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

1#

What is the SI unit oplc23 9(xu 4 bvsehte5i mm3x:f momentum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball, the cannkoa0l- fd*;bnlz xp8), i l0enon 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 fr :b el+9 tib) 7v6ew9tj3atkjdictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into36jt)ekd 7v9biwtj+e a:9bl t 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 o3k kjd9/va38l,ifur jff a sled while sledding on frictionless ice. What happens to the velocity of thdij83klvf3ak ,ur/ j9 e 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 th pc xv(0gac.jk 9 ixx;x)/i/nvrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty stickscxxjcx; 0.i /9v xa)(vi/nkpg to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. How would you rep(cb ku fcp1jw40)qw rngp2 fu 33s0r;aresent its kinetic energy in terms of t wp4 k10(jag3; subw f0r)2cfr3qn pcuhese two quantities?

A. $p^2/2m$

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

C. $mp$

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

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the )hg nq-g o*n5g+)enwji* knu9kinetic energy you gave it in the previous pitch, the magnitude of its momentu*-eqjnui)g )n gn 9no *kwh5+gm is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms o.szmb 71 azgk3g)z 4gpf 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 mom-opk ld:-wew/q1p lv4 entum.

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) gr ,k4 h8vkiawz w2z;9f1lc61o u-cikma aph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accura)-d k-btoy3h:cr tg9ote 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 i xefx(.s 1cy(jcx1 rh;n a head-on collision. Which of the following statements concerning xxr h. j(1sxc;cyf(1ethe 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 an 1-c q hq4fttmh9l-zfpm6h:3 nd the other blue) are dropped from the same heigftl qmpth:nz9qc4 -61 hm3-hfht, and rebound 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, collides with a statio tmjd0txtihp*1vc; 7 7t ib0s2nary bowling ball. The Ping-Pong ball bounces back to the west, and the bowli2j0710c ihxtst;*7bpdmt vt ing 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 bounce off each other. Lin6t1s1vfv4 k8s lt tglhm,e(k ;ear 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 ur( v3x:l7mky,:b haqat 4.0 m/s. It collides head-on with a 6.0-kg object moving to the lefkh mlqab(yx3u,7r:v :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/d e;(+vpk-pqc s tackles head-on an 80-kg halfback run kq+d; -vec(ppning
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

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

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, then which op; -0id a3bndrf the following statements is tdb0;d3-air nprue about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy cof6yo*2 g2a zztd1+wz1pyd+j inserved?

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 wvlg)2 8 01i grmmti2*lvopde/hite cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. tm gdrl g0/o2pl )18eiiv2*vm The type of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

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

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling wipxad5to*ztd l -7 nibp;e3 z7-th a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collisionl p37-*x ze;pt5ddtb-i7noaz will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right collidessw+ s37uhue. a in a head-on collision with a stationary ueus7a3whs.+ 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 5.0 m/s 2vcsg6:u1*. d9qsij4eim k j8nturt 5 (d;mupcollides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the co9tgm nu mc6;e:it d2pjrj5us1 8sd*. vui 4k(qllision?

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 with a very l8nkgul8cy(klp nm:( 8 ight object at rest. The collision is elastic, and there is no friction. The heavy objecck 8 n8l(g:y(nu8kmplt barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v cof9 ypq/mjz:u m6tjx2r9uk*o.2w kuy ,llides head-on with a very heavy object at rest, in a frictionless environment. The collision is almj9/uw:zkkjo2q6ym .rpy *tm9 fxu, 2 uost perfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s colli4g kxkrnzt ru/yq:: r l+96fm 4lmt/a)des head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. Wh+ 4ym6af 4nmzk: lrr:tur)kt /xlg9q/at 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 col av. ob vo8e(grrck3 )sgso7:, yap9:dlides 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 objsd rgpo( )y:9org.ev,: o aksba78v3cect 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 conservq (d rpp;*sp tx)g/(swed, then which of the following statements is true about kinetic energyd /pqpstg (spxw);r*(?

