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

1#

What is the SI unit of momentumx / gryf40qb6s?

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 cannonbakafh (n510tuuei6rg -ll, 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 cy)3m,jgr;0nihwi m8 )viul4j3aha(xdt r g29onstant speed. The car is open on top. A large load of coal is suddenly dumped into the car. Whx;)w2l t (4u)gmyin dramjhv0 8gj9a3rhi, i3at 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 sledh+rfd;f kk6 5e while sledding on frictionless ice. What happens tf5k dhr+ek;f6 o 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 thrown with r d lmze)y1l.8equal speed against a wall. The ball bounces back with mzlye8d 1)l.r 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 momzttt,aj,pxa+z* mw7(o2ka 0 zentum p. How would you represent its kinetic7pwaz,z *+xatjmttz ok(a2,0 energy in terms of these two quantities?

A. $p^2/2m$

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

C. $mp$

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

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the k( cmgabx16 u;:vrsnt g0 azs*8inetic energy you gave it in the previous pitch, the magnitude0gv* ga:cr1aums b xnzts6 ;8( of its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of momekfvq oy kr8.c;amuon77*4 nb8 ntum.

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 conservatv/pfor4:evi mp) qg2 /ion of momentum.

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 versuh hnbpjk861 1os time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the followinf) drq87w 0 oabiqgkh2o 5./kog 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 truck in a head-on collision. Which of the 8zacxnzg3kc;1 ,h4rq0/ xxqnfollowing statexa 0 /xn4nz3rhg8q zq,kc1; xcments concerning 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 dropprjy*+cp3osn9x s)j7pj p)q b ka)/k o:ed from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of k y)79cb3 :)j/nporjkppo )ss*xjaq +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 stationaos15wx pd+6 ytv5v.gk ry bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball p1 kg5wvy6vsd5 x.o+t 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 offydr u f -n1p6l,/dwor8 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 4.0 m/s. It collides head-tp8g5 dy7fl0q on with a 6.0-kg object moving to the left at 2.0 m/s. Which statementd0lt5yfpq87 g 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-ke*lr. wlk, b4rg halfback runnin.l,blr wk*er4 g
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 mome),+ 7xa zbr)7mzmzz xjntum is conserved, then which of the following statements is tru)zmz7 7b)x+m ajxrzz,e 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 conservw-f;ynm )mqg-1. ebyszor h *j;;eot3ed?

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*cs)abg ;(r(3g b whnngcr3(l and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type ol ;acnbrb*g(rh (g wc3s3g)(nf 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 rollin)nz 4j1niit7gftyaz n04:ja .g with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the colli zg nj.a40zt4n7ty) f1jii a:nsion 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 collid- h hv/b o,3 zw7ebw- xpz+dwz*6xlrukr 00i8les in a head-on collision with a stationary bowling ball in a friction-free environment. Il hozbb v30e -zdx* 0 rz,pw 6i-lru7+wk8x/whf 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 collides head-on elastically with an iehszid91hg) vd (i)l*ly ise .-c0pq3 dentical ball at rest. What is the speed of 03i.) ev-9*csdlpsg1i d)( hlyieq hz 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-onb hl c:):r.glq with a very light object .qb:l )hrlc:g at rest. 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 moving with speed v collides head-on with a very heavy od;m : i0 vl98uydojd1nbject at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy objec d0l uojm8dv;1:9ndyi t 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 5i*mic;xhj8q collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the veloc;ihx i8cj5mq *ity 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 collirv -vq;frv c2e8ndgx7/0i: hddes head-on with a very light object moving with velocity -v. The collision is elastic, and there is no frictioc0 vi 7v;q: -28drvrdgx/e fhnn. 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 momentum is conser**l msys v1u) 7zmrcdpg776ezved, then which of the following statements is *zec7*6pym rz gl7sd71msuv) true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick toget+aes .p )+: :+axjfty v-yubjsher. 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 rr a -a**dcm lb1;n6n9l j6rriright at 4.0 m/s. It collides in a perfectly inelastic collision withanr*l1jrmb rli69*-r;cd6 an 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 x5fnz kg1 u13gt( 3i.ne f8dascs7v2lexperiences the largera s(k 11u nve 3f ngizl2cxdt73sf5.8g magnitude of momentum change?

