/s in the +x direction makes a head-on elastic collir 7ej7 h5pkmw:qxp5f 9sion with a 0.15 kg object initially at rest. What 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.29)8:i dbe4bm kkwbd m The bullet emerges (the bullet do 2dbb md4eim:9b8kkw)es not get embedded in the block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by an alpha-particle (which con8gwps)9qkm g, sists of 2 protons and 2 neutrons) moving k8p9m ,swqgg)at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the 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 wit, q,p bu do)rdw4qcd-*h a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after the collidc,uo-,rbw )qd dq4p* sion?

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 movnk ,kmug+(ce-5iowz 9f a3n4k 2qfp6n ;*u ccfing toward the east with a speed of 3.70 m/s collides head-on with a u f-cwk f6qn 2k ze*,pc539+4(nkgfci;n ouma200 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-ovqx8o- sk*2l -6f l3n drm;trtn with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is theml8nld36qtt-rsv -r2k*; x of 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 d.1 )9k9yxxsyw gr6cx4.0 m/s collides head-on in a perfectls6y 19gx9x yxrkdw. c)y inelastic collision 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 v y*he7wroi0uq r8k i nr43w41etb8 jh:elocity 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 kinetic energy is qu:r34wwe4h b*yt71n eo r hij08kri8lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s inalxu 9 ccz)0.yrys(k8 /lmx(p a vertical direction buries itself in a 2.4-kg bl0(.xc9zl/)alykp8 syumrcx ( ock of 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 traveli oynbrm cb u;cxaa-:f vn*p5)/s9am0,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 collisionm a/y5urbcpcm n v0af:-9 *a, s;x)obn. (See Fig. 7-1.) What is the speed of the cars after collision?

本题所包含的其它图片:

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 f2c;awr8kt5m aus5is o dzp-44.e nu)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 F.ksua4 - e58ota5 4sdcr2fwp;)n z miuig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

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

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

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

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

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Object A moves easzsjf+ /(0 ifc s;n7llqt with a momentum of 24 kgm/s. fnsj 7 l(cqs /z+;fli0Object 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 kg, 2qg3w xh7yyireil +:,o:lo0vis moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Nh iro +0e3 q:xol27:lwi y,gvyeglect 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 sits at x =jp1a nz p9vrw67rnjqg,+e56 r + 21.0 m. Where is the center of mass on the xppr97e nz1g6 5 + ajr6,wjrvnq-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-particlen/7u, ckjk*,vw jkgm ; 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 secj vknu,gjcm 7wk*k/,;ond 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 k 1e j gz18zqx7uht+i*ag at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center 1 17 *ghi8xuzztqja+eof 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 at (0, 0), (1.0 u7y9: gwztb xqfdbo:r ;r3 f+d6w3msj4a:ka0m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location o9 j7;ad4y+kb6rxus 33o b:wmtfazqrfg0::dw f the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is p(c sts;,hvxkk c0wk.*ositioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the sys kk.(khscvwt 0*,scx;tem 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 ob*uj.kj* iqxyap5k( : f a whole leg including the foot when the leg is stretc.b*:ijuk* pxq( 5ay kjhed straight out. Assume the person is 1.60 m tall.

本题所包含的其它图片:

A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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