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 togeth hy(vc+, rg(k.ry)l oser. 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. o1;or*/jjr tf It collides in a perfectly inelastic collisifrjot* /r1o j;on with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Which object:y ,da/dd/qwe experiences the larger magnitude of momentum ,de/d:/ywadq 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 and is deflected 4vwt23 upic.q9mct 4wat a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following -k2o a;85pf 1lgj-uzkhoqvy8statements is falsf--k28zgap j1oyhl;u 5ov8kq e?

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 statement)/n);u-yt5vt- e)n/c c1vnk ifv toxs ?

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 0 5/ct3b:ndhsh bm8ef flexible rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally(oqx5;gu ggg4p /vf*p, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of5gpu;4/ pgfv(ogxq* g 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 (chi x,u5 ho, glv3,cm1yx k8glevel friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about t hxgg ,1xok,3m(cch5 vyi,8 luhe 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 secon d.z;f6bxn(7zizxc z) vjv1p0d 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 truck traveling at 35 m07y,5lhgn p mj 0tqcz7 tg+l83u1y muf/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 exy11 vw;-wjv t/(m cm20 m/s. What is the magnitude of its momentum;1c(mj1txy/v we -vmw?

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 oi:88+ki dr 1 nf7nhrj d-wuq3ff 12 m. Its momentum when it strikesr88+ikwiqf dhr nd1nf -:j3u7 the ground 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. Onek pb8g8*6ybic moves with a speed of 25 m/6k8*cbpgi y8 bs due north 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 horizontals(w c,h0i v-valy at 30 m/s, strikes a wall and rebounds at 24 m/s. What is the change in the v,-0cav(swhi 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 spe(iyk)f k.zcd + r31vvjwv)9jv8x6 rp ted 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 z (w)3 +crpyvjkjx i) .v9vd6tkrfv18 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 mach/q n 6* z5m/3p .sweqnsqzrc,sine (excluding the baseball) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a spmsc.rzs6q 5 w,*s/zqp/ 3qneneed 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 spd**ff b4 *w jkc )hn4exzh09niace capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his f ehh c4b4 **nwfx)dijn* 09kz2.0-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/shv*le3s cjqv52a :yy/ 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 magnitude of the large object's momentum chayce32s:jvqa*5h v/l y nge?

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 to3 d*iaz32yn h2od3jm2v*p,ueh yw-tp greet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, wv-h* ua e yzj3dnht yd2wp3i2pm*32o,ith 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 mov6 x:u 2shdjtq-m4pqw.es to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum .4spjud26 -wqq:tmxh 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 rui6oq u b 3oloh+2se7c-ns into the rear of a stopped car that has a mass of 1500 kg and they stick together. What is the sl i6b q oc3-oh2ue7so+peed 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 coasp)m bi9p9 vguav.4ntd3 3ey)yt along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-9 bd9eyu.av py)pv4n3tim ) 3gkg 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 ne 6*f/itko4 zhd ns3r4kgligible friction 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 the car. How fast will the cars rh644k*t3nz/ kodf i 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 (with rekyt2rymq h)sf/,j z(2 5wjk+kd b /)fxspect to the log). With what speed does the log move, with respect to thwkhtd5(kzj )yxmy r+j ) f2kqfb/ /,s2e 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+noir lg iwe2;57)j mi 3.0 s on an object. The force suddenly increases to 15 N and acts for one more second. Whaoirimgw2;+n5j7 i ) let impulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s on a 6. o5+sxxh e/ /.buh2qyn0-kg object. What is the object's y/ e5xsnb2uxho. /qh+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 right at 30 mvh1r*(s8 q d-nzmf.a t/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exerts on the(f*n.tar-h18qzvm s d wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the bal m mi6d5b4 uygun hc11kd8vg(.l back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, what is the magnitude of the avm5 .6uc nui1 mkd8 d41(hgvgyberage 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 topvfb9 jj0g) 19d xrxf6u. 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 the magnitude of the average force exerted on the ball by thef19 rx xjufbj)d6v90g table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzzle velocity. r2n0i5jzs78l*.jfsy kb ojx of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted o f0 oj7.ixbkr.*yj85ns2z sl jn 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 q9owx7ui+b0z0w) jmzburning building in 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 j owzx0)bwu+0 qzm7i9 needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per minutet3o5. nvz i)yok0b6rc. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?in3cbo0yr6t )o 5v kz.