A. the large object

B. the small object

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

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball,3;veri + pc5.;8;rgur) kaf(h uuw3ev wr gil and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of h(uja;x+ sn r.the following statements is falsesjr(.xan+u h;?

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?6zs l(c6if hh:t ,y. ezouv7.v

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 flex1j qc-(ydu +jwsjd k+- tf69ppible 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, rk ra* 44.ruhmwhich explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after .hkmru*r4 4arthe 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 frivkz mc,vhpj ua +.q;a:)6p(so n-/4bn:rzvvqction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's ce +6zkhzn -p:a4c:v ao)svm (. b;rpunqvqj,/vnter 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 fo6bsa3y+u 3visx0xs 0 28issbu r 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 mmjh ia:zguht *,0m.eta2x2 i-/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 the magnitu(f v zfyw-gpux5u0 9 3din (towoz01i/de of its momeit5 yn i(zuf0xfp10 3 zo /g(u9owd-vwntum?

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.h ppo1lc2m 0l heo a6+t3fa9mpa7xq *9 Its momentum when it s 3lmahfoqate p l9o 76pc2xam+1p9*h0trikes 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 aredkn5- mayk: -z moving perpendicular to each other. One moves with a speed of 25 m/s zd- k:-akymn 5due 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 horizontally at 30 m/s, strikes a wa3av1kx8 k:o ;,j emzxxll and rebounds o, 1xx mx38k;aj:vzek 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, initilw /kr2si9uq9hm /0e q/h rpo4ally moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the op9hm/e o94kqwrsqlu/ipr 2/h0posite 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 basebafk5oc 1buo-/3b+u5etbc6 n woll) is placed on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the rektc65bw bo1 3e-ouu/+nc 5 obfcoil 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 anck16p*qt/o .uk*clhv 4 jup0sd is stationary when the tether line breaks. As a means of returning to the capsule he throws h.l/* tq vu ck0pk16hc4osu *jpis 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 hekr .xdzg(, 5dv -pl(xrad-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 chanvxlx-dr ,d (zkg5r(p.ge?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on ice at 4.0 m/s to greet your friend (40-kg mass), v. hzoe(lcd23 who is standing still, with open arms. As you collide, while holding each other, with what speed do you bo.3 2colhd ev(zth 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 right along a level, straight road at iq22l2e+7 .cjtfb3t )kgm f ljai.:f oomc1 a1a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the .1)qoitl t 2 a 2 7e3igocf2f1b.f+mljcak:mj 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 reaze /lr ohzw;bn;8v-9ln+c)+.9b catmd j4 tuhr of a stopped car that has a mass of 1500 kg and they stick together. What ih;;zon )z-.vlj4babc9newtt h dc/ 9m lr8 +u+s 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 al:9f;l;l-b r9 yzxj nbylowed to coast along a level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released.y:ll9;r; xz fyjbn9-b 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, ppy10g 0kh w+t+pgl(+mdt *ca rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg st py1pka0w*0tp t (ldg+ hcm+g+unt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens?

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-kxy5 9v8:v jvivg log at the rate of 0.80 m/s (with respect to the log). With what speed does the log move, with respect to thy9v ijxv5:v 8ve 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 15 N.* -/jgdvp 4ubcp y/kv and acts for one more second. What impulse was imparted by these forces to the og/ vcvb- u*dp/ pjk.y4bject?

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 is t,9vl hsssdgu0qk:d)3 he object's cha3:s9 qsg kddu0)l vs,hnge 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 m/s, collides with a zz.l4n kfd/5uczz;ekr l(gw , x+xg;0 brick wall and comes to rest in 0.20 s. What is the average force t+;z zdf;xw(rkcku0/z4nlegzl g,5 x .he 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 taa-fo l- g/2tdo you at 20 m/s. You hit the ball back along the same path, and at the sfo- ldag/-at2 ame 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 on8l/u dfc8 vh+,bnl kq*f5dn8uto a table top. The speeds of the ball right before and rigu,k /cul+qddh*v8n f8 n5f8bl ht 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 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-g0tx 5q 9ogsvp;ram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the machine gun mvg9;t5 sxq 0poount?