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velu h(.8 qdkkchyg0 5ug+ocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force does theuq gkhcu58 (kgh d0y+. 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 d t)y2ts52(aa zphr mjpd;e8; c duko87ys.a* in outer space. They push each other apart. What is their separation aftet(k8d8m7 p ;;s aaotusz2 )cdrpyyd5j.*2eha r 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 movee 5vw0p1i.uhh s to the right with a speed of 2.0 m/s. It collides in a perfectly elastic collvw eu15h0 pih.ision with a 6.0-kg object moving to the left at 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 velocity of 0.20 m/s in the +x direction ma8zn zb;xm5h x1kes a head-on elastic collision with az8nh 5m1xzb; x 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, td9hkjlzh*;gb8k,f .00-kg block at rest. The bulletjk 8hdlbg;* ,hfktz9, emerges (the bullet does 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-ob c -elebd* ;-icct;/rn by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If thed-;e bcb- cler *i;/ct 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 wiz2x govc0 a98t *z2f*qtc,f myth a stationary ball of mass 100 c o*0qv28ttgay zf2*xc 9z,m fg. The collision is elastic. What is the speed of each ball immediately after the collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward t 8*qkl0mw :ew2kvv6m qhe east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perv kq*68mvw2 mkqwl0e: fectly 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/m0 ) kt xa6sayug83.jvs. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the)xjy8u.6astgm 03v ka collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed of 4.3 oqox:wy kr+z v 6gp3/lo0nc+0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?yg/+kozc q3plv30+: xo6wr on

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked station c2/86y ecco5td-rmpv wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collision. Wha-v2 /oc5ce dyprmc8t6t fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direwb q)dg0f2p5/xw5(o djnud j)ction buries itself in a 2.4-kg block of wood a rest directly above it. As a result, the bullet/block combination moveqgduo/5dd j x wbw)p0(f2 n5)js vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a v4vs mp63ci 5k3000-kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (346c 5vmpvkisSee Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-kg car trn 4: pvrn*y;ntaveling at 60.0 km/h southy rn4nv pnt;*:. The two cars stick together after the collision. (See Fig. 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 east with a h7/yzfjn+ ek8 momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectl+jefh z/87y kny 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, is moving toward the North with a vvcz16u5 / ngrqp ,xn2relocity 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 rx5n 2, cpnv6g1/uzqr 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 tn *+4raij na+sz2mmb6 jq; n5ehe origin, and a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass on the x-axaa2snm+ +bjm q6rz5 ;ein* 4jnis?

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-part9** sm7zchvh9 4wx1yrc p+lzxla u3a ,icle 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 mass +avs9z9uha4z7 1 ph ,mlx*xy3l*cc rwof 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0), 2.0 ,owbbncl vvxn )-2:4 bkg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the cent -:xnlb)w nb c,ovb2v4er 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 1 c *ao u2o.hs0ctqafrky *b15kg, and 3.0 kg, are located at (0, 0), (1.0 m, 1.0 m), and (2.0 5ac h *c01a1yk uqfb.roo s*t2m, -2.0 m), respectively. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, 8.0), and a 1.0-kg mass is positioned at ( i,3.ek3jg3 aoztgv( i12, ,eog3ga33j.(k ti ivz 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 origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a whole leg inclu90pznooxn; hmbijb-3m3och sn2n.4 ,ding the foot when the leg is stretched stbnmhon0.9sm n cb ;4opinz,xj-h3 o23 raight 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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