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 :m.,w:xb kg-ywpg f0z h vf+htaqm(*b1lq (/gto 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 sxlktq:vbbq*m:.fmgp-a w(w(1 h g0 fzyg,/h+tream 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 hou n pi,2g.yk. wid8dw5rizontal drainpipe at the rate of 120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't .u5ip.ywk 2wgdni8d, splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity of 40 m/s after 3.0 s,-fbwg4r 2cq m )socmc:p*n32m when fired straight up. What average thrust force does the rocket engine egwmmfs3-2nc2c4c ro*:pb ) mqxert?

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 ou+0 d.,h,-/ vyga itl:: lnhwwhthzc3u ter space. They push each i+y hv:/d.,h:w n,hc t03glh -ulazwtother 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 speed of 2c:00iw:ug1pt9k )nzpv t isd:pfo6*d .0 m/s. It collides in a perfectly elastic collision with a 6.0-kg )9zus:w 0i*pn gitc 6kd1:po f :pdv0tobject 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 velockx 0.psppbu2:njc- ( eity 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 velo(u c:pbxe. jpsp-2n 0kcity 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. Th*) hl ms,+x/vr*e vvyge bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is v vg+vl*ryse*,m )/hx 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-particlpkga:of (4g :brcmo mj +s:-0se (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is com:kmog s fpmg :-(+osc4rba0:jpletely 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 colrqkggyj ;(hvtd3:(e7lides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed ofetg:v(ydghq(3jkr 7 ; 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 tow9x,n ju 7uv0j,bf* q; tdxk3izard the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. Thz*fu x0 n9,xj7;tbjqu v,i3dk e 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 r)u+y5fvd 8 cldcff(,-psmjra pk-7:m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastjfkd8f 5s)mpv -r,+:clp7 -( dyrc afuic, 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 the east at a speed of t2 :c,on 3z*bq(6xx-e prj ibt4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. etpbqinxc6rz3:2t*(j ox -,b 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 iiel5,+/xvv zys)t)te pe s09a velocity v, strikes a parked station wagon, who's mass is 2m. The/9 tv5i)y)p,e 0 tsxv+isz eel bumpers lock together in this head-on inelastic collision. What 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 travel6rufs.pn, /q a7 ;*nvpikue5h ing 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 combinatp ,.qup 6i/e*rsf;khu7 a5 nvnion moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-,+czywsdkb)tpnwii )gw0w(,.1 x g:j kg car traveling at 60.0 km/h south. The two cars stick together aft( w.,,wdxw)ykg)c1 itgzsb+ j 0n piw:er the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.j j3y0prv+k.s 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 directionpy.jrjs30 kv+ 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 frictionemxkvm jen/cl36d/6 57 fcmm.less surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. Wha m5exme6j3 m/vnc 7k6/lm.dc ft 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 velocity oon kh y6w2)cq,f 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 veloch6)2nkcw y,oq ity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sij od2o8;p xzh ntm1;1sts at x = + 21.0 m. Where is the center of mass on tt 8mdo 1j;osp;zh 21nxhe 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 u-:jxry0/2fq;f yovr, j/sux c+y- mz two-particle system is at the origin. One particle is located at (3.0 m, 0) and has,ru -y;0fmj: /-uxyzv2/rjy ocqf+ xs a mass of 2.0 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 follows: 2.0 kg at (0, 0), 2.0 kg at (2.i2 xi d58 dmjl(3l/axt0, 0), and 4.0 kg 8/ m laid23( jdx5ixtlat (2.0, 1.0). Determine the coordinates of the center 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 at (0, 0), (5a+i 1bfinzmsrx ;p2+/dul( 9fpvc r31.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the cente+an +d39x5urm2p z lriipffb1s cv(/;r 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, 8.9 ixat woh9e/r1z u3d60), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass wrei91ahu/6o3tz9w dx hich 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 includin trjwcd1t2 i-/vfp*/lk 2 dsn:g the foot when the leg is stretched straight out. Assume the personpnil t21r/j:d c dw-tfs /vk2* 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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